Commit b6744dc3 authored by Avi Kivity's avatar Avi Kivity Committed by Marcelo Tosatti
Browse files

KVM: x86 emulator: introduce NoWrite flag 



Instead of disabling writeback via OP_NONE, just specify NoWrite.

Acked-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi.kivity@gmail.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent b7d491e7

arch/x86/kvm/emulate.c

+4 −0
Original line number Diff line number Diff line
@@ -151,6 +151,7 @@ 
#define Unaligned   ((u64)1 << 42)  /* Explicitly unaligned (e.g. MOVDQU) */

#define Avx         ((u64)1 << 43)  /* Advanced Vector Extensions */

#define Fastop      ((u64)1 << 44)  /* Use opcode::u.fastop */

#define NoWrite     ((u64)1 << 45)  /* No writeback */



#define X2(x...) x, x

#define X3(x...) X2(x), x
@@ -1633,6 +1634,9 @@ static int writeback(struct x86_emulate_ctxt *ctxt) 
{

	int rc;



	if (ctxt->d & NoWrite)

		return X86EMUL_CONTINUE;



	switch (ctxt->dst.type) {

	case OP_REG:

		write_register_operand(&ctxt->dst);