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KVM: x86/mmu: Don't update nested guest's paging bitmasks if CR0.PG=0

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Don't bother updating the bitmasks and last-leaf information if paging is
disabled as the metadata will never be used.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622175739.3610207-43-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-06-22 10:57:27 -07:00 committed by Paolo Bonzini
parent fa4b558802
commit af0eb17e99
1 changed files with 10 additions and 10 deletions
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20
arch/x86/kvm/mmu/mmu.c
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@ -4646,12 +4646,12 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
context->gva_to_gpa = paging32_gva_to_gpa;
}
if (is_cr0_pg(context))
if (is_cr0_pg(context)) {
reset_rsvds_bits_mask(vcpu, context);
update_permission_bitmask(context, false);
update_pkru_bitmask(context);
update_last_nonleaf_level(context);
update_permission_bitmask(context, false);
update_pkru_bitmask(context);
update_last_nonleaf_level(context);
}
reset_tdp_shadow_zero_bits_mask(vcpu, context);
}
@ -4899,12 +4899,12 @@ static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
else
g_context->gva_to_gpa = paging32_gva_to_gpa_nested;
if (is_cr0_pg(g_context))
if (is_cr0_pg(g_context)) {
reset_rsvds_bits_mask(vcpu, g_context);
update_permission_bitmask(g_context, false);
update_pkru_bitmask(g_context);
update_last_nonleaf_level(g_context);
update_permission_bitmask(g_context, false);
update_pkru_bitmask(g_context);
update_last_nonleaf_level(g_context);
}
}
void kvm_init_mmu(struct kvm_vcpu *vcpu)