Messages in this thread Patch in this message | | | From | Lai Jiangshan <> | Subject | [PATCH] KVM: X86: Raise #GP when clearing CR0_PG in 64 bit mode | Date | Tue, 7 Dec 2021 17:52:30 +0800 |
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From: Lai Jiangshan <laijs@linux.alibaba.com>
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> --- arch/x86/kvm/x86.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 00f5b2b82909..78c40ac3b197 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -906,7 +906,8 @@ int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) !load_pdptrs(vcpu, 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); -- 2.19.1.6.gb485710b
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