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

arch/x86/kvm/emulate.c

+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;