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authorLinus Torvalds <torvalds@linux-foundation.org>2015-11-05 16:26:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-05 16:26:26 -0800
commit933425fb0010bd02bd459b41e63082756818ffce (patch)
tree1cbc6c2035b9dcff8cb265c9ac562cbee7c6bb82 /virt
parenta3e7531535a0c6e5acbaa5436f37933bb471aa95 (diff)
parenta3eaa8649e4c6a6afdafaa04b9114fb230617bb1 (diff)
downloadlinux-linaro-stable-933425fb0010bd02bd459b41e63082756818ffce.tar.gz
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM updates from Paolo Bonzini: "First batch of KVM changes for 4.4. s390: A bunch of fixes and optimizations for interrupt and time handling. PPC: Mostly bug fixes. ARM: No big features, but many small fixes and prerequisites including: - a number of fixes for the arch-timer - introducing proper level-triggered semantics for the arch-timers - a series of patches to synchronously halt a guest (prerequisite for IRQ forwarding) - some tracepoint improvements - a tweak for the EL2 panic handlers - some more VGIC cleanups getting rid of redundant state x86: Quite a few changes: - support for VT-d posted interrupts (i.e. PCI devices can inject interrupts directly into vCPUs). This introduces a new component (in virt/lib/) that connects VFIO and KVM together. The same infrastructure will be used for ARM interrupt forwarding as well. - more Hyper-V features, though the main one Hyper-V synthetic interrupt controller will have to wait for 4.5. These will let KVM expose Hyper-V devices. - nested virtualization now supports VPID (same as PCID but for vCPUs) which makes it quite a bit faster - for future hardware that supports NVDIMM, there is support for clflushopt, clwb, pcommit - support for "split irqchip", i.e. LAPIC in kernel + IOAPIC/PIC/PIT in userspace, which reduces the attack surface of the hypervisor - obligatory smattering of SMM fixes - on the guest side, stable scheduler clock support was rewritten to not require help from the hypervisor" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (123 commits) KVM: VMX: Fix commit which broke PML KVM: x86: obey KVM_X86_QUIRK_CD_NW_CLEARED in kvm_set_cr0() KVM: x86: allow RSM from 64-bit mode KVM: VMX: fix SMEP and SMAP without EPT KVM: x86: move kvm_set_irq_inatomic to legacy device assignment KVM: device assignment: remove pointless #ifdefs KVM: x86: merge kvm_arch_set_irq with kvm_set_msi_inatomic KVM: x86: zero apic_arb_prio on reset drivers/hv: share Hyper-V SynIC constants with userspace KVM: x86: handle SMBASE as physical address in RSM KVM: x86: add read_phys to x86_emulate_ops KVM: x86: removing unused variable KVM: don't pointlessly leave KVM_COMPAT=y in non-KVM configs KVM: arm/arm64: Merge vgic_set_lr() and vgic_sync_lr_elrsr() KVM: arm/arm64: Clean up vgic_retire_lr() and surroundings KVM: arm/arm64: Optimize away redundant LR tracking KVM: s390: use simple switch statement as multiplexer KVM: s390: drop useless newline in debugging data KVM: s390: SCA must not cross page boundaries KVM: arm: Do not indent the arguments of DECLARE_BITMAP ...
Diffstat (limited to 'virt')
-rw-r--r--virt/Makefile1
-rw-r--r--virt/kvm/Kconfig5
-rw-r--r--virt/kvm/arm/arch_timer.c173
-rw-r--r--virt/kvm/arm/trace.h63
-rw-r--r--virt/kvm/arm/vgic-v2.c6
-rw-r--r--virt/kvm/arm/vgic-v3.c6
-rw-r--r--virt/kvm/arm/vgic.c308
-rw-r--r--virt/kvm/async_pf.c4
-rw-r--r--virt/kvm/eventfd.c190
-rw-r--r--virt/kvm/irqchip.c18
-rw-r--r--virt/kvm/kvm_main.c11
-rw-r--r--virt/lib/Kconfig2
-rw-r--r--virt/lib/Makefile1
-rw-r--r--virt/lib/irqbypass.c257
14 files changed, 681 insertions, 364 deletions
diff --git a/virt/Makefile b/virt/Makefile
new file mode 100644
index 000000000000..be783472ac81
--- /dev/null
+++ b/virt/Makefile
@@ -0,0 +1 @@
+obj-y += lib/
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index e2c876d5a03b..7a79b6853583 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -46,4 +46,7 @@ config KVM_GENERIC_DIRTYLOG_READ_PROTECT
config KVM_COMPAT
def_bool y
- depends on COMPAT && !S390
+ depends on KVM && COMPAT && !S390
+
+config HAVE_KVM_IRQ_BYPASS
+ bool
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index b9d3a32cbc04..21a0ab2d8919 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -28,6 +28,8 @@
#include <kvm/arm_vgic.h>
#include <kvm/arm_arch_timer.h>
+#include "trace.h"
+
static struct timecounter *timecounter;
static struct workqueue_struct *wqueue;
static unsigned int host_vtimer_irq;
@@ -59,18 +61,6 @@ static void timer_disarm(struct arch_timer_cpu *timer)
}
}
-static void kvm_timer_inject_irq(struct kvm_vcpu *vcpu)
-{
- int ret;
- struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
-
- kvm_vgic_set_phys_irq_active(timer->map, true);
- ret = kvm_vgic_inject_mapped_irq(vcpu->kvm, vcpu->vcpu_id,
- timer->map,
- timer->irq->level);
- WARN_ON(ret);
-}
-
static irqreturn_t kvm_arch_timer_handler(int irq, void *dev_id)
{
struct kvm_vcpu *vcpu = *(struct kvm_vcpu **)dev_id;
@@ -111,14 +101,20 @@ static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt)
return HRTIMER_NORESTART;
}
+static bool kvm_timer_irq_can_fire(struct kvm_vcpu *vcpu)
+{
+ struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+
+ return !(timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) &&
+ (timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE);
+}
+
bool kvm_timer_should_fire(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
cycle_t cval, now;
- if ((timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) ||
- !(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE) ||
- kvm_vgic_get_phys_irq_active(timer->map))
+ if (!kvm_timer_irq_can_fire(vcpu))
return false;
cval = timer->cntv_cval;
@@ -127,12 +123,94 @@ bool kvm_timer_should_fire(struct kvm_vcpu *vcpu)
return cval <= now;
}
+static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level)
+{
+ int ret;
+ struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+
+ BUG_ON(!vgic_initialized(vcpu->kvm));
+
+ timer->irq.level = new_level;
+ trace_kvm_timer_update_irq(vcpu->vcpu_id, timer->map->virt_irq,
+ timer->irq.level);
+ ret = kvm_vgic_inject_mapped_irq(vcpu->kvm, vcpu->vcpu_id,
+ timer->map,
+ timer->irq.level);
+ WARN_ON(ret);
+}
+
+/*
+ * Check if there was a change in the timer state (should we raise or lower
+ * the line level to the GIC).
+ */
+static void kvm_timer_update_state(struct kvm_vcpu *vcpu)
+{
+ struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+
+ /*
+ * If userspace modified the timer registers via SET_ONE_REG before
+ * the vgic was initialized, we mustn't set the timer->irq.level value
+ * because the guest would never see the interrupt. Instead wait
+ * until we call this function from kvm_timer_flush_hwstate.
+ */
+ if (!vgic_initialized(vcpu->kvm))
+ return;
+
+ if (kvm_timer_should_fire(vcpu) != timer->irq.level)
+ kvm_timer_update_irq(vcpu, !timer->irq.level);
+}
+
+/*
+ * Schedule the background timer before calling kvm_vcpu_block, so that this
+ * thread is removed from its waitqueue and made runnable when there's a timer
+ * interrupt to handle.
+ */
+void kvm_timer_schedule(struct kvm_vcpu *vcpu)
+{
+ struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+ u64 ns;
+ cycle_t cval, now;
+
+ BUG_ON(timer_is_armed(timer));
+
+ /*
+ * No need to schedule a background timer if the guest timer has
+ * already expired, because kvm_vcpu_block will return before putting
+ * the thread to sleep.
+ */
+ if (kvm_timer_should_fire(vcpu))
+ return;
+
+ /*
+ * If the timer is not capable of raising interrupts (disabled or
+ * masked), then there's no more work for us to do.
+ */
+ if (!kvm_timer_irq_can_fire(vcpu))
+ return;
+
+ /* The timer has not yet expired, schedule a background timer */
+ cval = timer->cntv_cval;
+ now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff;
+
+ ns = cyclecounter_cyc2ns(timecounter->cc,
+ cval - now,
+ timecounter->mask,
+ &timecounter->frac);
+ timer_arm(timer, ns);
+}
+
+void kvm_timer_unschedule(struct kvm_vcpu *vcpu)
+{
+ struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+ timer_disarm(timer);
+}
+
/**
* kvm_timer_flush_hwstate - prepare to move the virt timer to the cpu
* @vcpu: The vcpu pointer
*
- * Disarm any pending soft timers, since the world-switch code will write the
- * virtual timer state back to the physical CPU.
+ * Check if the virtual timer has expired while we were running in the host,
+ * and inject an interrupt if that was the case.
*/
void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
{
@@ -140,28 +218,20 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
bool phys_active;
int ret;
- /*
- * We're about to run this vcpu again, so there is no need to
- * keep the background timer running, as we're about to
- * populate the CPU timer again.
- */
- timer_disarm(timer);
+ kvm_timer_update_state(vcpu);
/*
- * If the timer expired while we were not scheduled, now is the time
- * to inject it.
+ * If we enter the guest with the virtual input level to the VGIC
+ * asserted, then we have already told the VGIC what we need to, and
+ * we don't need to exit from the guest until the guest deactivates
+ * the already injected interrupt, so therefore we should set the
+ * hardware active state to prevent unnecessary exits from the guest.
+ *
+ * Conversely, if the virtual input level is deasserted, then always
+ * clear the hardware active state to ensure that hardware interrupts
+ * from the timer triggers a guest exit.
*/
- if (kvm_timer_should_fire(vcpu))
- kvm_timer_inject_irq(vcpu);
-
- /*
- * We keep track of whether the edge-triggered interrupt has been
- * signalled to the vgic/guest, and if so, we mask the interrupt and
- * the physical distributor to prevent the timer from raising a
- * physical interrupt whenever we run a guest, preventing forward
- * VCPU progress.
- */
- if (kvm_vgic_get_phys_irq_active(timer->map))
+ if (timer->irq.level)
phys_active = true;
else
phys_active = false;
@@ -176,32 +246,20 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
* kvm_timer_sync_hwstate - sync timer state from cpu
* @vcpu: The vcpu pointer
*
- * Check if the virtual timer was armed and either schedule a corresponding
- * soft timer or inject directly if already expired.
+ * Check if the virtual timer has expired while we were running in the guest,
+ * and inject an interrupt if that was the case.
*/
void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
- cycle_t cval, now;
- u64 ns;
BUG_ON(timer_is_armed(timer));
- if (kvm_timer_should_fire(vcpu)) {
- /*
- * Timer has already expired while we were not
- * looking. Inject the interrupt and carry on.
- */
- kvm_timer_inject_irq(vcpu);
- return;
- }
-
- cval = timer->cntv_cval;
- now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff;
-
- ns = cyclecounter_cyc2ns(timecounter->cc, cval - now, timecounter->mask,
- &timecounter->frac);
- timer_arm(timer, ns);
+ /*
+ * The guest could have modified the timer registers or the timer
+ * could have expired, update the timer state.
+ */
+ kvm_timer_update_state(vcpu);
}
int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
@@ -216,7 +274,7 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
* kvm_vcpu_set_target(). To handle this, we determine
* vcpu timer irq number when the vcpu is reset.
*/
- timer->irq = irq;
+ timer->irq.irq = irq->irq;
/*
* The bits in CNTV_CTL are architecturally reset to UNKNOWN for ARMv8
@@ -225,6 +283,7 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
* the ARMv7 architecture.
*/
timer->cntv_ctl = 0;
+ kvm_timer_update_state(vcpu);
/*
* Tell the VGIC that the virtual interrupt is tied to a
@@ -269,6 +328,8 @@ int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
default:
return -1;
}
+
+ kvm_timer_update_state(vcpu);
return 0;
}
diff --git a/virt/kvm/arm/trace.h b/virt/kvm/arm/trace.h
new file mode 100644
index 000000000000..37d8b98867d5
--- /dev/null
+++ b/virt/kvm/arm/trace.h
@@ -0,0 +1,63 @@
+#if !defined(_TRACE_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_KVM_H
+
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM kvm
+
+/*
+ * Tracepoints for vgic
+ */
+TRACE_EVENT(vgic_update_irq_pending,
+ TP_PROTO(unsigned long vcpu_id, __u32 irq, bool level),
+ TP_ARGS(vcpu_id, irq, level),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, vcpu_id )
+ __field( __u32, irq )
+ __field( bool, level )
+ ),
+
+ TP_fast_assign(
+ __entry->vcpu_id = vcpu_id;
+ __entry->irq = irq;
+ __entry->level = level;
+ ),
+
+ TP_printk("VCPU: %ld, IRQ %d, level: %d",
+ __entry->vcpu_id, __entry->irq, __entry->level)
+);
+
+/*
+ * Tracepoints for arch_timer
+ */
+TRACE_EVENT(kvm_timer_update_irq,
+ TP_PROTO(unsigned long vcpu_id, __u32 irq, int level),
+ TP_ARGS(vcpu_id, irq, level),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, vcpu_id )
+ __field( __u32, irq )
+ __field( int, level )
+ ),
+
+ TP_fast_assign(
+ __entry->vcpu_id = vcpu_id;
+ __entry->irq = irq;
+ __entry->level = level;
+ ),
+
+ TP_printk("VCPU: %ld, IRQ %d, level %d",
+ __entry->vcpu_id, __entry->irq, __entry->level)
+);
+
+#endif /* _TRACE_KVM_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH ../../../virt/kvm/arm
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/virt/kvm/arm/vgic-v2.c b/virt/kvm/arm/vgic-v2.c
index 8d7b04db8471..ff02f08df74d 100644
--- a/virt/kvm/arm/vgic-v2.c
+++ b/virt/kvm/arm/vgic-v2.c
@@ -79,11 +79,7 @@ static void vgic_v2_set_lr(struct kvm_vcpu *vcpu, int lr,
lr_val |= (lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT);
vcpu->arch.vgic_cpu.vgic_v2.vgic_lr[lr] = lr_val;
-}
-static void vgic_v2_sync_lr_elrsr(struct kvm_vcpu *vcpu, int lr,
- struct vgic_lr lr_desc)
-{
if (!(lr_desc.state & LR_STATE_MASK))
vcpu->arch.vgic_cpu.vgic_v2.vgic_elrsr |= (1ULL << lr);
else
@@ -158,6 +154,7 @@ static void vgic_v2_enable(struct kvm_vcpu *vcpu)
* anyway.
*/
vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr = 0;
+ vcpu->arch.vgic_cpu.vgic_v2.vgic_elrsr = ~0;
/* Get the show on the road... */
vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr = GICH_HCR_EN;
@@ -166,7 +163,6 @@ static void vgic_v2_enable(struct kvm_vcpu *vcpu)
static const struct vgic_ops vgic_v2_ops = {
.get_lr = vgic_v2_get_lr,
.set_lr = vgic_v2_set_lr,
- .sync_lr_elrsr = vgic_v2_sync_lr_elrsr,
.get_elrsr = vgic_v2_get_elrsr,
.get_eisr = vgic_v2_get_eisr,
.clear_eisr = vgic_v2_clear_eisr,
diff --git a/virt/kvm/arm/vgic-v3.c b/virt/kvm/arm/vgic-v3.c
index 7dd5d62f10a1..487d6357b7e7 100644
--- a/virt/kvm/arm/vgic-v3.c
+++ b/virt/kvm/arm/vgic-v3.c
@@ -112,11 +112,7 @@ static void vgic_v3_set_lr(struct kvm_vcpu *vcpu, int lr,
}
vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[LR_INDEX(lr)] = lr_val;
-}
-static void vgic_v3_sync_lr_elrsr(struct kvm_vcpu *vcpu, int lr,
- struct vgic_lr lr_desc)
-{
if (!(lr_desc.state & LR_STATE_MASK))
vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr |= (1U << lr);
else
@@ -193,6 +189,7 @@ static void vgic_v3_enable(struct kvm_vcpu *vcpu)
* anyway.
*/
vgic_v3->vgic_vmcr = 0;
+ vgic_v3->vgic_elrsr = ~0;
/*
* If we are emulating a GICv3, we do it in an non-GICv2-compatible
@@ -211,7 +208,6 @@ static void vgic_v3_enable(struct kvm_vcpu *vcpu)
static const struct vgic_ops vgic_v3_ops = {
.get_lr = vgic_v3_get_lr,
.set_lr = vgic_v3_set_lr,
- .sync_lr_elrsr = vgic_v3_sync_lr_elrsr,
.get_elrsr = vgic_v3_get_elrsr,
.get_eisr = vgic_v3_get_eisr,
.clear_eisr = vgic_v3_clear_eisr,
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 30489181922d..533538385d5d 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -34,6 +34,9 @@
#include <asm/kvm.h>
#include <kvm/iodev.h>
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
/*
* How the whole thing works (courtesy of Christoffer Dall):
*
@@ -102,11 +105,13 @@
#include "vgic.h"
static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu);
-static void vgic_retire_lr(int lr_nr, int irq, struct kvm_vcpu *vcpu);
+static void vgic_retire_lr(int lr_nr, struct kvm_vcpu *vcpu);
static struct vgic_lr vgic_get_lr(const struct kvm_vcpu *vcpu, int lr);
static void vgic_set_lr(struct kvm_vcpu *vcpu, int lr, struct vgic_lr lr_desc);
+static u64 vgic_get_elrsr(struct kvm_vcpu *vcpu);
static struct irq_phys_map *vgic_irq_map_search(struct kvm_vcpu *vcpu,
int virt_irq);
+static int compute_pending_for_cpu(struct kvm_vcpu *vcpu);
static const struct vgic_ops *vgic_ops;
static const struct vgic_params *vgic;
@@ -357,6 +362,11 @@ static void vgic_dist_irq_clear_soft_pend(struct kvm_vcpu *vcpu, int irq)
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
vgic_bitmap_set_irq_val(&dist->irq_soft_pend, vcpu->vcpu_id, irq, 0);
+ if (!vgic_dist_irq_get_level(vcpu, irq)) {
+ vgic_dist_irq_clear_pending(vcpu, irq);
+ if (!compute_pending_for_cpu(vcpu))
+ clear_bit(vcpu->vcpu_id, dist->irq_pending_on_cpu);
+ }
}
static int vgic_dist_irq_is_pending(struct kvm_vcpu *vcpu, int irq)
@@ -531,34 +541,6 @@ bool vgic_handle_set_pending_reg(struct kvm *kvm,
return false;
}
-/*
- * If a mapped interrupt's state has been modified by the guest such that it
- * is no longer active or pending, without it have gone through the sync path,
- * then the map->active field must be cleared so the interrupt can be taken
- * again.
- */
-static void vgic_handle_clear_mapped_irq(struct kvm_vcpu *vcpu)
-{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
- struct list_head *root;
- struct irq_phys_map_entry *entry;
- struct irq_phys_map *map;
-
- rcu_read_lock();
-
- /* Check for PPIs */
- root = &vgic_cpu->irq_phys_map_list;
- list_for_each_entry_rcu(entry, root, entry) {
- map = &entry->map;
-
- if (!vgic_dist_irq_is_pending(vcpu, map->virt_irq) &&
- !vgic_irq_is_active(vcpu, map->virt_irq))
- map->active = false;
- }
-
- rcu_read_unlock();
-}
-
bool vgic_handle_clear_pending_reg(struct kvm *kvm,
struct kvm_exit_mmio *mmio,
phys_addr_t offset, int vcpu_id)
@@ -589,7 +571,6 @@ bool vgic_handle_clear_pending_reg(struct kvm *kvm,
vcpu_id, offset);
vgic_reg_access(mmio, reg, offset, mode);
- vgic_handle_clear_mapped_irq(kvm_get_vcpu(kvm, vcpu_id));
vgic_update_state(kvm);
return true;
}
@@ -627,7 +608,6 @@ bool vgic_handle_clear_active_reg(struct kvm *kvm,
ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT);
if (mmio->is_write) {
- vgic_handle_clear_mapped_irq(kvm_get_vcpu(kvm, vcpu_id));
vgic_update_state(kvm);
return true;
}
@@ -684,10 +664,9 @@ bool vgic_handle_cfg_reg(u32 *reg, struct kvm_exit_mmio *mmio,
vgic_reg_access(mmio, &val, offset,
ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
if (mmio->is_write) {
- if (offset < 8) {
- *reg = ~0U; /* Force PPIs/SGIs to 1 */
+ /* Ignore writes to read-only SGI and PPI bits */
+ if (offset < 8)
return false;
- }
val = vgic_cfg_compress(val);
if (offset & 4) {
@@ -713,9 +692,11 @@ bool vgic_handle_cfg_reg(u32 *reg, struct kvm_exit_mmio *mmio,
void vgic_unqueue_irqs(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+ u64 elrsr = vgic_get_elrsr(vcpu);
+ unsigned long *elrsr_ptr = u64_to_bitmask(&elrsr);
int i;
- for_each_set_bit(i, vgic_cpu->lr_used, vgic_cpu->nr_lr) {
+ for_each_clear_bit(i, elrsr_ptr, vgic_cpu->nr_lr) {
struct vgic_lr lr = vgic_get_lr(vcpu, i);
/*
@@ -736,30 +717,14 @@ void vgic_unqueue_irqs(struct kvm_vcpu *vcpu)
* interrupt then move the active state to the
* distributor tracking bit.
*/
- if (lr.state & LR_STATE_ACTIVE) {
+ if (lr.state & LR_STATE_ACTIVE)
vgic_irq_set_active(vcpu, lr.irq);
- lr.state &= ~LR_STATE_ACTIVE;
- }
/*
* Reestablish the pending state on the distributor and the
- * CPU interface. It may have already been pending, but that
- * is fine, then we are only setting a few bits that were
- * already set.
+ * CPU interface and mark the LR as free for other use.
*/
- if (lr.state & LR_STATE_PENDING) {
- vgic_dist_irq_set_pending(vcpu, lr.irq);
- lr.state &= ~LR_STATE_PENDING;
- }
-
- vgic_set_lr(vcpu, i, lr);
-
- /*
- * Mark the LR as free for other use.
- */
- BUG_ON(lr.state & LR_STATE_MASK);
- vgic_retire_lr(i, lr.irq, vcpu);
- vgic_irq_clear_queued(vcpu, lr.irq);
+ vgic_retire_lr(i, vcpu);
/* Finally update the VGIC state. */
vgic_update_state(vcpu->kvm);
@@ -1067,12 +1032,6 @@ static void vgic_set_lr(struct kvm_vcpu *vcpu, int lr,
vgic_ops->set_lr(vcpu, lr, vlr);
}
-static void vgic_sync_lr_elrsr(struct kvm_vcpu *vcpu, int lr,
- struct vgic_lr vlr)
-{
- vgic_ops->sync_lr_elrsr(vcpu, lr, vlr);
-}
-
static inline u64 vgic_get_elrsr(struct kvm_vcpu *vcpu)
{
return vgic_ops->get_elrsr(vcpu);
@@ -1118,25 +1077,23 @@ static inline void vgic_enable(struct kvm_vcpu *vcpu)
vgic_ops->enable(vcpu);
}
-static void vgic_retire_lr(int lr_nr, int irq, struct kvm_vcpu *vcpu)
+static void vgic_retire_lr(int lr_nr, struct kvm_vcpu *vcpu)
{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
struct vgic_lr vlr = vgic_get_lr(vcpu, lr_nr);
+ vgic_irq_clear_queued(vcpu, vlr.irq);
+
/*
* We must transfer the pending state back to the distributor before
* retiring the LR, otherwise we may loose edge-triggered interrupts.
*/
if (vlr.state & LR_STATE_PENDING) {
- vgic_dist_irq_set_pending(vcpu, irq);
+ vgic_dist_irq_set_pending(vcpu, vlr.irq);
vlr.hwirq = 0;
}
vlr.state = 0;
vgic_set_lr(vcpu, lr_nr, vlr);
- clear_bit(lr_nr, vgic_cpu->lr_used);
- vgic_cpu->vgic_irq_lr_map[irq] = LR_EMPTY;
- vgic_sync_lr_elrsr(vcpu, lr_nr, vlr);
}
/*
@@ -1150,17 +1107,15 @@ static void vgic_retire_lr(int lr_nr, int irq, struct kvm_vcpu *vcpu)
*/
static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu)
{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+ u64 elrsr = vgic_get_elrsr(vcpu);
+ unsigned long *elrsr_ptr = u64_to_bitmask(&elrsr);
int lr;
- for_each_set_bit(lr, vgic_cpu->lr_used, vgic->nr_lr) {
+ for_each_clear_bit(lr, elrsr_ptr, vgic->nr_lr) {
struct vgic_lr vlr = vgic_get_lr(vcpu, lr);
- if (!vgic_irq_is_enabled(vcpu, vlr.irq)) {
- vgic_retire_lr(lr, vlr.irq, vcpu);
- if (vgic_irq_is_queued(vcpu, vlr.irq))
- vgic_irq_clear_queued(vcpu, vlr.irq);
- }
+ if (!vgic_irq_is_enabled(vcpu, vlr.irq))
+ vgic_retire_lr(lr, vcpu);
}
}
@@ -1200,7 +1155,6 @@ static void vgic_queue_irq_to_lr(struct kvm_vcpu *vcpu, int irq,
}
vgic_set_lr(vcpu, lr_nr, vlr);
- vgic_sync_lr_elrsr(vcpu, lr_nr, vlr);
}
/*
@@ -1210,8 +1164,9 @@ static void vgic_queue_irq_to_lr(struct kvm_vcpu *vcpu, int irq,
*/
bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq)
{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+ u64 elrsr = vgic_get_elrsr(vcpu);
+ unsigned long *elrsr_ptr = u64_to_bitmask(&elrsr);
struct vgic_lr vlr;
int lr;
@@ -1222,28 +1177,22 @@ bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq)
kvm_debug("Queue IRQ%d\n", irq);
- lr = vgic_cpu->vgic_irq_lr_map[irq];
-
/* Do we have an active interrupt for the same CPUID? */
- if (lr != LR_EMPTY) {
+ for_each_clear_bit(lr, elrsr_ptr, vgic->nr_lr) {
vlr = vgic_get_lr(vcpu, lr);
- if (vlr.source == sgi_source_id) {
+ if (vlr.irq == irq && vlr.source == sgi_source_id) {
kvm_debug("LR%d piggyback for IRQ%d\n", lr, vlr.irq);
- BUG_ON(!test_bit(lr, vgic_cpu->lr_used));
vgic_queue_irq_to_lr(vcpu, irq, lr, vlr);
return true;
}
}
/* Try to use another LR for this interrupt */
- lr = find_first_zero_bit((unsigned long *)vgic_cpu->lr_used,
- vgic->nr_lr);
+ lr = find_first_bit(elrsr_ptr, vgic->nr_lr);
if (lr >= vgic->nr_lr)
return false;
kvm_debug("LR%d allocated for IRQ%d %x\n", lr, irq, sgi_source_id);
- vgic_cpu->vgic_irq_lr_map[irq] = lr;
- set_bit(lr, vgic_cpu->lr_used);
vlr.irq = irq;
vlr.source = sgi_source_id;
@@ -1338,12 +1287,60 @@ epilog:
}
}
+static int process_queued_irq(struct kvm_vcpu *vcpu,
+ int lr, struct vgic_lr vlr)
+{
+ int pending = 0;
+
+ /*
+ * If the IRQ was EOIed (called from vgic_process_maintenance) or it
+ * went from active to non-active (called from vgic_sync_hwirq) it was
+ * also ACKed and we we therefore assume we can clear the soft pending
+ * state (should it had been set) for this interrupt.
+ *
+ * Note: if the IRQ soft pending state was set after the IRQ was
+ * acked, it actually shouldn't be cleared, but we have no way of
+ * knowing that unless we start trapping ACKs when the soft-pending
+ * state is set.
+ */
+ vgic_dist_irq_clear_soft_pend(vcpu, vlr.irq);
+
+ /*
+ * Tell the gic to start sampling this interrupt again.
+ */
+ vgic_irq_clear_queued(vcpu, vlr.irq);
+
+ /* Any additional pending interrupt? */
+ if (vgic_irq_is_edge(vcpu, vlr.irq)) {
+ BUG_ON(!(vlr.state & LR_HW));
+ pending = vgic_dist_irq_is_pending(vcpu, vlr.irq);
+ } else {
+ if (vgic_dist_irq_get_level(vcpu, vlr.irq)) {
+ vgic_cpu_irq_set(vcpu, vlr.irq);
+ pending = 1;
+ } else {
+ vgic_dist_irq_clear_pending(vcpu, vlr.irq);
+ vgic_cpu_irq_clear(vcpu, vlr.irq);
+ }
+ }
+
+ /*
+ * Despite being EOIed, the LR may not have
+ * been marked as empty.
+ */
+ vlr.state = 0;
+ vlr.hwirq = 0;
+ vgic_set_lr(vcpu, lr, vlr);
+
+ return pending;
+}
+
static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
{
u32 status = vgic_get_interrupt_status(vcpu);
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
- bool level_pending = false;
struct kvm *kvm = vcpu->kvm;
+ int level_pending = 0;
kvm_debug("STATUS = %08x\n", status);
@@ -1358,54 +1355,22 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
for_each_set_bit(lr, eisr_ptr, vgic->nr_lr) {
struct vgic_lr vlr = vgic_get_lr(vcpu, lr);
- WARN_ON(vgic_irq_is_edge(vcpu, vlr.irq));
- spin_lock(&dist->lock);
- vgic_irq_clear_queued(vcpu, vlr.irq);
+ WARN_ON(vgic_irq_is_edge(vcpu, vlr.irq));
WARN_ON(vlr.state & LR_STATE_MASK);
- vlr.state = 0;
- vgic_set_lr(vcpu, lr, vlr);
- /*
- * If the IRQ was EOIed it was also ACKed and we we
- * therefore assume we can clear the soft pending
- * state (should it had been set) for this interrupt.
- *
- * Note: if the IRQ soft pending state was set after
- * the IRQ was acked, it actually shouldn't be
- * cleared, but we have no way of knowing that unless
- * we start trapping ACKs when the soft-pending state
- * is set.
- */
- vgic_dist_irq_clear_soft_pend(vcpu, vlr.irq);
/*
* kvm_notify_acked_irq calls kvm_set_irq()
- * to reset the IRQ level. Need to release the
- * lock for kvm_set_irq to grab it.
+ * to reset the IRQ level, which grabs the dist->lock
+ * so we call this before taking the dist->lock.
*/
- spin_unlock(&dist->lock);
-
kvm_notify_acked_irq(kvm, 0,
vlr.irq - VGIC_NR_PRIVATE_IRQS);
- spin_lock(&dist->lock);
-
- /* Any additional pending interrupt? */
- if (vgic_dist_irq_get_level(vcpu, vlr.irq)) {
- vgic_cpu_irq_set(vcpu, vlr.irq);
- level_pending = true;
- } else {
- vgic_dist_irq_clear_pending(vcpu, vlr.irq);
- vgic_cpu_irq_clear(vcpu, vlr.irq);
- }
+ spin_lock(&dist->lock);
+ level_pending |= process_queued_irq(vcpu, lr, vlr);
spin_unlock(&dist->lock);
-
- /*
- * Despite being EOIed, the LR may not have
- * been marked as empty.
- */
- vgic_sync_lr_elrsr(vcpu, lr, vlr);
}
}
@@ -1426,35 +1391,40 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
/*
* Save the physical active state, and reset it to inactive.
*
- * Return 1 if HW interrupt went from active to inactive, and 0 otherwise.
+ * Return true if there's a pending forwarded interrupt to queue.
*/
-static int vgic_sync_hwirq(struct kvm_vcpu *vcpu, struct vgic_lr vlr)
+static bool vgic_sync_hwirq(struct kvm_vcpu *vcpu, int lr, struct vgic_lr vlr)
{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
struct irq_phys_map *map;
+ bool phys_active;
+ bool level_pending;
int ret;
if (!(vlr.state & LR_HW))
- return 0;
+ return false;
map = vgic_irq_map_search(vcpu, vlr.irq);
BUG_ON(!map);
ret = irq_get_irqchip_state(map->irq,
IRQCHIP_STATE_ACTIVE,
- &map->active);
+ &phys_active);
WARN_ON(ret);
- if (map->active)
+ if (phys_active)
return 0;
- return 1;
+ spin_lock(&dist->lock);
+ level_pending = process_queued_irq(vcpu, lr, vlr);
+ spin_unlock(&dist->lock);
+ return level_pending;
}
/* Sync back the VGIC state after a guest run */
static void __kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
{
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
u64 elrsr;
unsigned long *elrsr_ptr;
@@ -1462,40 +1432,18 @@ static void __kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
bool level_pending;
level_pending = vgic_process_maintenance(vcpu);
- elrsr = vgic_get_elrsr(vcpu);
- elrsr_ptr = u64_to_bitmask(&elrsr);
/* Deal with HW interrupts, and clear mappings for empty LRs */
for (lr = 0; lr < vgic->nr_lr; lr++) {
- struct vgic_lr vlr;
-
- if (!test_bit(lr, vgic_cpu->lr_used))
- continue;
-
- vlr = vgic_get_lr(vcpu, lr);
- if (vgic_sync_hwirq(vcpu, vlr)) {
- /*
- * So this is a HW interrupt that the guest
- * EOI-ed. Clean the LR state and allow the
- * interrupt to be sampled again.
- */
- vlr.state = 0;
- vlr.hwirq = 0;
- vgic_set_lr(vcpu, lr, vlr);
- vgic_irq_clear_queued(vcpu, vlr.irq);
- set_bit(lr, elrsr_ptr);
- }
-
- if (!test_bit(lr, elrsr_ptr))
- continue;
-
- clear_bit(lr, vgic_cpu->lr_used);
+ struct vgic_lr vlr = vgic_get_lr(vcpu, lr);
+ level_pending |= vgic_sync_hwirq(vcpu, lr, vlr);
BUG_ON(vlr.irq >= dist->nr_irqs);
- vgic_cpu->vgic_irq_lr_map[vlr.irq] = LR_EMPTY;
}
/* Check if we still have something up our sleeve... */
+ elrsr = vgic_get_elrsr(vcpu);
+ elrsr_ptr = u64_to_bitmask(&elrsr);
pending = find_first_zero_bit(elrsr_ptr, vgic->nr_lr);
if (level_pending || pending < vgic->nr_lr)
set_bit(vcpu->vcpu_id, dist->irq_pending_on_cpu);
@@ -1585,6 +1533,8 @@ static int vgic_update_irq_pending(struct kvm *kvm, int cpuid,
int enabled;
bool ret = true, can_inject = true;
+ trace_vgic_update_irq_pending(cpuid, irq_num, level);
+
if (irq_num >= min(kvm->arch.vgic.nr_irqs, 1020))
return -EINVAL;
@@ -1864,30 +1814,6 @@ static void vgic_free_phys_irq_map_rcu(struct rcu_head *rcu)
}
/**
- * kvm_vgic_get_phys_irq_active - Return the active state of a mapped IRQ
- *
- * Return the logical active state of a mapped interrupt. This doesn't
- * necessarily reflects the current HW state.
- */
-bool kvm_vgic_get_phys_irq_active(struct irq_phys_map *map)
-{
- BUG_ON(!map);
- return map->active;
-}
-
-/**
- * kvm_vgic_set_phys_irq_active - Set the active state of a mapped IRQ
- *
- * Set the logical active state of a mapped interrupt. This doesn't
- * immediately affects the HW state.
- */
-void kvm_vgic_set_phys_irq_active(struct irq_phys_map *map, bool active)
-{
- BUG_ON(!map);
- map->active = active;
-}
-
-/**
* kvm_vgic_unmap_phys_irq - Remove a virtual to physical IRQ mapping
* @vcpu: The VCPU pointer
* @map: The pointer to a mapping obtained through kvm_vgic_map_phys_irq
@@ -1942,12 +1868,10 @@ void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu)
kfree(vgic_cpu->pending_shared);
kfree(vgic_cpu->active_shared);
kfree(vgic_cpu->pend_act_shared);
- kfree(vgic_cpu->vgic_irq_lr_map);
vgic_destroy_irq_phys_map(vcpu->kvm, &vgic_cpu->irq_phys_map_list);
vgic_cpu->pending_shared = NULL;
vgic_cpu->active_shared = NULL;
vgic_cpu->pend_act_shared = NULL;
- vgic_cpu->vgic_irq_lr_map = NULL;
}
static int vgic_vcpu_init_maps(struct kvm_vcpu *vcpu, int nr_irqs)
@@ -1958,18 +1882,14 @@ static int vgic_vcpu_init_maps(struct kvm_vcpu *vcpu, int nr_irqs)
vgic_cpu->pending_shared = kzalloc(sz, GFP_KERNEL);
vgic_cpu->active_shared = kzalloc(sz, GFP_KERNEL);
vgic_cpu->pend_act_shared = kzalloc(sz, GFP_KERNEL);
- vgic_cpu->vgic_irq_lr_map = kmalloc(nr_irqs, GFP_KERNEL);
if (!vgic_cpu->pending_shared
|| !vgic_cpu->active_shared
- || !vgic_cpu->pend_act_shared
- || !vgic_cpu->vgic_irq_lr_map) {
+ || !vgic_cpu->pend_act_shared) {
kvm_vgic_vcpu_destroy(vcpu);
return -ENOMEM;
}
- memset(vgic_cpu->vgic_irq_lr_map, LR_EMPTY, nr_irqs);
-
/*
* Store the number of LRs per vcpu, so we don't have to go
* all the way to the distributor structure to find out. Only
@@ -2111,14 +2031,24 @@ int vgic_init(struct kvm *kvm)
break;
}
- for (i = 0; i < dist->nr_irqs; i++) {
- if (i < VGIC_NR_PPIS)
+ /*
+ * Enable and configure all SGIs to be edge-triggere and
+ * configure all PPIs as level-triggered.
+ */
+ for (i = 0; i < VGIC_NR_PRIVATE_IRQS; i++) {
+ if (i < VGIC_NR_SGIS) {
+ /* SGIs */
vgic_bitmap_set_irq_val(&dist->irq_enabled,
vcpu->vcpu_id, i, 1);
- if (i < VGIC_NR_PRIVATE_IRQS)
vgic_bitmap_set_irq_val(&dist->irq_cfg,
vcpu->vcpu_id, i,
VGIC_CFG_EDGE);
+ } else if (i < VGIC_NR_PRIVATE_IRQS) {
+ /* PPIs */
+ vgic_bitmap_set_irq_val(&dist->irq_cfg,
+ vcpu->vcpu_id, i,
+ VGIC_CFG_LEVEL);
+ }
}
vgic_enable(vcpu);
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index 44660aee335f..77d42be6970e 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -94,6 +94,10 @@ static void async_pf_execute(struct work_struct *work)
trace_kvm_async_pf_completed(addr, gva);
+ /*
+ * This memory barrier pairs with prepare_to_wait's set_current_state()
+ */
+ smp_mb();
if (waitqueue_active(&vcpu->wq))
wake_up_interruptible(&vcpu->wq);
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 79db45336e3a..46dbc0a7dfc1 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -23,6 +23,7 @@
#include <linux/kvm_host.h>
#include <linux/kvm.h>
+#include <linux/kvm_irqfd.h>
#include <linux/workqueue.h>
#include <linux/syscalls.h>
#include <linux/wait.h>
@@ -34,73 +35,20 @@
#include <linux/srcu.h>
#include <linux/slab.h>
#include <linux/seqlock.h>
+#include <linux/irqbypass.h>
#include <trace/events/kvm.h>
#include <kvm/iodev.h>
#ifdef CONFIG_HAVE_KVM_IRQFD
-/*
- * --------------------------------------------------------------------
- * irqfd: Allows an fd to be used to inject an interrupt to the guest
- *
- * Credit goes to Avi Kivity for the original idea.
- * --------------------------------------------------------------------
- */
-
-/*
- * Resampling irqfds are a special variety of irqfds used to emulate
- * level triggered interrupts. The interrupt is asserted on eventfd
- * trigger. On acknowledgement through the irq ack notifier, the
- * interrupt is de-asserted and userspace is notified through the
- * resamplefd. All resamplers on the same gsi are de-asserted
- * together, so we don't need to track the state of each individual
- * user. We can also therefore share the same irq source ID.
- */
-struct _irqfd_resampler {
- struct kvm *kvm;
- /*
- * List of resampling struct _irqfd objects sharing this gsi.
- * RCU list modified under kvm->irqfds.resampler_lock
- */
- struct list_head list;
- struct kvm_irq_ack_notifier notifier;
- /*
- * Entry in list of kvm->irqfd.resampler_list. Use for sharing
- * resamplers among irqfds on the same gsi.
- * Accessed and modified under kvm->irqfds.resampler_lock
- */
- struct list_head link;
-};
-
-struct _irqfd {
- /* Used for MSI fast-path */
- struct kvm *kvm;
- wait_queue_t wait;
- /* Update side is protected by irqfds.lock */
- struct kvm_kernel_irq_routing_entry irq_entry;
- seqcount_t irq_entry_sc;
- /* Used for level IRQ fast-path */
- int gsi;
- struct work_struct inject;
- /* The resampler used by this irqfd (resampler-only) */
- struct _irqfd_resampler *resampler;
- /* Eventfd notified on resample (resampler-only) */
- struct eventfd_ctx *resamplefd;
- /* Entry in list of irqfds for a resampler (resampler-only) */
- struct list_head resampler_link;
- /* Used for setup/shutdown */
- struct eventfd_ctx *eventfd;
- struct list_head list;
- poll_table pt;
- struct work_struct shutdown;
-};
static struct workqueue_struct *irqfd_cleanup_wq;
static void
irqfd_inject(struct work_struct *work)
{
- struct _irqfd *irqfd = container_of(work, struct _irqfd, inject);
+ struct kvm_kernel_irqfd *irqfd =
+ container_of(work, struct kvm_kernel_irqfd, inject);
struct kvm *kvm = irqfd->kvm;
if (!irqfd->resampler) {
@@ -121,12 +69,13 @@ irqfd_inject(struct work_struct *work)
static void
irqfd_resampler_ack(struct kvm_irq_ack_notifier *kian)
{
- struct _irqfd_resampler *resampler;
+ struct kvm_kernel_irqfd_resampler *resampler;
struct kvm *kvm;
- struct _irqfd *irqfd;
+ struct kvm_kernel_irqfd *irqfd;
int idx;
- resampler = container_of(kian, struct _irqfd_resampler, notifier);
+ resampler = container_of(kian,
+ struct kvm_kernel_irqfd_resampler, notifier);
kvm = resampler->kvm;
kvm_set_irq(kvm, KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID,
@@ -141,9 +90,9 @@ irqfd_resampler_ack(struct kvm_irq_ack_notifier *kian)
}
static void
-irqfd_resampler_shutdown(struct _irqfd *irqfd)
+irqfd_resampler_shutdown(struct kvm_kernel_irqfd *irqfd)
{
- struct _irqfd_resampler *resampler = irqfd->resampler;
+ struct kvm_kernel_irqfd_resampler *resampler = irqfd->resampler;
struct kvm *kvm = resampler->kvm;
mutex_lock(&kvm->irqfds.resampler_lock);
@@ -168,7 +117,8 @@ irqfd_resampler_shutdown(struct _irqfd *irqfd)
static void
irqfd_shutdown(struct work_struct *work)
{
- struct _irqfd *irqfd = container_of(work, struct _irqfd, shutdown);
+ struct kvm_kernel_irqfd *irqfd =
+ container_of(work, struct kvm_kernel_irqfd, shutdown);
u64 cnt;
/*
@@ -191,6 +141,9 @@ irqfd_shutdown(struct work_struct *work)
/*
* It is now safe to release the object's resources
*/
+#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
+ irq_bypass_unregister_consumer(&irqfd->consumer);
+#endif
eventfd_ctx_put(irqfd->eventfd);
kfree(irqfd);
}
@@ -198,7 +151,7 @@ irqfd_shutdown(struct work_struct *work)
/* assumes kvm->irqfds.lock is held */
static bool
-irqfd_is_active(struct _irqfd *irqfd)
+irqfd_is_active(struct kvm_kernel_irqfd *irqfd)
{
return list_empty(&irqfd->list) ? false : true;
}
@@ -209,7 +162,7 @@ irqfd_is_active(struct _irqfd *irqfd)
* assumes kvm->irqfds.lock is held
*/
static void
-irqfd_deactivate(struct _irqfd *irqfd)
+irqfd_deactivate(struct kvm_kernel_irqfd *irqfd)
{
BUG_ON(!irqfd_is_active(irqfd));
@@ -218,13 +171,23 @@ irqfd_deactivate(struct _irqfd *irqfd)
queue_work(irqfd_cleanup_wq, &irqfd->shutdown);
}
+int __attribute__((weak)) kvm_arch_set_irq_inatomic(
+ struct kvm_kernel_irq_routing_entry *irq,
+ struct kvm *kvm, int irq_source_id,
+ int level,
+ bool line_status)
+{
+ return -EWOULDBLOCK;
+}
+
/*
* Called with wqh->lock held and interrupts disabled
*/
static int
irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key)
{
- struct _irqfd *irqfd = container_of(wait, struct _irqfd, wait);
+ struct kvm_kernel_irqfd *irqfd =
+ container_of(wait, struct kvm_kernel_irqfd, wait);
unsigned long flags = (unsigned long)key;
struct kvm_kernel_irq_routing_entry irq;
struct kvm *kvm = irqfd->kvm;
@@ -238,10 +201,9 @@ irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key)
irq = irqfd->irq_entry;
} while (read_seqcount_retry(&irqfd->irq_entry_sc, seq));
/* An event has been signaled, inject an interrupt */
- if (irq.type == KVM_IRQ_ROUTING_MSI)
- kvm_set_msi(&irq, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1,
- false);
- else
+ if (kvm_arch_set_irq_inatomic(&irq, kvm,
+ KVM_USERSPACE_IRQ_SOURCE_ID, 1,
+ false) == -EWOULDBLOCK)
schedule_work(&irqfd->inject);
srcu_read_unlock(&kvm->irq_srcu, idx);
}
@@ -274,37 +236,54 @@ static void
irqfd_ptable_queue_proc(struct file *file, wait_queue_head_t *wqh,
poll_table *pt)
{
- struct _irqfd *irqfd = container_of(pt, struct _irqfd, pt);
+ struct kvm_kernel_irqfd *irqfd =
+ container_of(pt, struct kvm_kernel_irqfd, pt);
add_wait_queue(wqh, &irqfd->wait);
}
/* Must be called under irqfds.lock */
-static void irqfd_update(struct kvm *kvm, struct _irqfd *irqfd)
+static void irqfd_update(struct kvm *kvm, struct kvm_kernel_irqfd *irqfd)
{
struct kvm_kernel_irq_routing_entry *e;
struct kvm_kernel_irq_routing_entry entries[KVM_NR_IRQCHIPS];
- int i, n_entries;
+ int n_entries;
n_entries = kvm_irq_map_gsi(kvm, entries, irqfd->gsi);
write_seqcount_begin(&irqfd->irq_entry_sc);
- irqfd->irq_entry.type = 0;
-
e = entries;
- for (i = 0; i < n_entries; ++i, ++e) {
- /* Only fast-path MSI. */
- if (e->type == KVM_IRQ_ROUTING_MSI)
- irqfd->irq_entry = *e;
- }
+ if (n_entries == 1)
+ irqfd->irq_entry = *e;
+ else
+ irqfd->irq_entry.type = 0;
write_seqcount_end(&irqfd->irq_entry_sc);
}
+#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
+void __attribute__((weak)) kvm_arch_irq_bypass_stop(
+ struct irq_bypass_consumer *cons)
+{
+}
+
+void __attribute__((weak)) kvm_arch_irq_bypass_start(
+ struct irq_bypass_consumer *cons)
+{
+}
+
+int __attribute__((weak)) kvm_arch_update_irqfd_routing(
+ struct kvm *kvm, unsigned int host_irq,
+ uint32_t guest_irq, bool set)
+{
+ return 0;
+}
+#endif
+
static int
kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
{
- struct _irqfd *irqfd, *tmp;
+ struct kvm_kernel_irqfd *irqfd, *tmp;
struct fd f;
struct eventfd_ctx *eventfd = NULL, *resamplefd = NULL;
int ret;
@@ -340,7 +319,7 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
irqfd->eventfd = eventfd;
if (args->flags & KVM_IRQFD_FLAG_RESAMPLE) {
- struct _irqfd_resampler *resampler;
+ struct kvm_kernel_irqfd_resampler *resampler;
resamplefd = eventfd_ctx_fdget(args->resamplefd);
if (IS_ERR(resamplefd)) {
@@ -428,6 +407,17 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
* we might race against the POLLHUP
*/
fdput(f);
+#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
+ irqfd->consumer.token = (void *)irqfd->eventfd;
+ irqfd->consumer.add_producer = kvm_arch_irq_bypass_add_producer;
+ irqfd->consumer.del_producer = kvm_arch_irq_bypass_del_producer;
+ irqfd->consumer.stop = kvm_arch_irq_bypass_stop;
+ irqfd->consumer.start = kvm_arch_irq_bypass_start;
+ ret = irq_bypass_register_consumer(&irqfd->consumer);
+ if (ret)
+ pr_info("irq bypass consumer (token %p) registration fails: %d\n",
+ irqfd->consumer.token, ret);
+#endif
return 0;
@@ -469,9 +459,18 @@ bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin)
}
EXPORT_SYMBOL_GPL(kvm_irq_has_notifier);
-void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
+void kvm_notify_acked_gsi(struct kvm *kvm, int gsi)
{
struct kvm_irq_ack_notifier *kian;
+
+ hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
+ link)
+ if (kian->gsi == gsi)
+ kian->irq_acked(kian);
+}
+
+void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
+{
int gsi, idx;
trace_kvm_ack_irq(irqchip, pin);
@@ -479,10 +478,7 @@ void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
idx = srcu_read_lock(&kvm->irq_srcu);
gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin);
if (gsi != -1)
- hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
- link)
- if (kian->gsi == gsi)
- kian->irq_acked(kian);
+ kvm_notify_acked_gsi(kvm, gsi);
srcu_read_unlock(&kvm->irq_srcu, idx);
}
@@ -525,7 +521,7 @@ kvm_eventfd_init(struct kvm *kvm)
static int
kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args)
{
- struct _irqfd *irqfd, *tmp;
+ struct kvm_kernel_irqfd *irqfd, *tmp;
struct eventfd_ctx *eventfd;
eventfd = eventfd_ctx_fdget(args->fd);
@@ -581,7 +577,7 @@ kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
void
kvm_irqfd_release(struct kvm *kvm)
{
- struct _irqfd *irqfd, *tmp;
+ struct kvm_kernel_irqfd *irqfd, *tmp;
spin_lock_irq(&kvm->irqfds.lock);
@@ -604,13 +600,23 @@ kvm_irqfd_release(struct kvm *kvm)
*/
void kvm_irq_routing_update(struct kvm *kvm)
{
- struct _irqfd *irqfd;
+ struct kvm_kernel_irqfd *irqfd;
spin_lock_irq(&kvm->irqfds.lock);
- list_for_each_entry(irqfd, &kvm->irqfds.items, list)
+ list_for_each_entry(irqfd, &kvm->irqfds.items, list) {
irqfd_update(kvm, irqfd);
+#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
+ if (irqfd->producer) {
+ int ret = kvm_arch_update_irqfd_routing(
+ irqfd->kvm, irqfd->producer->irq,
+ irqfd->gsi, 1);
+ WARN_ON(ret);
+ }
+#endif
+ }
+
spin_unlock_irq(&kvm->irqfds.lock);
}
@@ -914,9 +920,7 @@ kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
return -EINVAL;
/* ioeventfd with no length can't be combined with DATAMATCH */
- if (!args->len &&
- args->flags & (KVM_IOEVENTFD_FLAG_PIO |
- KVM_IOEVENTFD_FLAG_DATAMATCH))
+ if (!args->len && (args->flags & KVM_IOEVENTFD_FLAG_DATAMATCH))
return -EINVAL;
ret = kvm_assign_ioeventfd_idx(kvm, bus_idx, args);
diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c
index d7ea8e20dae4..f0b08a2a48ba 100644
--- a/virt/kvm/irqchip.c
+++ b/virt/kvm/irqchip.c
@@ -31,16 +31,6 @@
#include <trace/events/kvm.h>
#include "irq.h"
-struct kvm_irq_routing_table {
- int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
- u32 nr_rt_entries;
- /*
- * Array indexed by gsi. Each entry contains list of irq chips
- * the gsi is connected to.
- */
- struct hlist_head map[0];
-};
-
int kvm_irq_map_gsi(struct kvm *kvm,
struct kvm_kernel_irq_routing_entry *entries, int gsi)
{
@@ -154,11 +144,11 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt,
/*
* Do not allow GSI to be mapped to the same irqchip more than once.
- * Allow only one to one mapping between GSI and MSI.
+ * Allow only one to one mapping between GSI and non-irqchip routing.
*/
hlist_for_each_entry(ei, &rt->map[ue->gsi], link)
- if (ei->type == KVM_IRQ_ROUTING_MSI ||
- ue->type == KVM_IRQ_ROUTING_MSI ||
+ if (ei->type != KVM_IRQ_ROUTING_IRQCHIP ||
+ ue->type != KVM_IRQ_ROUTING_IRQCHIP ||
ue->u.irqchip.irqchip == ei->irqchip.irqchip)
return r;
@@ -231,6 +221,8 @@ int kvm_set_irq_routing(struct kvm *kvm,
kvm_irq_routing_update(kvm);
mutex_unlock(&kvm->irq_lock);
+ kvm_arch_irq_routing_update(kvm);
+
synchronize_srcu_expedited(&kvm->irq_srcu);
new = old;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 8db1d9361993..484079efea5b 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -230,6 +230,9 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
init_waitqueue_head(&vcpu->wq);
kvm_async_pf_vcpu_init(vcpu);
+ vcpu->pre_pcpu = -1;
+ INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
+
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page) {
r = -ENOMEM;
@@ -2018,6 +2021,8 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
} while (single_task_running() && ktime_before(cur, stop));
}
+ kvm_arch_vcpu_blocking(vcpu);
+
for (;;) {
prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
@@ -2031,6 +2036,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
finish_wait(&vcpu->wq, &wait);
cur = ktime_get();
+ kvm_arch_vcpu_unblocking(vcpu);
out:
block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
@@ -2718,6 +2724,7 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
case KVM_CAP_IRQFD:
case KVM_CAP_IRQFD_RESAMPLE:
#endif
+ case KVM_CAP_IOEVENTFD_ANY_LENGTH:
case KVM_CAP_CHECK_EXTENSION_VM:
return 1;
#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
@@ -3341,7 +3348,7 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
return -ENOSPC;
- new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) *
+ new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) *
sizeof(struct kvm_io_range)), GFP_KERNEL);
if (!new_bus)
return -ENOMEM;
@@ -3373,7 +3380,7 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
if (r)
return r;
- new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) *
+ new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) *
sizeof(struct kvm_io_range)), GFP_KERNEL);
if (!new_bus)
return -ENOMEM;
diff --git a/virt/lib/Kconfig b/virt/lib/Kconfig
new file mode 100644
index 000000000000..89a414f815d2
--- /dev/null
+++ b/virt/lib/Kconfig
@@ -0,0 +1,2 @@
+config IRQ_BYPASS_MANAGER
+ tristate
diff --git a/virt/lib/Makefile b/virt/lib/Makefile
new file mode 100644
index 000000000000..901228d1ffbc
--- /dev/null
+++ b/virt/lib/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_IRQ_BYPASS_MANAGER) += irqbypass.o
diff --git a/virt/lib/irqbypass.c b/virt/lib/irqbypass.c
new file mode 100644
index 000000000000..09a03b5a21ff
--- /dev/null
+++ b/virt/lib/irqbypass.c
@@ -0,0 +1,257 @@
+/*
+ * IRQ offload/bypass manager
+ *
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Copyright (c) 2015 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Various virtualization hardware acceleration techniques allow bypassing or
+ * offloading interrupts received from devices around the host kernel. Posted
+ * Interrupts on Intel VT-d systems can allow interrupts to be received
+ * directly by a virtual machine. ARM IRQ Forwarding allows forwarded physical
+ * interrupts to be directly deactivated by the guest. This manager allows
+ * interrupt producers and consumers to find each other to enable this sort of
+ * bypass.
+ */
+
+#include <linux/irqbypass.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("IRQ bypass manager utility module");
+
+static LIST_HEAD(producers);
+static LIST_HEAD(consumers);
+static DEFINE_MUTEX(lock);
+
+/* @lock must be held when calling connect */
+static int __connect(struct irq_bypass_producer *prod,
+ struct irq_bypass_consumer *cons)
+{
+ int ret = 0;
+
+ if (prod->stop)
+ prod->stop(prod);
+ if (cons->stop)
+ cons->stop(cons);
+
+ if (prod->add_consumer)
+ ret = prod->add_consumer(prod, cons);
+
+ if (!ret) {
+ ret = cons->add_producer(cons, prod);
+ if (ret && prod->del_consumer)
+ prod->del_consumer(prod, cons);
+ }
+
+ if (cons->start)
+ cons->start(cons);
+ if (prod->start)
+ prod->start(prod);
+
+ return ret;
+}
+
+/* @lock must be held when calling disconnect */
+static void __disconnect(struct irq_bypass_producer *prod,
+ struct irq_bypass_consumer *cons)
+{
+ if (prod->stop)
+ prod->stop(prod);
+ if (cons->stop)
+ cons->stop(cons);
+
+ cons->del_producer(cons, prod);
+
+ if (prod->del_consumer)
+ prod->del_consumer(prod, cons);
+
+ if (cons->start)
+ cons->start(cons);
+ if (prod->start)
+ prod->start(prod);
+}
+
+/**
+ * irq_bypass_register_producer - register IRQ bypass producer
+ * @producer: pointer to producer structure
+ *
+ * Add the provided IRQ producer to the list of producers and connect
+ * with any matching token found on the IRQ consumers list.
+ */
+int irq_bypass_register_producer(struct irq_bypass_producer *producer)
+{
+ struct irq_bypass_producer *tmp;
+ struct irq_bypass_consumer *consumer;
+
+ might_sleep();
+
+ if (!try_module_get(THIS_MODULE))
+ return -ENODEV;
+
+ mutex_lock(&lock);
+
+ list_for_each_entry(tmp, &producers, node) {
+ if (tmp->token == producer->token) {
+ mutex_unlock(&lock);
+ module_put(THIS_MODULE);
+ return -EBUSY;
+ }
+ }
+
+ list_for_each_entry(consumer, &consumers, node) {
+ if (consumer->token == producer->token) {
+ int ret = __connect(producer, consumer);
+ if (ret) {
+ mutex_unlock(&lock);
+ module_put(THIS_MODULE);
+ return ret;
+ }
+ break;
+ }
+ }
+
+ list_add(&producer->node, &producers);
+
+ mutex_unlock(&lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(irq_bypass_register_producer);
+
+/**
+ * irq_bypass_unregister_producer - unregister IRQ bypass producer
+ * @producer: pointer to producer structure
+ *
+ * Remove a previously registered IRQ producer from the list of producers
+ * and disconnect it from any connected IRQ consumer.
+ */
+void irq_bypass_unregister_producer(struct irq_bypass_producer *producer)
+{
+ struct irq_bypass_producer *tmp;
+ struct irq_bypass_consumer *consumer;
+
+ might_sleep();
+
+ if (!try_module_get(THIS_MODULE))
+ return; /* nothing in the list anyway */
+
+ mutex_lock(&lock);
+
+ list_for_each_entry(tmp, &producers, node) {
+ if (tmp->token != producer->token)
+ continue;
+
+ list_for_each_entry(consumer, &consumers, node) {
+ if (consumer->token == producer->token) {
+ __disconnect(producer, consumer);
+ break;
+ }
+ }
+
+ list_del(&producer->node);
+ module_put(THIS_MODULE);
+ break;
+ }
+
+ mutex_unlock(&lock);
+
+ module_put(THIS_MODULE);
+}
+EXPORT_SYMBOL_GPL(irq_bypass_unregister_producer);
+
+/**
+ * irq_bypass_register_consumer - register IRQ bypass consumer
+ * @consumer: pointer to consumer structure
+ *
+ * Add the provided IRQ consumer to the list of consumers and connect
+ * with any matching token found on the IRQ producer list.
+ */
+int irq_bypass_register_consumer(struct irq_bypass_consumer *consumer)
+{
+ struct irq_bypass_consumer *tmp;
+ struct irq_bypass_producer *producer;
+
+ if (!consumer->add_producer || !consumer->del_producer)
+ return -EINVAL;
+
+ might_sleep();
+
+ if (!try_module_get(THIS_MODULE))
+ return -ENODEV;
+
+ mutex_lock(&lock);
+
+ list_for_each_entry(tmp, &consumers, node) {
+ if (tmp->token == consumer->token) {
+ mutex_unlock(&lock);
+ module_put(THIS_MODULE);
+ return -EBUSY;
+ }
+ }
+
+ list_for_each_entry(producer, &producers, node) {
+ if (producer->token == consumer->token) {
+ int ret = __connect(producer, consumer);
+ if (ret) {
+ mutex_unlock(&lock);
+ module_put(THIS_MODULE);
+ return ret;
+ }
+ break;
+ }
+ }
+
+ list_add(&consumer->node, &consumers);
+
+ mutex_unlock(&lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(irq_bypass_register_consumer);
+
+/**
+ * irq_bypass_unregister_consumer - unregister IRQ bypass consumer
+ * @consumer: pointer to consumer structure
+ *
+ * Remove a previously registered IRQ consumer from the list of consumers
+ * and disconnect it from any connected IRQ producer.
+ */
+void irq_bypass_unregister_consumer(struct irq_bypass_consumer *consumer)
+{
+ struct irq_bypass_consumer *tmp;
+ struct irq_bypass_producer *producer;
+
+ might_sleep();
+
+ if (!try_module_get(THIS_MODULE))
+ return; /* nothing in the list anyway */
+
+ mutex_lock(&lock);
+
+ list_for_each_entry(tmp, &consumers, node) {
+ if (tmp->token != consumer->token)
+ continue;
+
+ list_for_each_entry(producer, &producers, node) {
+ if (producer->token == consumer->token) {
+ __disconnect(producer, consumer);
+ break;
+ }
+ }
+
+ list_del(&consumer->node);
+ module_put(THIS_MODULE);
+ break;
+ }
+
+ mutex_unlock(&lock);
+
+ module_put(THIS_MODULE);
+}
+EXPORT_SYMBOL_GPL(irq_bypass_unregister_consumer);