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KVM: x86/mmu: Replace PFERR_NESTED_GUEST_PAGE with a more descriptive helper

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Drop the globally visible PFERR_NESTED_GUEST_PAGE and replace it with a
more appropriately named is_write_to_guest_page_table().  The macro name
is misleading, because while all nNPT walks match PAGE|WRITE|PRESENT, the
reverse is not true.

No functional change intended.

Link: https://lore.kernel.org/r/20240831001538.336683-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2024-08-30 17:15:17 -07:00
parent 1dc9cc1c4c
commit 4ececec19a
2 changed files with 8 additions and 5 deletions
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4
arch/x86/include/asm/kvm_host.h
View File

@@ -280,10 +280,6 @@ enum x86_intercept_stage;
#define PFERR_PRIVATE_ACCESS BIT_ULL(49)
#define PFERR_SYNTHETIC_MASK (PFERR_IMPLICIT_ACCESS | PFERR_PRIVATE_ACCESS)
#define PFERR_NESTED_GUEST_PAGE (PFERR_GUEST_PAGE_MASK | \
PFERR_WRITE_MASK | \
PFERR_PRESENT_MASK)
/* apic attention bits */
#define KVM_APIC_CHECK_VAPIC 0
/*

9
arch/x86/kvm/mmu/mmu.c
View File

@@ -5945,6 +5945,13 @@ void kvm_mmu_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
write_unlock(&vcpu->kvm->mmu_lock);
}
static bool is_write_to_guest_page_table(u64 error_code)
{
const u64 mask = PFERR_GUEST_PAGE_MASK | PFERR_WRITE_MASK | PFERR_PRESENT_MASK;
return (error_code & mask) == mask;
}
int noinline kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
void *insn, int insn_len)
{
@@ -6008,7 +6015,7 @@ int noinline kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 err
* and resume the guest.
*/
if (vcpu->arch.mmu->root_role.direct &&
(error_code & PFERR_NESTED_GUEST_PAGE) == PFERR_NESTED_GUEST_PAGE) {
is_write_to_guest_page_table(error_code)) {
kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(cr2_or_gpa));
return 1;
}