KVM: x86: emulate movdqa

An Ubuntu 9.10 Karmic Koala guest is unable to boot or install due to
missing movdqa emulation:

kvm_exit: reason EXCEPTION_NMI rip 0x7fef3e025a7b info 7fef3e799000 80000b0e
kvm_page_fault: address 7fef3e799000 error_code f
kvm_emulate_insn: 0:7fef3e025a7b: 66 0f 7f 07 (prot64)

movdqa %xmm0,(%rdi)

[avi: mark it explicitly aligned]

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 6302e5c..b160fb1 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2818,7 +2818,7 @@ static int em_rdpmc(struct x86_emulate_ctxt *ctxt)
 
 static int em_mov(struct x86_emulate_ctxt *ctxt)
 {
-       ctxt->dst.val = ctxt->src.val;
+       memcpy(ctxt->dst.valptr, ctxt->src.valptr, ctxt->op_bytes);
        return X86EMUL_CONTINUE;
 }
 
@@ -2898,12 +2898,6 @@ static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt)
        return load_segment_descriptor(ctxt, sel, ctxt->modrm_reg);
 }
 
-static int em_movdqu(struct x86_emulate_ctxt *ctxt)
-{
-       memcpy(&ctxt->dst.vec_val, &ctxt->src.vec_val, ctxt->op_bytes);
-       return X86EMUL_CONTINUE;
-}
-
 static int em_invlpg(struct x86_emulate_ctxt *ctxt)
 {
        int rc;
@@ -3443,7 +3437,7 @@ static struct opcode group11[] = {
 };
 
 static struct gprefix pfx_0f_6f_0f_7f = {
-       N, N, N, I(Sse | Unaligned, em_movdqu),
+       N, I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov),
 };
 
 static struct opcode opcode_table[256] = {