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authorPaolo Bonzini <pbonzini@redhat.com>2013-03-12 13:16:28 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2014-05-13 13:12:40 +0200
commit43175fa96add507afee6c0a83ec9ffe0ca130fc3 (patch)
tree3b720e0bcd3c0d806f0276bf8e38f9943bb38ee2 /target-i386
parent05e7e819d7d159a75a46354aead95e1199b8f168 (diff)
downloadqemu-arm-43175fa96add507afee6c0a83ec9ffe0ca130fc3.tar.gz
target-i386: preserve FPU and MSR state on INIT
Most MSRs, plus the FPU, MMX, MXCSR, XMM and YMM registers should not be zeroed on INIT (Table 9-1 in the Intel SDM). Copy them out of CPUX86State and back in, instead of special casing env->pat. The relevant fields are already consecutive except PAT and SMBASE. However: - KVM and Hyper-V MSRs should be reset because they include memory locations written by the hypervisor. These MSRs are moved together at the end of the preserved area. - SVM state can be moved out of the way since it is written by VMRUN. Cc: Andreas Faerber <afaerber@suse.de> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target-i386')
-rw-r--r--target-i386/cpu.c3
-rw-r--r--target-i386/cpu.h42
-rw-r--r--target-i386/helper.c10
3 files changed, 35 insertions, 20 deletions
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 79b1bb92f0..042a48d703 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -2418,8 +2418,7 @@ static void x86_cpu_reset(CPUState *s)
xcc->parent_reset(s);
-
- memset(env, 0, offsetof(CPUX86State, pat));
+ memset(env, 0, offsetof(CPUX86State, cpuid_level));
tlb_flush(s, 1);
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 827b33e696..5fd1e20b57 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -801,6 +801,9 @@ typedef struct CPUX86State {
BNDCSReg bndcs_regs;
uint64_t msr_bndcfgs;
+ /* Beginning of state preserved by INIT (dummy marker). */
+ struct {} start_init_save;
+
/* FPU state */
unsigned int fpstt; /* top of stack index */
uint16_t fpus;
@@ -833,15 +836,6 @@ typedef struct CPUX86State {
uint64_t star;
uint64_t vm_hsave;
- uint64_t vm_vmcb;
- uint64_t tsc_offset;
- uint64_t intercept;
- uint16_t intercept_cr_read;
- uint16_t intercept_cr_write;
- uint16_t intercept_dr_read;
- uint16_t intercept_dr_write;
- uint32_t intercept_exceptions;
- uint8_t v_tpr;
#ifdef TARGET_X86_64
target_ulong lstar;
@@ -849,11 +843,6 @@ typedef struct CPUX86State {
target_ulong fmask;
target_ulong kernelgsbase;
#endif
- uint64_t system_time_msr;
- uint64_t wall_clock_msr;
- uint64_t steal_time_msr;
- uint64_t async_pf_en_msr;
- uint64_t pv_eoi_en_msr;
uint64_t tsc;
uint64_t tsc_adjust;
@@ -870,6 +859,19 @@ typedef struct CPUX86State {
uint64_t msr_fixed_counters[MAX_FIXED_COUNTERS];
uint64_t msr_gp_counters[MAX_GP_COUNTERS];
uint64_t msr_gp_evtsel[MAX_GP_COUNTERS];
+
+ uint64_t pat;
+ uint32_t smbase;
+
+ /* End of state preserved by INIT (dummy marker). */
+ struct {} end_init_save;
+
+ uint64_t system_time_msr;
+ uint64_t wall_clock_msr;
+ uint64_t steal_time_msr;
+ uint64_t async_pf_en_msr;
+ uint64_t pv_eoi_en_msr;
+
uint64_t msr_hv_hypercall;
uint64_t msr_hv_guest_os_id;
uint64_t msr_hv_vapic;
@@ -884,9 +886,18 @@ typedef struct CPUX86State {
struct CPUBreakpoint *cpu_breakpoint[4];
struct CPUWatchpoint *cpu_watchpoint[4];
}; /* break/watchpoints for dr[0..3] */
- uint32_t smbase;
int old_exception; /* exception in flight */
+ uint64_t vm_vmcb;
+ uint64_t tsc_offset;
+ uint64_t intercept;
+ uint16_t intercept_cr_read;
+ uint16_t intercept_cr_write;
+ uint16_t intercept_dr_read;
+ uint16_t intercept_dr_write;
+ uint32_t intercept_exceptions;
+ uint8_t v_tpr;
+
/* KVM states, automatically cleared on reset */
uint8_t nmi_injected;
uint8_t nmi_pending;
@@ -894,7 +905,6 @@ typedef struct CPUX86State {
CPU_COMMON
/* Fields from here on are preserved across CPU reset. */
- uint64_t pat;
/* processor features (e.g. for CPUID insn) */
uint32_t cpuid_level;
diff --git a/target-i386/helper.c b/target-i386/helper.c
index 27b35826e9..46d20e4b89 100644
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -1330,12 +1330,18 @@ void do_cpu_init(X86CPU *cpu)
{
CPUState *cs = CPU(cpu);
CPUX86State *env = &cpu->env;
+ CPUX86State *save = g_new(CPUX86State, 1);
int sipi = cs->interrupt_request & CPU_INTERRUPT_SIPI;
- uint64_t pat = env->pat;
+
+ *save = *env;
cpu_reset(cs);
cs->interrupt_request = sipi;
- env->pat = pat;
+ memcpy(&env->start_init_save, &save->start_init_save,
+ offsetof(CPUX86State, end_init_save) -
+ offsetof(CPUX86State, start_init_save));
+ g_free(save);
+
if (kvm_enabled()) {
kvm_arch_do_init_vcpu(cpu);
}