diff options
| author |   Avi Kivity <avi@redhat.com> | 2012-06-07 17:04:36 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-07-09 14:19:01 +0300 |
| commit | 510425ff3344df03a1f94bce49e659ae302e0d34 (patch) | |
| tree | 0b9e1c771f23ec8efd1b18eabfa11184c4d16f0a | |
| parent | KVM: x86 emulator: allow loading null SS in long mode (diff) | |
KVM: x86 emulator: fix LIDT/LGDT in long mode
The operand size for these instructions is 8 bytes in long mode, even without
a REX prefix. Set it explicitly.
Triggered while booting Linux with emulate_invalid_guest_state=1.
Signed-off-by: Avi Kivity <avi@redhat.com>
| -rw-r--r-- | arch/x86/kvm/emulate.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index fe4340f62137..24c84251648b 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2997,6 +2997,8 @@ static int em_lgdt(struct x86_emulate_ctxt *ctxt) struct desc_ptr desc_ptr; int rc; + if (ctxt->mode == X86EMUL_MODE_PROT64) + ctxt->op_bytes = 8; rc = read_descriptor(ctxt, ctxt->src.addr.mem, &desc_ptr.size, &desc_ptr.address, ctxt->op_bytes); @@ -3024,6 +3026,8 @@ static int em_lidt(struct x86_emulate_ctxt *ctxt) struct desc_ptr desc_ptr; int rc; + if (ctxt->mode == X86EMUL_MODE_PROT64) + ctxt->op_bytes = 8; rc = read_descriptor(ctxt, ctxt->src.addr.mem, &desc_ptr.size, &desc_ptr.address, ctxt->op_bytes); |