From 510425ff3344df03a1f94bce49e659ae302e0d34 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Thu, 7 Jun 2012 17:04:36 +0300 Subject: [PATCH] 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 --- arch/x86/kvm/emulate.c | 4 ++++ 1 file changed, 4 insertions(+) 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); -- 2.20.1