From 78947e0e1ea012eee201684f2bc48fb914506f56 Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Mon, 31 Aug 2009 14:13:48 -0700
Subject: [PATCH] --- yaml --- r: 158695 b: refs/heads/master c:
 8b956bf1f0f2b552ed93cf6cafe823edff298b3b h: refs/heads/master i:   158693:
 621c15cef7a6e2efc3b0a4d3a5f27219ec5b4c27   158691:
 e3aae86975bf2488e4dcf8affe1b2b255027f529   158687:
 fa91f25c235731afcc7d236d3bce2cd2a822f60e v: v3

---
 [refs]                           |  2 +-
 trunk/arch/x86/include/asm/msr.h | 18 +++++++++---
 trunk/arch/x86/lib/msr.c         | 49 ++++++++++++++++++++++++++++++++
 3 files changed, 64 insertions(+), 5 deletions(-)

diff --git a/[refs] b/[refs]
index 090113ceae06..43139245012a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0cc0213e73af5963eca259c84876937c20689dbd
+refs/heads/master: 8b956bf1f0f2b552ed93cf6cafe823edff298b3b
diff --git a/trunk/arch/x86/include/asm/msr.h b/trunk/arch/x86/include/asm/msr.h
index 943fdd572e16..8e56712aa176 100644
--- a/trunk/arch/x86/include/asm/msr.h
+++ b/trunk/arch/x86/include/asm/msr.h
@@ -97,8 +97,8 @@ notrace static inline int native_write_msr_safe(unsigned int msr,
 
 extern unsigned long long native_read_tsc(void);
 
-extern int native_rdmsr_safe_regs(u32 *regs);
-extern int native_wrmsr_safe_regs(u32 *regs);
+extern int native_rdmsr_safe_regs(u32 regs[8]);
+extern int native_wrmsr_safe_regs(u32 regs[8]);
 
 static __always_inline unsigned long long __native_read_tsc(void)
 {
@@ -196,12 +196,12 @@ static inline int wrmsrl_amd_safe(unsigned msr, unsigned long long val)
 	return native_wrmsr_safe_regs(gprs);
 }
 
-static inline int rdmsr_safe_regs(u32 *regs)
+static inline int rdmsr_safe_regs(u32 regs[8])
 {
 	return native_rdmsr_safe_regs(regs);
 }
 
-static inline int wrmsr_safe_regs(u32 *regs)
+static inline int wrmsr_safe_regs(u32 regs[8])
 {
 	return native_wrmsr_safe_regs(regs);
 }
@@ -245,6 +245,8 @@ void rdmsr_on_cpus(const cpumask_t *mask, u32 msr_no, struct msr *msrs);
 void wrmsr_on_cpus(const cpumask_t *mask, u32 msr_no, struct msr *msrs);
 int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
 int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
+int rdmsr_safe_regs_on_cpu(unsigned int cpu, u32 regs[8]);
+int wrmsr_safe_regs_on_cpu(unsigned int cpu, u32 regs[8]);
 #else  /*  CONFIG_SMP  */
 static inline int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
 {
@@ -275,6 +277,14 @@ static inline int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
 {
 	return wrmsr_safe(msr_no, l, h);
 }
+static inline int rdmsr_safe_regs_on_cpu(unsigned int cpu, u32 regs[8])
+{
+	return rdmsr_safe_regs(regs);
+}
+static inline int wrmsr_safe_regs_on_cpu(unsigned int cpu, u32 regs[8])
+{
+	return wrmsr_safe_regs(regs);
+}
 #endif  /* CONFIG_SMP */
 #endif /* __ASSEMBLY__ */
 #endif /* __KERNEL__ */
diff --git a/trunk/arch/x86/lib/msr.c b/trunk/arch/x86/lib/msr.c
index caa24aca8115..33a1e3ca22d8 100644
--- a/trunk/arch/x86/lib/msr.c
+++ b/trunk/arch/x86/lib/msr.c
@@ -175,3 +175,52 @@ int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
 	return err ? err : rv.err;
 }
 EXPORT_SYMBOL(wrmsr_safe_on_cpu);
+
+/*
+ * These variants are significantly slower, but allows control over
+ * the entire 32-bit GPR set.
+ */
+struct msr_regs_info {
+	u32 *regs;
+	int err;
+};
+
+static void __rdmsr_safe_regs_on_cpu(void *info)
+{
+	struct msr_regs_info *rv = info;
+
+	rv->err = rdmsr_safe_regs(rv->regs);
+}
+
+static void __wrmsr_safe_regs_on_cpu(void *info)
+{
+	struct msr_regs_info *rv = info;
+
+	rv->err = wrmsr_safe_regs(rv->regs);
+}
+
+int rdmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
+{
+	int err;
+	struct msr_regs_info rv;
+
+	rv.regs   = regs;
+	rv.err    = -EIO;
+	err = smp_call_function_single(cpu, __rdmsr_safe_regs_on_cpu, &rv, 1);
+
+	return err ? err : rv.err;
+}
+EXPORT_SYMBOL(rdmsr_safe_regs_on_cpu);
+
+int wrmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
+{
+	int err;
+	struct msr_regs_info rv;
+
+	rv.regs = regs;
+	rv.err  = -EIO;
+	err = smp_call_function_single(cpu, __wrmsr_safe_regs_on_cpu, &rv, 1);
+
+	return err ? err : rv.err;
+}
+EXPORT_SYMBOL(wrmsr_safe_regs_on_cpu);