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Two bugfix patches.

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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:
 "Two bugfixes"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: VMX: update PFEC_MASK/PFEC_MATCH together with PF intercept
  KVM: arm64: Restore missing ISB on nVHE __tlb_switch_to_guest
This commit is contained in:
Linus Torvalds 2020-10-03 12:19:23 -07:00
commit 22fbc037cd
2 changed files with 19 additions and 10 deletions
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7
arch/arm64/kvm/hyp/nvhe/tlb.c
View File

@ -31,7 +31,14 @@ static void __tlb_switch_to_guest(struct kvm_s2_mmu *mmu,
isb(); isb();
} }
/*
* __load_guest_stage2() includes an ISB only when the AT
* workaround is applied. Take care of the opposite condition,
* ensuring that we always have an ISB, but not two ISBs back
* to back.
*/
__load_guest_stage2(mmu); __load_guest_stage2(mmu);
asm(ALTERNATIVE("isb", "nop", ARM64_WORKAROUND_SPECULATIVE_AT));
} }
static void __tlb_switch_to_host(struct tlb_inv_context *cxt) static void __tlb_switch_to_host(struct tlb_inv_context *cxt)

22
arch/x86/kvm/vmx/vmx.c
View File

@ -794,6 +794,18 @@ void update_exception_bitmap(struct kvm_vcpu *vcpu)
*/ */
if (is_guest_mode(vcpu)) if (is_guest_mode(vcpu))
eb |= get_vmcs12(vcpu)->exception_bitmap; eb |= get_vmcs12(vcpu)->exception_bitmap;
else {
/*
* If EPT is enabled, #PF is only trapped if MAXPHYADDR is mismatched
* between guest and host. In that case we only care about present
* faults. For vmcs02, however, PFEC_MASK and PFEC_MATCH are set in
* prepare_vmcs02_rare.
*/
bool selective_pf_trap = enable_ept && (eb & (1u << PF_VECTOR));
int mask = selective_pf_trap ? PFERR_PRESENT_MASK : 0;
vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, mask);
vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, mask);
}
vmcs_write32(EXCEPTION_BITMAP, eb); vmcs_write32(EXCEPTION_BITMAP, eb);
} }
@ -4355,16 +4367,6 @@ static void init_vmcs(struct vcpu_vmx *vmx)
vmx->pt_desc.guest.output_mask = 0x7F; vmx->pt_desc.guest.output_mask = 0x7F;
vmcs_write64(GUEST_IA32_RTIT_CTL, 0); vmcs_write64(GUEST_IA32_RTIT_CTL, 0);
} }
/*
* If EPT is enabled, #PF is only trapped if MAXPHYADDR is mismatched
* between guest and host. In that case we only care about present
* faults.
*/
if (enable_ept) {
vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, PFERR_PRESENT_MASK);
vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, PFERR_PRESENT_MASK);
}
} }
static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)