diff options
Diffstat (limited to 'arch/arm64/kvm/hyp/tlb.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/tlb.c | 71 |
1 files changed, 61 insertions, 10 deletions
diff --git a/arch/arm64/kvm/hyp/tlb.c b/arch/arm64/kvm/hyp/tlb.c index 4dbd9c69a96d..76c30866069e 100644 --- a/arch/arm64/kvm/hyp/tlb.c +++ b/arch/arm64/kvm/hyp/tlb.c @@ -15,20 +15,54 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ +#include <linux/irqflags.h> + #include <asm/kvm_hyp.h> #include <asm/kvm_mmu.h> #include <asm/tlbflush.h> -static void __hyp_text __tlb_switch_to_guest_vhe(struct kvm *kvm) +struct tlb_inv_context { + unsigned long flags; + u64 tcr; + u64 sctlr; +}; + +static void __hyp_text __tlb_switch_to_guest_vhe(struct kvm *kvm, + struct tlb_inv_context *cxt) { u64 val; + local_irq_save(cxt->flags); + + if (cpus_have_const_cap(ARM64_WORKAROUND_1165522)) { + /* + * For CPUs that are affected by ARM erratum 1165522, we + * cannot trust stage-1 to be in a correct state at that + * point. Since we do not want to force a full load of the + * vcpu state, we prevent the EL1 page-table walker to + * allocate new TLBs. This is done by setting the EPD bits + * in the TCR_EL1 register. We also need to prevent it to + * allocate IPA->PA walks, so we enable the S1 MMU... + */ + val = cxt->tcr = read_sysreg_el1(tcr); + val |= TCR_EPD1_MASK | TCR_EPD0_MASK; + write_sysreg_el1(val, tcr); + val = cxt->sctlr = read_sysreg_el1(sctlr); + val |= SCTLR_ELx_M; + write_sysreg_el1(val, sctlr); + } + /* * With VHE enabled, we have HCR_EL2.{E2H,TGE} = {1,1}, and * most TLB operations target EL2/EL0. In order to affect the * guest TLBs (EL1/EL0), we need to change one of these two * bits. Changing E2H is impossible (goodbye TTBR1_EL2), so * let's flip TGE before executing the TLB operation. + * + * ARM erratum 1165522 requires some special handling (again), + * as we need to make sure both stages of translation are in + * place before clearing TGE. __load_guest_stage2() already + * has an ISB in order to deal with this. */ __load_guest_stage2(kvm); val = read_sysreg(hcr_el2); @@ -37,7 +71,8 @@ static void __hyp_text __tlb_switch_to_guest_vhe(struct kvm *kvm) isb(); } -static void __hyp_text __tlb_switch_to_guest_nvhe(struct kvm *kvm) +static void __hyp_text __tlb_switch_to_guest_nvhe(struct kvm *kvm, + struct tlb_inv_context *cxt) { __load_guest_stage2(kvm); isb(); @@ -48,7 +83,8 @@ static hyp_alternate_select(__tlb_switch_to_guest, __tlb_switch_to_guest_vhe, ARM64_HAS_VIRT_HOST_EXTN); -static void __hyp_text __tlb_switch_to_host_vhe(struct kvm *kvm) +static void __hyp_text __tlb_switch_to_host_vhe(struct kvm *kvm, + struct tlb_inv_context *cxt) { /* * We're done with the TLB operation, let's restore the host's @@ -56,9 +92,19 @@ static void __hyp_text __tlb_switch_to_host_vhe(struct kvm *kvm) */ write_sysreg(0, vttbr_el2); write_sysreg(HCR_HOST_VHE_FLAGS, hcr_el2); + isb(); + + if (cpus_have_const_cap(ARM64_WORKAROUND_1165522)) { + /* Restore the registers to what they were */ + write_sysreg_el1(cxt->tcr, tcr); + write_sysreg_el1(cxt->sctlr, sctlr); + } + + local_irq_restore(cxt->flags); } -static void __hyp_text __tlb_switch_to_host_nvhe(struct kvm *kvm) +static void __hyp_text __tlb_switch_to_host_nvhe(struct kvm *kvm, + struct tlb_inv_context *cxt) { write_sysreg(0, vttbr_el2); } @@ -70,11 +116,13 @@ static hyp_alternate_select(__tlb_switch_to_host, void __hyp_text __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa) { + struct tlb_inv_context cxt; + dsb(ishst); /* Switch to requested VMID */ kvm = kern_hyp_va(kvm); - __tlb_switch_to_guest()(kvm); + __tlb_switch_to_guest()(kvm, &cxt); /* * We could do so much better if we had the VA as well. @@ -117,36 +165,39 @@ void __hyp_text __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa) if (!has_vhe() && icache_is_vpipt()) __flush_icache_all(); - __tlb_switch_to_host()(kvm); + __tlb_switch_to_host()(kvm, &cxt); } void __hyp_text __kvm_tlb_flush_vmid(struct kvm *kvm) { + struct tlb_inv_context cxt; + dsb(ishst); /* Switch to requested VMID */ kvm = kern_hyp_va(kvm); - __tlb_switch_to_guest()(kvm); + __tlb_switch_to_guest()(kvm, &cxt); __tlbi(vmalls12e1is); dsb(ish); isb(); - __tlb_switch_to_host()(kvm); + __tlb_switch_to_host()(kvm, &cxt); } void __hyp_text __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu) { struct kvm *kvm = kern_hyp_va(kern_hyp_va(vcpu)->kvm); + struct tlb_inv_context cxt; /* Switch to requested VMID */ - __tlb_switch_to_guest()(kvm); + __tlb_switch_to_guest()(kvm, &cxt); __tlbi(vmalle1); dsb(nsh); isb(); - __tlb_switch_to_host()(kvm); + __tlb_switch_to_host()(kvm, &cxt); } void __hyp_text __kvm_flush_vm_context(void) |