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| author |   Lai Jiangshan <laijs@linux.alibaba.com> | 2021-12-07 17:52:30 +0800 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2021-12-10 09:38:01 -0500 |
| commit | 777ab82d7ce0451fd47bb57e331548deba57394e (patch) | |
| tree | 5e00debaa29d98948bea76576ba01d36dbff5cce /arch | |
| parent | selftests: KVM: avoid failures due to reserved HyperTransport region (diff) | |
| download | linux-dev-777ab82d7ce0451fd47bb57e331548deba57394e.tar.xz linux-dev-777ab82d7ce0451fd47bb57e331548deba57394e.zip | |
KVM: X86: Raise #GP when clearing CR0_PG in 64 bit mode
In the SDM:
If the logical processor is in 64-bit mode or if CR4.PCIDE = 1, an
attempt to clear CR0.PG causes a general-protection exception (#GP).
Software should transition to compatibility mode and clear CR4.PCIDE
before attempting to disable paging.
Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Message-Id: <20211207095230.53437-1-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/x86.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index e0aa4dd53c7f..c473498c8512 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -890,7 +890,8 @@ int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) !load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu))) return 1; - if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE)) + if (!(cr0 & X86_CR0_PG) && + (is_64_bit_mode(vcpu) || kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE))) return 1; static_call(kvm_x86_set_cr0)(vcpu, cr0); |