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Date: Wed, 25 Jun 2008 00:19:27 -0400
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Ingo Molnar <mingo@...e.hu>
Cc: LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
xen-devel <xen-devel@...ts.xensource.com>,
Stephen Tweedie <sct@...hat.com>,
Eduardo Habkost <ehabkost@...hat.com>,
Mark McLoughlin <markmc@...hat.com>, x86@...nel.org
Subject: [PATCH 31 of 36] x86_64 pvops: don't restore user rsp within sysret
There's no need to combine restoring the user rsp within the sysret
pvop, so split it out. This makes the pvop's semantics closer to the
machine instruction.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...irx.com>
---
arch/x86/kernel/asm-offsets_64.c | 2 +-
arch/x86/kernel/entry_64.S | 6 +++---
arch/x86/kernel/paravirt.c | 6 +++---
arch/x86/kernel/paravirt_patch_64.c | 4 ++--
include/asm-x86/irqflags.h | 3 +--
include/asm-x86/paravirt.h | 8 ++++----
6 files changed, 14 insertions(+), 15 deletions(-)
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -63,7 +63,7 @@
OFFSET(PV_IRQ_irq_enable, pv_irq_ops, irq_enable);
OFFSET(PV_CPU_iret, pv_cpu_ops, iret);
OFFSET(PV_CPU_nmi_return, pv_cpu_ops, nmi_return);
- OFFSET(PV_CPU_usersp_sysret, pv_cpu_ops, usersp_sysret);
+ OFFSET(PV_CPU_usergs_sysret, pv_cpu_ops, usergs_sysret);
OFFSET(PV_CPU_swapgs, pv_cpu_ops, swapgs);
OFFSET(PV_MMU_read_cr2, pv_mmu_ops, read_cr2);
#endif
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -167,8 +167,7 @@
#endif
#ifdef CONFIG_PARAVIRT
-ENTRY(native_usersp_sysret)
- movq %gs:pda_oldrsp,%rsp
+ENTRY(native_usergs_sysret)
swapgs
sysretq
#endif /* CONFIG_PARAVIRT */
@@ -383,7 +382,8 @@
CFI_REGISTER rip,rcx
RESTORE_ARGS 0,-ARG_SKIP,1
/*CFI_REGISTER rflags,r11*/
- USERSP_SYSRET
+ movq %gs:pda_oldrsp, %rsp
+ USERGS_SYSRET
CFI_RESTORE_STATE
/* Handle reschedules */
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -142,7 +142,7 @@
else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) ||
type == PARAVIRT_PATCH(pv_cpu_ops.nmi_return) ||
type == PARAVIRT_PATCH(pv_cpu_ops.irq_enable_sysexit) ||
- type == PARAVIRT_PATCH(pv_cpu_ops.usersp_sysret))
+ type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret))
/* If operation requires a jmp, then jmp */
ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
else
@@ -195,7 +195,7 @@
extern void native_iret(void);
extern void native_nmi_return(void);
extern void native_irq_enable_sysexit(void);
-extern void native_usersp_sysret(void);
+extern void native_usergs_sysret(void);
static int __init print_banner(void)
{
@@ -334,7 +334,7 @@
#ifdef CONFIG_X86_32
.irq_enable_sysexit = native_irq_enable_sysexit,
#else
- .usersp_sysret = native_usersp_sysret,
+ .usergs_sysret = native_usergs_sysret,
#endif
.iret = native_iret,
.nmi_return = native_nmi_return,
diff --git a/arch/x86/kernel/paravirt_patch_64.c b/arch/x86/kernel/paravirt_patch_64.c
--- a/arch/x86/kernel/paravirt_patch_64.c
+++ b/arch/x86/kernel/paravirt_patch_64.c
@@ -18,7 +18,7 @@
DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");
/* the three commands give us more control to how to return from a syscall */
-DEF_NATIVE(pv_cpu_ops, usersp_sysret, "movq %gs:" __stringify(pda_oldrsp) ", %rsp; swapgs; sysretq;");
+DEF_NATIVE(pv_cpu_ops, usergs_sysret, "swapgs; sysretq;");
DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");
unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
@@ -39,7 +39,7 @@
PATCH_SITE(pv_irq_ops, irq_disable);
PATCH_SITE(pv_cpu_ops, iret);
PATCH_SITE(pv_cpu_ops, nmi_return);
- PATCH_SITE(pv_cpu_ops, usersp_sysret);
+ PATCH_SITE(pv_cpu_ops, usergs_sysret);
PATCH_SITE(pv_cpu_ops, swapgs);
PATCH_SITE(pv_mmu_ops, read_cr2);
PATCH_SITE(pv_mmu_ops, read_cr3);
diff --git a/include/asm-x86/irqflags.h b/include/asm-x86/irqflags.h
--- a/include/asm-x86/irqflags.h
+++ b/include/asm-x86/irqflags.h
@@ -168,8 +168,7 @@
#ifdef CONFIG_X86_64
#define INTERRUPT_RETURN iretq
-#define USERSP_SYSRET \
- movq %gs:pda_oldrsp, %rsp; \
+#define USERGS_SYSRET \
swapgs; \
sysretq;
#else
diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -143,7 +143,7 @@
/* These ones are jmp'ed to, not actually called. */
void (*irq_enable_sysexit)(void);
- void (*usersp_sysret)(void);
+ void (*usergs_sysret)(void);
void (*iret)(void);
void (*nmi_return)(void);
@@ -1510,10 +1510,10 @@
movq %rax, %rcx; \
xorq %rax, %rax;
-#define USERSP_SYSRET \
- PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usersp_sysret), \
+#define USERGS_SYSRET \
+ PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret), \
CLBR_NONE, \
- jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usersp_sysret))
+ jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret))
#endif
#endif /* __ASSEMBLY__ */
--
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