Re: [Xen-devel] Re: [PATCH] xen: Disable stack protector for irq helper

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 10/12/09 13:52, Ingo Molnar wrote:
> ping - any update about this fix? Since it fixes a real crash it would 
> be nice to fix this for .32.
>   

The following changes since commit 2caa731819a633bec5a56736e64c562b7e193666:
  Linus Torvalds (1):
        Merge branch 'for-linus' of git://git.kernel.org/.../jbarnes/pci-2.6

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git 
mainline/x86-paravirt-fix

Jeremy Fitzhardinge (1):
      x86/paravirt: use normal calling sequences for irq enable/disable etc

 arch/x86/include/asm/paravirt.h       |   28 ++++------------------------
 arch/x86/include/asm/paravirt_types.h |   10 ++++++----
 2 files changed, 10 insertions(+), 28 deletions(-)

Subject: [PATCH] x86/paravirt: use normal calling sequences for irq 
enable/disable etc

For historical reasons irq enable/disable/save/restore had special
calling sequences to make them more efficient.  With the more
recent introduction of higher-level and more general optimisations
this is no longer necessary so we can just use the normal PVOP_
macros.  This fixes some residual bugs in the old implementations which
left edx liable to inadvertent clobbering.

Also, fix some bugs in __PVOP_VCALLEESAVE which were revealed by actual
use.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 8aebcc4..efb3899 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -840,42 +840,22 @@ static __always_inline void __raw_spin_unlock(struct 
raw_spinlock *lock)
 
 static inline unsigned long __raw_local_save_flags(void)
 {
-       unsigned long f;
-
-       asm volatile(paravirt_alt(PARAVIRT_CALL)
-                    : "=a"(f)
-                    : paravirt_type(pv_irq_ops.save_fl),
-                      paravirt_clobber(CLBR_EAX)
-                    : "memory", "cc");
-       return f;
+       return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
 }
 
 static inline void raw_local_irq_restore(unsigned long f)
 {
-       asm volatile(paravirt_alt(PARAVIRT_CALL)
-                    : "=a"(f)
-                    : PV_FLAGS_ARG(f),
-                      paravirt_type(pv_irq_ops.restore_fl),
-                      paravirt_clobber(CLBR_EAX)
-                    : "memory", "cc");
+       PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
 }
 
 static inline void raw_local_irq_disable(void)
 {
-       asm volatile(paravirt_alt(PARAVIRT_CALL)
-                    :
-                    : paravirt_type(pv_irq_ops.irq_disable),
-                      paravirt_clobber(CLBR_EAX)
-                    : "memory", "eax", "cc");
+       PVOP_VCALLEE0(pv_irq_ops.irq_disable);
 }
 
 static inline void raw_local_irq_enable(void)
 {
-       asm volatile(paravirt_alt(PARAVIRT_CALL)
-                    :
-                    : paravirt_type(pv_irq_ops.irq_enable),
-                      paravirt_clobber(CLBR_EAX)
-                    : "memory", "eax", "cc");
+       PVOP_VCALLEE0(pv_irq_ops.irq_enable);
 }
 
 static inline unsigned long __raw_local_irq_save(void)
diff --git a/arch/x86/include/asm/paravirt_types.h 
b/arch/x86/include/asm/paravirt_types.h
index dd0f5b3..9357473 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -494,10 +494,11 @@ int paravirt_disable_iospace(void);
 #define EXTRA_CLOBBERS
 #define VEXTRA_CLOBBERS
 #else  /* CONFIG_X86_64 */
+/* [re]ax isn't an arg, but the return val */
 #define PVOP_VCALL_ARGS                                        \
        unsigned long __edi = __edi, __esi = __esi,     \
-               __edx = __edx, __ecx = __ecx
-#define PVOP_CALL_ARGS         PVOP_VCALL_ARGS, __eax
+               __edx = __edx, __ecx = __ecx, __eax = __eax
+#define PVOP_CALL_ARGS         PVOP_VCALL_ARGS
 
 #define PVOP_CALL_ARG1(x)              "D" ((unsigned long)(x))
 #define PVOP_CALL_ARG2(x)              "S" ((unsigned long)(x))
@@ -509,6 +510,7 @@ int paravirt_disable_iospace(void);
                                "=c" (__ecx)
 #define PVOP_CALL_CLOBBERS     PVOP_VCALL_CLOBBERS, "=a" (__eax)
 
+/* void functions are still allowed [re]ax for scratch */
 #define PVOP_VCALLEE_CLOBBERS  "=a" (__eax)
 #define PVOP_CALLEE_CLOBBERS   PVOP_VCALLEE_CLOBBERS
 
@@ -583,8 +585,8 @@ int paravirt_disable_iospace(void);
                       VEXTRA_CLOBBERS,                                 \
                       pre, post, ##__VA_ARGS__)
 
-#define __PVOP_VCALLEESAVE(rettype, op, pre, post, ...)                        
\
-       ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
+#define __PVOP_VCALLEESAVE(op, pre, post, ...)                         \
+       ____PVOP_VCALL(op.func, CLBR_RET_REG,                           \
                      PVOP_VCALLEE_CLOBBERS, ,                          \
                      pre, post, ##__VA_ARGS__)



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