From 96051572c819194c37a8367624b285be10297eca Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Sun, 10 Jun 2012 17:21:18 +0300 Subject: [PATCH] KVM: x86 emulator: emulate SGDT/SIDT Opcodes 0F 01 /0 and 0F 01 /1 Signed-off-by: Avi Kivity --- arch/x86/kvm/emulate.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 7552c0ac6e7..5053e9efb14 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -3026,6 +3026,35 @@ static int em_vmcall(struct x86_emulate_ctxt *ctxt) return X86EMUL_CONTINUE; } +static int emulate_store_desc_ptr(struct x86_emulate_ctxt *ctxt, + void (*get)(struct x86_emulate_ctxt *ctxt, + struct desc_ptr *ptr)) +{ + struct desc_ptr desc_ptr; + + if (ctxt->mode == X86EMUL_MODE_PROT64) + ctxt->op_bytes = 8; + get(ctxt, &desc_ptr); + if (ctxt->op_bytes == 2) { + ctxt->op_bytes = 4; + desc_ptr.address &= 0x00ffffff; + } + /* Disable writeback. */ + ctxt->dst.type = OP_NONE; + return segmented_write(ctxt, ctxt->dst.addr.mem, + &desc_ptr, 2 + ctxt->op_bytes); +} + +static int em_sgdt(struct x86_emulate_ctxt *ctxt) +{ + return emulate_store_desc_ptr(ctxt, ctxt->ops->get_gdt); +} + +static int em_sidt(struct x86_emulate_ctxt *ctxt) +{ + return emulate_store_desc_ptr(ctxt, ctxt->ops->get_idt); +} + static int em_lgdt(struct x86_emulate_ctxt *ctxt) { struct desc_ptr desc_ptr; @@ -3485,8 +3514,8 @@ static struct opcode group6[] = { }; static struct group_dual group7 = { { - DI(Mov | DstMem | Priv, sgdt), - DI(Mov | DstMem | Priv, sidt), + II(Mov | DstMem | Priv, em_sgdt, sgdt), + II(Mov | DstMem | Priv, em_sidt, sidt), II(SrcMem | Priv, em_lgdt, lgdt), II(SrcMem | Priv, em_lidt, lidt), II(SrcNone | DstMem | Mov, em_smsw, smsw), N, -- 2.20.1