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KVM: x86 emulator: introduce NoWrite flag

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Instead of disabling writeback via OP_NONE, just specify NoWrite.

Acked-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi.kivity@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2013-01-04 16:18:50 +02:00 committed by Marcelo Tosatti
parent b7d491e7f0
commit b6744dc3fb
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/emulate.c
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@ -151,6 +151,7 @@
#define Unaligned ((u64)1 << 42) /* Explicitly unaligned (e.g. MOVDQU) */ #define Unaligned ((u64)1 << 42) /* Explicitly unaligned (e.g. MOVDQU) */
#define Avx ((u64)1 << 43) /* Advanced Vector Extensions */ #define Avx ((u64)1 << 43) /* Advanced Vector Extensions */
#define Fastop ((u64)1 << 44) /* Use opcode::u.fastop */ #define Fastop ((u64)1 << 44) /* Use opcode::u.fastop */
#define NoWrite ((u64)1 << 45) /* No writeback */
#define X2(x...) x, x #define X2(x...) x, x
#define X3(x...) X2(x), x #define X3(x...) X2(x), x
@ -1633,6 +1634,9 @@ static int writeback(struct x86_emulate_ctxt *ctxt)
{ {
int rc; int rc;
if (ctxt->d & NoWrite)
return X86EMUL_CONTINUE;
switch (ctxt->dst.type) { switch (ctxt->dst.type) {
case OP_REG: case OP_REG:
write_register_operand(&ctxt->dst); write_register_operand(&ctxt->dst);