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authorAvi Kivity <avi.kivity@gmail.com>2013-01-04 16:18:50 +0200
committerMarcelo Tosatti <mtosatti@redhat.com>2013-01-09 17:39:18 -0200
commitb6744dc3fb55fda7cfcb53beecfa056f02415e6d (patch)
tree4e0103e988c64576910bca7a7540f6b20a875f38 /arch/x86/kvm/emulate.c
parentb7d491e7f065b5b957a27a65c9e7cd3ef96b2736 (diff)
KVM: x86 emulator: introduce NoWrite flag
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>
Diffstat (limited to 'arch/x86/kvm/emulate.c')
-rw-r--r--arch/x86/kvm/emulate.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 42c53c8071be..fe113fbb3737 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -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);

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