x86: MSR: add a struct representation of an MSR
Add a struct representing a 64bit MSR pair consisting of a low and high
register part and convert msr_info to use it. Also, rename msr-on-cpu.c
to msr.c.
Side note: Put the cpumask.h include in __KERNEL__ space thus fixing an
allmodconfig build failure in the headers_check target.
CC: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 638bf62..5e12132 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)
{
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.c
similarity index 81%
rename from arch/x86/lib/msr-on-cpu.c
rename to arch/x86/lib/msr.c
index 321cf72..cade714 100644
--- a/arch/x86/lib/msr-on-cpu.c
+++ b/arch/x86/lib/msr.c
@@ -5,7 +5,7 @@
struct msr_info {
u32 msr_no;
- u32 l, h;
+ struct msr reg;
int err;
};
@@ -13,14 +13,14 @@
{
struct msr_info *rv = info;
- rdmsr(rv->msr_no, rv->l, rv->h);
+ rdmsr(rv->msr_no, rv->reg.l, rv->reg.h);
}
static void __wrmsr_on_cpu(void *info)
{
struct msr_info *rv = info;
- wrmsr(rv->msr_no, rv->l, rv->h);
+ wrmsr(rv->msr_no, rv->reg.l, rv->reg.h);
}
int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
@@ -30,8 +30,8 @@
rv.msr_no = msr_no;
err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
- *l = rv.l;
- *h = rv.h;
+ *l = rv.reg.l;
+ *h = rv.reg.h;
return err;
}
@@ -42,8 +42,8 @@
struct msr_info rv;
rv.msr_no = msr_no;
- rv.l = l;
- rv.h = h;
+ rv.reg.l = l;
+ rv.reg.h = h;
err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);
return err;
@@ -55,14 +55,14 @@
{
struct msr_info *rv = info;
- rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h);
+ rv->err = rdmsr_safe(rv->msr_no, &rv->reg.l, &rv->reg.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);
+ rv->err = wrmsr_safe(rv->msr_no, rv->reg.l, rv->reg.h);
}
int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
@@ -72,8 +72,8 @@
rv.msr_no = msr_no;
err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
- *l = rv.l;
- *h = rv.h;
+ *l = rv.reg.l;
+ *h = rv.reg.h;
return err ? err : rv.err;
}
@@ -84,8 +84,8 @@
struct msr_info rv;
rv.msr_no = msr_no;
- rv.l = l;
- rv.h = h;
+ rv.reg.l = l;
+ rv.reg.h = h;
err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);
return err ? err : rv.err;