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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>
This commit is contained in:
Avi Kivity 2012-06-07 17:04:36 +03:00
parent 79d5b4c3cd
commit 510425ff33
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/emulate.c
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@ -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);