[PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation

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* [PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation
@ 2011-04-12 15:24 Takuya Yoshikawa
  2011-04-12 15:29 ` [PATCH 2/3 v2] KVM: x86 emulator: Make emulate_push() store the value directly Takuya Yoshikawa
                   ` (2 more replies)
  0 siblings, 3 replies; 5+ messages in thread
From: Takuya Yoshikawa @ 2011-04-12 15:24 UTC (permalink / raw)
  To: avi, mtosatti; +Cc: kvm, yoshikawa.takuya, gleb

From: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>

This stops "CMP r/m, reg" to write back the data into memory.
Pointed out by Avi.

The writeback suppression now covers CMP, CMPS, SCAS.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
---
 Changelog v1->v2: moved the line just after the cmp label.

 arch/x86/kvm/emulate.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 3e8b4ab..db48e91 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3671,6 +3671,7 @@ special_insn:
 		break;
 	case 0x38 ... 0x3d:
 	      cmp:		/* cmp */
+		c->dst.type = OP_NONE; /* Disable writeback. */
 		emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
 		break;
 	case 0x40 ... 0x47: /* inc r16/r32 */
@@ -3797,7 +3798,6 @@ special_insn:
 		rc = emulate_popf(ctxt, ops, &c->dst.val, c->op_bytes);
 		break;
 	case 0xa6 ... 0xa7:	/* cmps */
-		c->dst.type = OP_NONE; /* Disable writeback. */
 		goto cmp;
 	case 0xa8 ... 0xa9:	/* test ax, imm */
 		goto test;
-- 
1.7.1


^ permalink raw reply related	[flat|nested] 5+ messages in thread

* [PATCH 2/3 v2] KVM: x86 emulator: Make emulate_push() store the value directly
  2011-04-12 15:24 [PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation Takuya Yoshikawa
@ 2011-04-12 15:29 ` Takuya Yoshikawa
  2011-04-12 15:31 ` [PATCH 3/3 new] KVM: x86 emulator: Use em_push() instead of emulate_push() Takuya Yoshikawa
  2011-04-13 11:08 ` [PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation Avi Kivity
  2 siblings, 0 replies; 5+ messages in thread
From: Takuya Yoshikawa @ 2011-04-12 15:29 UTC (permalink / raw)
  To: avi, mtosatti; +Cc: kvm, yoshikawa.takuya, gleb

From: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>

PUSH emulation stores the value by calling writeback() after setting
the dst operand appropriately in emulate_push().

This writeback() using dst is not needed at all because we know the
target is the stack.  So this patch makes emulate_push() call, newly
introduced, segmented_write() directly.

By this, many inlined writeback()'s are removed.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
---
 Changelog v1->v2: used segmented_write().

 arch/x86/kvm/emulate.c |   87 +++++++++++++++++++-----------------------------
 1 files changed, 34 insertions(+), 53 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index db48e91..a09c91f 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1345,17 +1345,19 @@ static inline int writeback(struct x86_emulate_ctxt *ctxt,
 	return X86EMUL_CONTINUE;
 }
 
-static inline void emulate_push(struct x86_emulate_ctxt *ctxt,
-				struct x86_emulate_ops *ops)
+static int emulate_push(struct x86_emulate_ctxt *ctxt,
+			struct x86_emulate_ops *ops)
 {
 	struct decode_cache *c = &ctxt->decode;
+	struct segmented_address addr;
 
-	c->dst.type  = OP_MEM;
-	c->dst.bytes = c->op_bytes;
-	c->dst.val = c->src.val;
 	register_address_increment(c, &c->regs[VCPU_REGS_RSP], -c->op_bytes);
-	c->dst.addr.mem.ea = register_address(c, c->regs[VCPU_REGS_RSP]);
-	c->dst.addr.mem.seg = VCPU_SREG_SS;
+	addr.ea = register_address(c, c->regs[VCPU_REGS_RSP]);
+	addr.seg = VCPU_SREG_SS;
+
+	/* Disable writeback. */
+	c->dst.type = OP_NONE;
+	return segmented_write(ctxt, addr, &c->src.val, c->op_bytes);
 }
 
 static int emulate_pop(struct x86_emulate_ctxt *ctxt,
@@ -1417,14 +1419,14 @@ static int emulate_popf(struct x86_emulate_ctxt *ctxt,
 	return rc;
 }
 
-static void emulate_push_sreg(struct x86_emulate_ctxt *ctxt,
-			      struct x86_emulate_ops *ops, int seg)
+static int emulate_push_sreg(struct x86_emulate_ctxt *ctxt,
+			     struct x86_emulate_ops *ops, int seg)
 {
 	struct decode_cache *c = &ctxt->decode;
 
 	c->src.val = ops->get_segment_selector(seg, ctxt->vcpu);
 
-	emulate_push(ctxt, ops);
+	return emulate_push(ctxt, ops);
 }
 
 static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt,
@@ -1454,18 +1456,13 @@ static int emulate_pusha(struct x86_emulate_ctxt *ctxt,
 		(reg == VCPU_REGS_RSP) ?
 		(c->src.val = old_esp) : (c->src.val = c->regs[reg]);
 
-		emulate_push(ctxt, ops);
-
-		rc = writeback(ctxt, ops);
+		rc = emulate_push(ctxt, ops);
 		if (rc != X86EMUL_CONTINUE)
 			return rc;
 
 		++reg;
 	}
 
-	/* Disable writeback. */
-	c->dst.type = OP_NONE;
-
 	return rc;
 }
 
@@ -1503,27 +1500,22 @@ int emulate_int_real(struct x86_emulate_ctxt *ctxt,
 
 	/* TODO: Add limit checks */
 	c->src.val = ctxt->eflags;
-	emulate_push(ctxt, ops);
-	rc = writeback(ctxt, ops);
+	rc = emulate_push(ctxt, ops);
 	if (rc != X86EMUL_CONTINUE)
 		return rc;
 
 	ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC);
 
 	c->src.val = ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu);
-	emulate_push(ctxt, ops);
-	rc = writeback(ctxt, ops);
+	rc = emulate_push(ctxt, ops);
 	if (rc != X86EMUL_CONTINUE)
 		return rc;
 
 	c->src.val = c->eip;
-	emulate_push(ctxt, ops);
-	rc = writeback(ctxt, ops);
+	rc = emulate_push(ctxt, ops);
 	if (rc != X86EMUL_CONTINUE)
 		return rc;
 
-	c->dst.type = OP_NONE;
-
 	ops->get_idt(&dt, ctxt->vcpu);
 
 	eip_addr = dt.address + (irq << 2);
@@ -1713,6 +1705,7 @@ static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
 			       struct x86_emulate_ops *ops)
 {
 	struct decode_cache *c = &ctxt->decode;
+	int rc = X86EMUL_CONTINUE;
 
 	switch (c->modrm_reg) {
 	case 0:	/* inc */
@@ -1726,17 +1719,17 @@ static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
 		old_eip = c->eip;
 		c->eip = c->src.val;
 		c->src.val = old_eip;
-		emulate_push(ctxt, ops);
+		rc = emulate_push(ctxt, ops);
 		break;
 	}
 	case 4: /* jmp abs */
 		c->eip = c->src.val;
 		break;
 	case 6:	/* push */
-		emulate_push(ctxt, ops);
+		rc = emulate_push(ctxt, ops);
 		break;
 	}
-	return X86EMUL_CONTINUE;
+	return rc;
 }
 
 static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt,
@@ -2380,7 +2373,7 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
 		c->op_bytes = c->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2;
 		c->lock_prefix = 0;
 		c->src.val = (unsigned long) error_code;
-		emulate_push(ctxt, ops);
+		ret = emulate_push(ctxt, ops);
 	}
 
 	return ret;
@@ -2400,11 +2393,8 @@ int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
 	rc = emulator_do_task_switch(ctxt, ops, tss_selector, reason,
 				     has_error_code, error_code);
 
-	if (rc == X86EMUL_CONTINUE) {
-		rc = writeback(ctxt, ops);
-		if (rc == X86EMUL_CONTINUE)
-			ctxt->eip = c->eip;
-	}
+	if (rc == X86EMUL_CONTINUE)
+		ctxt->eip = c->eip;
 
 	return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
 }
@@ -2422,8 +2412,7 @@ static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned seg,
 
 static int em_push(struct x86_emulate_ctxt *ctxt)
 {
-	emulate_push(ctxt, ctxt->ops);
-	return X86EMUL_CONTINUE;
+	return emulate_push(ctxt, ctxt->ops);
 }
 
 static int em_das(struct x86_emulate_ctxt *ctxt)
@@ -2483,20 +2472,12 @@ static int em_call_far(struct x86_emulate_ctxt *ctxt)
 	memcpy(&c->eip, c->src.valptr, c->op_bytes);
 
 	c->src.val = old_cs;
-	emulate_push(ctxt, ctxt->ops);
-	rc = writeback(ctxt, ctxt->ops);
+	rc = emulate_push(ctxt, ctxt->ops);
 	if (rc != X86EMUL_CONTINUE)
 		return rc;
 
 	c->src.val = old_eip;
-	emulate_push(ctxt, ctxt->ops);
-	rc = writeback(ctxt, ctxt->ops);
-	if (rc != X86EMUL_CONTINUE)
-		return rc;
-
-	c->dst.type = OP_NONE;
-
-	return X86EMUL_CONTINUE;
+	return emulate_push(ctxt, ctxt->ops);
 }
 
 static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
@@ -3625,7 +3606,7 @@ special_insn:
 		emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags);
 		break;
 	case 0x06:		/* push es */
-		emulate_push_sreg(ctxt, ops, VCPU_SREG_ES);
+		rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_ES);
 		break;
 	case 0x07:		/* pop es */
 		rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_ES);
@@ -3635,14 +3616,14 @@ special_insn:
 		emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);
 		break;
 	case 0x0e:		/* push cs */
-		emulate_push_sreg(ctxt, ops, VCPU_SREG_CS);
+		rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_CS);
 		break;
 	case 0x10 ... 0x15:
 	      adc:		/* adc */
 		emulate_2op_SrcV("adc", c->src, c->dst, ctxt->eflags);
 		break;
 	case 0x16:		/* push ss */
-		emulate_push_sreg(ctxt, ops, VCPU_SREG_SS);
+		rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_SS);
 		break;
 	case 0x17:		/* pop ss */
 		rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_SS);
@@ -3652,7 +3633,7 @@ special_insn:
 		emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags);
 		break;
 	case 0x1e:		/* push ds */
-		emulate_push_sreg(ctxt, ops, VCPU_SREG_DS);
+		rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_DS);
 		break;
 	case 0x1f:		/* pop ds */
 		rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_DS);
@@ -3789,7 +3770,7 @@ special_insn:
 		break;
 	case 0x9c: /* pushf */
 		c->src.val =  (unsigned long) ctxt->eflags;
-		emulate_push(ctxt, ops);
+		rc = emulate_push(ctxt, ops);
 		break;
 	case 0x9d: /* popf */
 		c->dst.type = OP_REG;
@@ -3864,7 +3845,7 @@ special_insn:
 		long int rel = c->src.val;
 		c->src.val = (unsigned long) c->eip;
 		jmp_rel(c, rel);
-		emulate_push(ctxt, ops);
+		rc = emulate_push(ctxt, ops);
 		break;
 	}
 	case 0xe9: /* jmp rel */
@@ -4157,7 +4138,7 @@ twobyte_insn:
 		c->dst.val = test_cc(c->b, ctxt->eflags);
 		break;
 	case 0xa0:	  /* push fs */
-		emulate_push_sreg(ctxt, ops, VCPU_SREG_FS);
+		rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_FS);
 		break;
 	case 0xa1:	 /* pop fs */
 		rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_FS);
@@ -4174,7 +4155,7 @@ twobyte_insn:
 		emulate_2op_cl("shld", c->src2, c->src, c->dst, ctxt->eflags);
 		break;
 	case 0xa8:	/* push gs */
-		emulate_push_sreg(ctxt, ops, VCPU_SREG_GS);
+		rc = emulate_push_sreg(ctxt, ops, VCPU_SREG_GS);
 		break;
 	case 0xa9:	/* pop gs */
 		rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_GS);
-- 
1.7.1


^ permalink raw reply related	[flat|nested] 5+ messages in thread

* [PATCH 3/3 new] KVM: x86 emulator: Use em_push() instead of emulate_push()
  2011-04-12 15:24 [PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation Takuya Yoshikawa
  2011-04-12 15:29 ` [PATCH 2/3 v2] KVM: x86 emulator: Make emulate_push() store the value directly Takuya Yoshikawa
@ 2011-04-12 15:31 ` Takuya Yoshikawa
  2011-04-13 11:08 ` [PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation Avi Kivity
  2 siblings, 0 replies; 5+ messages in thread
From: Takuya Yoshikawa @ 2011-04-12 15:31 UTC (permalink / raw)
  To: avi, mtosatti; +Cc: kvm, yoshikawa.takuya, gleb

From: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>

em_push() is a simple wrapper of emulate_push().  So this patch replaces
emulate_push() with em_push() and removes the unnecessary former.

In addition, the unused ops arguments are removed from emulate_pusha()
and emulate_grp45().

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
---
 arch/x86/kvm/emulate.c |   42 +++++++++++++++++-------------------------
 1 files changed, 17 insertions(+), 25 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index a09c91f..ef70af9 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1345,8 +1345,7 @@ static inline int writeback(struct x86_emulate_ctxt *ctxt,
 	return X86EMUL_CONTINUE;
 }
 
-static int emulate_push(struct x86_emulate_ctxt *ctxt,
-			struct x86_emulate_ops *ops)
+static int em_push(struct x86_emulate_ctxt *ctxt)
 {
 	struct decode_cache *c = &ctxt->decode;
 	struct segmented_address addr;
@@ -1426,7 +1425,7 @@ static int emulate_push_sreg(struct x86_emulate_ctxt *ctxt,
 
 	c->src.val = ops->get_segment_selector(seg, ctxt->vcpu);
 
-	return emulate_push(ctxt, ops);
+	return em_push(ctxt);
 }
 
 static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt,
@@ -1444,8 +1443,7 @@ static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt,
 	return rc;
 }
 
-static int emulate_pusha(struct x86_emulate_ctxt *ctxt,
-			  struct x86_emulate_ops *ops)
+static int emulate_pusha(struct x86_emulate_ctxt *ctxt)
 {
 	struct decode_cache *c = &ctxt->decode;
 	unsigned long old_esp = c->regs[VCPU_REGS_RSP];
@@ -1456,7 +1454,7 @@ static int emulate_pusha(struct x86_emulate_ctxt *ctxt,
 		(reg == VCPU_REGS_RSP) ?
 		(c->src.val = old_esp) : (c->src.val = c->regs[reg]);
 
-		rc = emulate_push(ctxt, ops);
+		rc = em_push(ctxt);
 		if (rc != X86EMUL_CONTINUE)
 			return rc;
 
@@ -1500,19 +1498,19 @@ int emulate_int_real(struct x86_emulate_ctxt *ctxt,
 
 	/* TODO: Add limit checks */
 	c->src.val = ctxt->eflags;
-	rc = emulate_push(ctxt, ops);
+	rc = em_push(ctxt);
 	if (rc != X86EMUL_CONTINUE)
 		return rc;
 
 	ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC);
 
 	c->src.val = ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu);
-	rc = emulate_push(ctxt, ops);
+	rc = em_push(ctxt);
 	if (rc != X86EMUL_CONTINUE)
 		return rc;
 
 	c->src.val = c->eip;
-	rc = emulate_push(ctxt, ops);
+	rc = em_push(ctxt);
 	if (rc != X86EMUL_CONTINUE)
 		return rc;
 
@@ -1701,8 +1699,7 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
 	return X86EMUL_CONTINUE;
 }
 
-static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
-			       struct x86_emulate_ops *ops)
+static int emulate_grp45(struct x86_emulate_ctxt *ctxt)
 {
 	struct decode_cache *c = &ctxt->decode;
 	int rc = X86EMUL_CONTINUE;
@@ -1719,14 +1716,14 @@ static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
 		old_eip = c->eip;
 		c->eip = c->src.val;
 		c->src.val = old_eip;
-		rc = emulate_push(ctxt, ops);
+		rc = em_push(ctxt);
 		break;
 	}
 	case 4: /* jmp abs */
 		c->eip = c->src.val;
 		break;
 	case 6:	/* push */
-		rc = emulate_push(ctxt, ops);
+		rc = em_push(ctxt);
 		break;
 	}
 	return rc;
@@ -2373,7 +2370,7 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
 		c->op_bytes = c->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2;
 		c->lock_prefix = 0;
 		c->src.val = (unsigned long) error_code;
-		ret = emulate_push(ctxt, ops);
+		ret = em_push(ctxt);
 	}
 
 	return ret;
@@ -2410,11 +2407,6 @@ static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned seg,
 	op->addr.mem.seg = seg;
 }
 
-static int em_push(struct x86_emulate_ctxt *ctxt)
-{
-	return emulate_push(ctxt, ctxt->ops);
-}
-
 static int em_das(struct x86_emulate_ctxt *ctxt)
 {
 	struct decode_cache *c = &ctxt->decode;
@@ -2472,12 +2464,12 @@ static int em_call_far(struct x86_emulate_ctxt *ctxt)
 	memcpy(&c->eip, c->src.valptr, c->op_bytes);
 
 	c->src.val = old_cs;
-	rc = emulate_push(ctxt, ctxt->ops);
+	rc = em_push(ctxt);
 	if (rc != X86EMUL_CONTINUE)
 		return rc;
 
 	c->src.val = old_eip;
-	return emulate_push(ctxt, ctxt->ops);
+	return em_push(ctxt);
 }
 
 static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
@@ -3666,7 +3658,7 @@ special_insn:
 		rc = emulate_pop(ctxt, ops, &c->dst.val, c->op_bytes);
 		break;
 	case 0x60:	/* pusha */
-		rc = emulate_pusha(ctxt, ops);
+		rc = emulate_pusha(ctxt);
 		break;
 	case 0x61:	/* popa */
 		rc = emulate_popa(ctxt, ops);
@@ -3770,7 +3762,7 @@ special_insn:
 		break;
 	case 0x9c: /* pushf */
 		c->src.val =  (unsigned long) ctxt->eflags;
-		rc = emulate_push(ctxt, ops);
+		rc = em_push(ctxt);
 		break;
 	case 0x9d: /* popf */
 		c->dst.type = OP_REG;
@@ -3845,7 +3837,7 @@ special_insn:
 		long int rel = c->src.val;
 		c->src.val = (unsigned long) c->eip;
 		jmp_rel(c, rel);
-		rc = emulate_push(ctxt, ops);
+		rc = em_push(ctxt);
 		break;
 	}
 	case 0xe9: /* jmp rel */
@@ -3923,7 +3915,7 @@ special_insn:
 		break;
 	case 0xfe: /* Grp4 */
 	grp45:
-		rc = emulate_grp45(ctxt, ops);
+		rc = emulate_grp45(ctxt);
 		break;
 	case 0xff: /* Grp5 */
 		if (c->modrm_reg == 5)
-- 
1.7.1


^ permalink raw reply related	[flat|nested] 5+ messages in thread

* Re: [PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation
  2011-04-12 15:24 [PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation Takuya Yoshikawa
  2011-04-12 15:29 ` [PATCH 2/3 v2] KVM: x86 emulator: Make emulate_push() store the value directly Takuya Yoshikawa
  2011-04-12 15:31 ` [PATCH 3/3 new] KVM: x86 emulator: Use em_push() instead of emulate_push() Takuya Yoshikawa
@ 2011-04-13 11:08 ` Avi Kivity
  2011-04-17  9:06   ` Avi Kivity
  2 siblings, 1 reply; 5+ messages in thread
From: Avi Kivity @ 2011-04-13 11:08 UTC (permalink / raw)
  To: Takuya Yoshikawa; +Cc: mtosatti, kvm, yoshikawa.takuya, gleb

On 04/12/2011 06:24 PM, Takuya Yoshikawa wrote:
> From: Takuya Yoshikawa<yoshikawa.takuya@oss.ntt.co.jp>
>
> This stops "CMP r/m, reg" to write back the data into memory.
> Pointed out by Avi.
>
> The writeback suppression now covers CMP, CMPS, SCAS.
>

Patchset looks good, nice cleanup.

-- 
error compiling committee.c: too many arguments to function


^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation
  2011-04-13 11:08 ` [PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation Avi Kivity
@ 2011-04-17  9:06   ` Avi Kivity
  0 siblings, 0 replies; 5+ messages in thread
From: Avi Kivity @ 2011-04-17  9:06 UTC (permalink / raw)
  To: Takuya Yoshikawa; +Cc: mtosatti, kvm, yoshikawa.takuya, gleb

On 04/13/2011 02:08 PM, Avi Kivity wrote:
> On 04/12/2011 06:24 PM, Takuya Yoshikawa wrote:
>> From: Takuya Yoshikawa<yoshikawa.takuya@oss.ntt.co.jp>
>>
>> This stops "CMP r/m, reg" to write back the data into memory.
>> Pointed out by Avi.
>>
>> The writeback suppression now covers CMP, CMPS, SCAS.
>>
>
> Patchset looks good, nice cleanup.
>

Now applied, thanks.

-- 
error compiling committee.c: too many arguments to function


^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2011-04-17  9:06 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-04-12 15:24 [PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation Takuya Yoshikawa
2011-04-12 15:29 ` [PATCH 2/3 v2] KVM: x86 emulator: Make emulate_push() store the value directly Takuya Yoshikawa
2011-04-12 15:31 ` [PATCH 3/3 new] KVM: x86 emulator: Use em_push() instead of emulate_push() Takuya Yoshikawa
2011-04-13 11:08 ` [PATCH 1/3 v2] KVM: x86 emulator: Disable writeback for CMP emulation Avi Kivity
2011-04-17  9:06   ` Avi Kivity

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