From 107d6d2efa9eb8c48d050936d8019230ac6b24cd Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Mon, 5 May 2008 14:58:26 +0300 Subject: KVM: x86 emulator: fix writes to registers with modrm encodings A register destination encoded with a mod=3 encoding left dst.ptr NULL. Normally we don't trap writes to registers, but in the case of smsw, we do. Fix by pointing dst.ptr at the destination register. Signed-off-by: Avi Kivity --- arch/x86/kvm/x86_emulate.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'arch/x86/kvm/x86_emulate.c') diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c index f2a696d6a24..8a96320ab07 100644 --- a/arch/x86/kvm/x86_emulate.c +++ b/arch/x86/kvm/x86_emulate.c @@ -677,8 +677,9 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt, c->use_modrm_ea = 1; if (c->modrm_mod == 3) { - c->modrm_val = *(unsigned long *) - decode_register(c->modrm_rm, c->regs, c->d & ByteOp); + c->modrm_ptr = decode_register(c->modrm_rm, + c->regs, c->d & ByteOp); + c->modrm_val = *(unsigned long *)c->modrm_ptr; return rc; } @@ -1005,6 +1006,7 @@ done_prefixes: if ((c->d & ModRM) && c->modrm_mod == 3) { c->src.type = OP_REG; c->src.val = c->modrm_val; + c->src.ptr = c->modrm_ptr; break; } c->src.type = OP_MEM; @@ -1049,6 +1051,7 @@ done_prefixes: if ((c->d & ModRM) && c->modrm_mod == 3) { c->dst.type = OP_REG; c->dst.val = c->dst.orig_val = c->modrm_val; + c->dst.ptr = c->modrm_ptr; break; } c->dst.type = OP_MEM; -- cgit v1.2.3