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SubjectRe: [PATCH 01/22] x86: add methods for writing of an MSR on several CPUs
Hi,

On Fri, May 15, 2009 at 02:22:12PM +0200, Borislav Petkov wrote:
> Add a struct representing a 64bit MSR pair consisting of a low and high
> register part.
>
> Also, rename msr-on-cpu.c to msr.c accordingly.
>
> Reviewed-by: Mauro Carvalho Chehab <mchehab@redhat.com>
> CC: H. Peter Anvin <hpa@zytor.com>
> Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

here's an updated version of the patch fixing a linux-next allmodconfig build
issue.

Peter, let me know in case there are any objections.

Thanks.

--

From: Borislav Petkov <borislav.petkov@amd.com>
Date: Wed, 29 Apr 2009 15:20:11 +0200
Subject: [PATCH UPDATED 01/22] x86: add methods for writing of an MSR on several CPUs

Add a struct representing a 64bit MSR pair consisting of a low and high
register part.

Also, rename msr-on-cpu.c to msr.c accordingly.

Finally, put the cpumask.h include in __KERNEL__ space and thus fix a
allmodconfig build failure in the headers_check target. Fix a bunch of
checkpatch issues, while at it.

Reviewed-by: Mauro Carvalho Chehab <mchehab@redhat.com>
CC: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
---
arch/x86/include/asm/msr.h | 23 +++++++
arch/x86/lib/Makefile | 2 +-
arch/x86/lib/msr-on-cpu.c | 97 ----------------------------
arch/x86/lib/msr.c | 151 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 175 insertions(+), 98 deletions(-)
delete mode 100644 arch/x86/lib/msr-on-cpu.c
create mode 100644 arch/x86/lib/msr.c
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 638bf62..e49c14e 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -12,6 +12,17 @@

#include <asm/asm.h>
#include <asm/errno.h>
+#include <asm/cpumask.h>
+
+struct msr {
+ union {
+ struct {
+ u32 l;
+ u32 h;
+ };
+ u64 q;
+ };
+};

static inline unsigned long long native_read_tscp(unsigned int *aux)
{
@@ -216,6 +227,8 @@ do { \
#ifdef CONFIG_SMP
int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
+int rdmsr_on_cpus(const cpumask_t *mask, u32 msr_no, struct msr *msrs);
+int 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);
#else /* CONFIG_SMP */
@@ -229,6 +242,16 @@ static inline int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
wrmsr(msr_no, l, h);
return 0;
}
+static inline int rdmsr_on_cpus(const cpumask_t *m, u32 msr_no,
+ struct msr **msrs)
+{
+ return rdmsr_on_cpu(msr_no, &(msrs[0].l), &(msrs[0].h));
+}
+static inline int wrmsr_on_cpus(const cpumask_t *m, u32 msr_no,
+ struct msr **msrs)
+{
+ return wrmsr_on_cpu(msr_no, msrs[0].l, msrs[0].h);
+}
static inline int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no,
u32 *l, u32 *h)
{
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index 55e11aa..f9d3563 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -2,7 +2,7 @@
# Makefile for x86 specific library files.
#

-obj-$(CONFIG_SMP) := msr-on-cpu.o
+obj-$(CONFIG_SMP) := msr.o

lib-y := delay.o
lib-y += thunk_$(BITS).o
diff --git a/arch/x86/lib/msr-on-cpu.c b/arch/x86/lib/msr-on-cpu.c
deleted file mode 100644
index 321cf72..0000000
--- a/arch/x86/lib/msr-on-cpu.c
+++ /dev/null
@@ -1,97 +0,0 @@
-#include <linux/module.h>
-#include <linux/preempt.h>
-#include <linux/smp.h>
-#include <asm/msr.h>
-
-struct msr_info {
- u32 msr_no;
- u32 l, h;
- int err;
-};
-
-static void __rdmsr_on_cpu(void *info)
-{
- struct msr_info *rv = info;
-
- rdmsr(rv->msr_no, rv->l, rv->h);
-}
-
-static void __wrmsr_on_cpu(void *info)
-{
- struct msr_info *rv = info;
-
- wrmsr(rv->msr_no, rv->l, rv->h);
-}
-
-int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
-{
- int err;
- struct msr_info rv;
-
- rv.msr_no = msr_no;
- err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
- *l = rv.l;
- *h = rv.h;
-
- return err;
-}
-
-int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
-{
- int err;
- struct msr_info rv;
-
- rv.msr_no = msr_no;
- rv.l = l;
- rv.h = h;
- err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);
-
- return err;
-}
-
-/* These "safe" variants are slower and should be used when the target MSR
- may not actually exist. */
-static void __rdmsr_safe_on_cpu(void *info)
-{
- struct msr_info *rv = info;
-
- rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h);
-}
-
-static void __wrmsr_safe_on_cpu(void *info)
-{
- struct msr_info *rv = info;
-
- rv->err = wrmsr_safe(rv->msr_no, rv->l, rv->h);
-}
-
-int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
-{
- int err;
- struct msr_info rv;
-
- rv.msr_no = msr_no;
- err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
- *l = rv.l;
- *h = rv.h;
-
- return err ? err : rv.err;
-}
-
-int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
-{
- int err;
- struct msr_info rv;
-
- rv.msr_no = msr_no;
- rv.l = l;
- rv.h = h;
- err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);
-
- return err ? err : rv.err;
-}
-
-EXPORT_SYMBOL(rdmsr_on_cpu);
-EXPORT_SYMBOL(wrmsr_on_cpu);
-EXPORT_SYMBOL(rdmsr_safe_on_cpu);
-EXPORT_SYMBOL(wrmsr_safe_on_cpu);
diff --git a/arch/x86/lib/msr.c b/arch/x86/lib/msr.c
new file mode 100644
index 0000000..774dc29
--- /dev/null
+++ b/arch/x86/lib/msr.c
@@ -0,0 +1,151 @@
+#include <linux/module.h>
+#include <linux/preempt.h>
+#include <linux/smp.h>
+#include <asm/msr.h>
+
+struct msr_info {
+ u32 msr_no;
+ u32 l, h;
+ int err;
+};
+
+static void __rdmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ rdmsr(rv->msr_no, rv->l, rv->h);
+}
+
+static void __wrmsr_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ wrmsr(rv->msr_no, rv->l, rv->h);
+}
+
+int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ int err;
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
+ *l = rv.l;
+ *h = rv.h;
+
+ return err;
+}
+EXPORT_SYMBOL(rdmsr_on_cpu);
+
+int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ int err;
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ rv.l = l;
+ rv.h = h;
+ err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);
+
+ return err;
+}
+EXPORT_SYMBOL(wrmsr_on_cpu);
+
+/* rdmsr on a bunch of CPUs
+ *
+ * @mask: which CPUs
+ * @msr_no: which MSR
+ * @msrs: array of MSR values
+ *
+ * Returns:
+ * 0 - success
+ * <0 - read failed on at least one CPU (latter in the mask)
+ */
+int rdmsr_on_cpus(const cpumask_t *mask, u32 msr_no, struct msr *msrs)
+{
+ struct msr *reg;
+ int cpu, tmp, err = 0;
+ int off = cpumask_first(mask);
+
+ for_each_cpu(cpu, mask) {
+ reg = &msrs[cpu - off];
+
+ tmp = rdmsr_on_cpu(cpu, msr_no, &reg->l, &reg->h);
+ if (tmp)
+ err = tmp;
+ }
+ return err;
+}
+EXPORT_SYMBOL(rdmsr_on_cpus);
+
+/*
+ * wrmsr of a bunch of CPUs
+ *
+ * @mask: which CPUs
+ * @msr_no: which MSR
+ * @msrs: array of MSR values
+ *
+ * Returns:
+ * 0 - success
+ * <0 - write failed on at least one CPU (latter in the mask)
+ */
+int wrmsr_on_cpus(const cpumask_t *mask, u32 msr_no, struct msr *msrs)
+{
+ struct msr reg;
+ int cpu, tmp, err = 0;
+ int off = cpumask_first(mask);
+
+ for_each_cpu(cpu, mask) {
+ reg = msrs[cpu - off];
+
+ tmp = wrmsr_on_cpu(cpu, msr_no, reg.l, reg.h);
+ if (tmp)
+ err = tmp;
+ }
+ return err;
+}
+EXPORT_SYMBOL(wrmsr_on_cpus);
+
+/* These "safe" variants are slower and should be used when the target MSR
+ may not actually exist. */
+static void __rdmsr_safe_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h);
+}
+
+static void __wrmsr_safe_on_cpu(void *info)
+{
+ struct msr_info *rv = info;
+
+ rv->err = wrmsr_safe(rv->msr_no, rv->l, rv->h);
+}
+
+int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+ int err;
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
+ *l = rv.l;
+ *h = rv.h;
+
+ return err ? err : rv.err;
+}
+EXPORT_SYMBOL(rdmsr_safe_on_cpu);
+
+int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+ int err;
+ struct msr_info rv;
+
+ rv.msr_no = msr_no;
+ rv.l = l;
+ rv.h = h;
+ err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);
+
+ return err ? err : rv.err;
+}
+EXPORT_SYMBOL(wrmsr_safe_on_cpu);
--
1.6.2.4

--
Regards/Gruss,
Boris.

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