diff options
| author | Yu Zhang <yu.c.zhang@linux.intel.com> | 2017-08-24 20:27:53 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-08-24 18:09:16 +0200 |
| commit | d1cd3ce9004412949163bfaa062a4df98fe75a98 (patch) | |
| tree | 2e1f466ee6a60218518586f64058f23a0b3fb68f /arch/x86/kvm/emulate.c | |
| parent | e911eb3b3414e62cbd9853e0a91c124f4a545c0f (diff) | |
KVM: MMU: check guest CR3 reserved bits based on its physical address width.
Currently, KVM uses CR3_L_MODE_RESERVED_BITS to check the
reserved bits in CR3. Yet the length of reserved bits in
guest CR3 should be based on the physical address width
exposed to the VM. This patch changes CR3 check logic to
calculate the reserved bits at runtime.
Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.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 | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 319d91f6f3c4..a89b595dab22 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -28,6 +28,7 @@ #include "x86.h" #include "tss.h" +#include "mmu.h" /* * Operand types @@ -4097,8 +4098,17 @@ static int check_cr_write(struct x86_emulate_ctxt *ctxt) u64 rsvd = 0; ctxt->ops->get_msr(ctxt, MSR_EFER, &efer); - if (efer & EFER_LMA) - rsvd = CR3_L_MODE_RESERVED_BITS & ~CR3_PCID_INVD; + if (efer & EFER_LMA) { + u64 maxphyaddr; + u32 eax = 0x80000008; + + if (ctxt->ops->get_cpuid(ctxt, &eax, NULL, NULL, + NULL, false)) + maxphyaddr = eax & 0xff; + else + maxphyaddr = 36; + rsvd = rsvd_bits(maxphyaddr, 62); + } if (new_val & rsvd) return emulate_gp(ctxt, 0); |