Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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>
authored by Lai Jiangshan and committed by Paolo Bonzini 777ab82d c8cc43c1
+2
-1
arch/x86/kvm/x86.c
+2
-1
arch/x86/kvm/x86.c
···
890
890
!load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu)))
891
891
return 1;
892
892
893
-
if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE))
893
+
if (!(cr0 & X86_CR0_PG) &&
894
+
(is_64_bit_mode(vcpu) || kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE)))
894
895
return 1;
895
896
896
897
static_call(kvm_x86_set_cr0)(vcpu, cr0);