diff options
| author | Wanpeng Li <wanpengli@tencent.com> | 2018-05-13 02:24:47 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-05-14 18:14:16 +0200 |
| commit | a780a3ea628268b2ad0ed43d7f28d90db0ff18be (patch) | |
| tree | a915ee042396777168e7cf4ec31746cd1b6428c0 /arch/x86/kvm/emulate.c | |
| parent | 64f7a11586ab9262f00b8b6eceef6d8154921bd8 (diff) | |
KVM: X86: Fix reserved bits check for MOV to CR3
MSB of CR3 is a reserved bit if the PCIDE bit is not set in CR4.
It should be checked when PCIDE bit is not set, however commit
'd1cd3ce900441 ("KVM: MMU: check guest CR3 reserved bits based on
its physical address width")' removes the bit 63 checking
unconditionally. This patch fixes it by checking bit 63 of CR3
when PCIDE bit is not set in CR4.
Fixes: d1cd3ce900441 (KVM: MMU: check guest CR3 reserved bits based on its physical address width)
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Liran Alon <liran.alon@oracle.com>
Cc: stable@vger.kernel.org
Reviewed-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/emulate.c')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index b3705ae52824..143b7ae52624 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -4189,7 +4189,9 @@ static int check_cr_write(struct x86_emulate_ctxt *ctxt) maxphyaddr = eax & 0xff; else maxphyaddr = 36; - rsvd = rsvd_bits(maxphyaddr, 62); + rsvd = rsvd_bits(maxphyaddr, 63); + if (ctxt->ops->get_cr(ctxt, 4) & X86_CR4_PCIDE) + rsvd &= ~CR3_PCID_INVD; } if (new_val & rsvd) |