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Commit aaa05f24 authored by Nadav Amit's avatar Nadav Amit Committed by Paolo Bonzini
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KVM: x86: Return error on cmpxchg16b emulation



cmpxchg16b is currently unimplemented in the emulator. The least we can do is
return error upon the emulation of this instruction.

Signed-off-by: default avatarNadav Amit <namit@cs.technion.ac.il>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 67f4d428
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+4 −1
Original line number Diff line number Diff line
@@ -1999,6 +1999,9 @@ static int em_cmpxchg8b(struct x86_emulate_ctxt *ctxt)
{
	u64 old = ctxt->dst.orig_val64;

	if (ctxt->dst.bytes == 16)
		return X86EMUL_UNHANDLEABLE;

	if (((u32) (old >> 0) != (u32) reg_read(ctxt, VCPU_REGS_RAX)) ||
	    ((u32) (old >> 32) != (u32) reg_read(ctxt, VCPU_REGS_RDX))) {
		*reg_write(ctxt, VCPU_REGS_RAX) = (u32) (old >> 0);
@@ -4077,7 +4080,7 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
		op->orig_val = op->val;
		break;
	case OpMem64:
		ctxt->memop.bytes = 8;
		ctxt->memop.bytes = (ctxt->op_bytes == 8) ? 16 : 8;
		goto mem_common;
	case OpAcc:
		op->type = OP_REG;