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Code Issues Releases Wiki Activity

KVM: x86: Drop pointless @reset_roots from kvm_init_mmu()

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Remove the @reset_roots param from kvm_init_mmu(), the one user,
kvm_mmu_reset_context() has already unloaded the MMU and thus freed and
invalidated all roots.  This also happens to be why the reset_roots=true
paths doesn't leak roots; they're already invalid.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210609234235.1244004-14-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-06-09 16:42:33 -07:00 committed by Paolo Bonzini
parent e62f1aa8b9
commit c906066288
5 changed files with 6 additions and 15 deletions
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2
arch/x86/kvm/mmu.h
View file

@ -65,7 +65,7 @@ void kvm_mmu_set_ept_masks(bool has_ad_bits, bool has_exec_only);
void
reset_shadow_zero_bits_mask(struct kvm_vcpu *vcpu, struct kvm_mmu *context);
void kvm_init_mmu(struct kvm_vcpu *vcpu, bool reset_roots);
void kvm_init_mmu(struct kvm_vcpu *vcpu);
void kvm_init_shadow_npt_mmu(struct kvm_vcpu *vcpu, u32 cr0, u32 cr4, u32 efer,
gpa_t nested_cr3);
void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,

13
arch/x86/kvm/mmu/mmu.c
View file

@ -4877,17 +4877,8 @@ static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
update_last_nonleaf_level(vcpu, g_context);
}
void kvm_init_mmu(struct kvm_vcpu *vcpu, bool reset_roots)
void kvm_init_mmu(struct kvm_vcpu *vcpu)
{
if (reset_roots) {
uint i;
vcpu->arch.mmu->root_hpa = INVALID_PAGE;
for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++)
vcpu->arch.mmu->prev_roots[i] = KVM_MMU_ROOT_INFO_INVALID;
}
if (mmu_is_nested(vcpu))
init_kvm_nested_mmu(vcpu);
else if (tdp_enabled)
@ -4913,7 +4904,7 @@ kvm_mmu_calc_root_page_role(struct kvm_vcpu *vcpu)
void kvm_mmu_reset_context(struct kvm_vcpu *vcpu)
{
kvm_mmu_unload(vcpu);
kvm_init_mmu(vcpu, true);
kvm_init_mmu(vcpu);
}
EXPORT_SYMBOL_GPL(kvm_mmu_reset_context);

2
arch/x86/kvm/svm/nested.c
View file

@ -419,7 +419,7 @@ static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
vcpu->arch.cr3 = cr3;
kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);
kvm_init_mmu(vcpu, false);
kvm_init_mmu(vcpu);
return 0;
}

2
arch/x86/kvm/vmx/nested.c
View file

@ -1098,7 +1098,7 @@ static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
vcpu->arch.cr3 = cr3;
kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);
kvm_init_mmu(vcpu, false);
kvm_init_mmu(vcpu);
return 0;
}

2
arch/x86/kvm/x86.c
View file

@ -10606,7 +10606,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
vcpu_load(vcpu);
kvm_set_tsc_khz(vcpu, max_tsc_khz);
kvm_vcpu_reset(vcpu, false);
kvm_init_mmu(vcpu, false);
kvm_init_mmu(vcpu);
vcpu_put(vcpu);
return 0;