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Subject[PATCH 2/7] x86, smp: Adjust native_wbinvd for smp_call_function-helpers
Date
From: Borislav Petkov <borislav.petkov@amd.com>

Add a wbinvd_on_cpu() helper and fold the void * arg in the wbinvd macro
definition so that native_wbinvd can be used in the smp_call_function_*
helpers as a pointed-to function.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
---
arch/x86/include/asm/paravirt.h | 3 ++-
arch/x86/include/asm/paravirt_types.h | 2 +-
arch/x86/include/asm/smp.h | 3 +++
arch/x86/include/asm/system.h | 10 ++++++++--
arch/x86/lib/smp.c | 7 +++++++
5 files changed, 21 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index dd59a85..ee034a6 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -117,7 +117,8 @@ static inline void halt(void)

static inline void wbinvd(void)
{
- PVOP_VCALL0(pv_cpu_ops.wbinvd);
+ void *uninitialized_var(dummy_ptr);
+ PVOP_VCALL1(pv_cpu_ops.wbinvd, dummy_ptr);
}

#define get_kernel_rpl() (pv_info.kernel_rpl)
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index b1e70d5..79730b8 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -136,7 +136,7 @@ struct pv_cpu_ops {

void (*set_iopl_mask)(unsigned mask);

- void (*wbinvd)(void);
+ void (*wbinvd)(void *);
void (*io_delay)(void);

/* cpuid emulation, mostly so that caps bits can be disabled */
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 1e79678..090146e 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -138,6 +138,7 @@ void play_dead_common(void);

void native_send_call_func_ipi(const struct cpumask *mask);
void native_send_call_func_single_ipi(int cpu);
+void wbinvd_on_cpu(int cpu);

void smp_store_cpu_info(int id);
#define cpu_physical_id(cpu) per_cpu(x86_cpu_to_apicid, cpu)
@@ -147,6 +148,8 @@ static inline int num_booting_cpus(void)
{
return cpumask_weight(cpu_callout_mask);
}
+#else /* !CONFIG_SMP */
+#define wbinvd_on_cpu(cpu) wbinvd()
#endif /* CONFIG_SMP */

extern unsigned disabled_cpus __cpuinitdata;
diff --git a/arch/x86/include/asm/system.h b/arch/x86/include/asm/system.h
index ecb544e..8c531ab 100644
--- a/arch/x86/include/asm/system.h
+++ b/arch/x86/include/asm/system.h
@@ -297,7 +297,7 @@ static inline void native_write_cr8(unsigned long val)
}
#endif

-static inline void native_wbinvd(void)
+static inline void native_wbinvd(void *dummy)
{
asm volatile("wbinvd": : :"memory");
}
@@ -314,7 +314,13 @@ static inline void native_wbinvd(void)
#define read_cr4() (native_read_cr4())
#define read_cr4_safe() (native_read_cr4_safe())
#define write_cr4(x) (native_write_cr4(x))
-#define wbinvd() (native_wbinvd())
+
+#define wbinvd() \
+ ({ \
+ void *uninitialized_var(dumb_ptr); \
+ native_wbinvd(dumb_ptr); \
+ })
+
#ifdef CONFIG_X86_64
#define read_cr8() (native_read_cr8())
#define write_cr8(x) (native_write_cr8(x))
diff --git a/arch/x86/lib/smp.c b/arch/x86/lib/smp.c
index a6b1b86..408c3b7 100644
--- a/arch/x86/lib/smp.c
+++ b/arch/x86/lib/smp.c
@@ -2,6 +2,7 @@
#include <linux/preempt.h>
#include <linux/smp.h>
#include <asm/msr.h>
+#include <asm/system.h>

static void __rdmsr_on_cpu(void *info)
{
@@ -202,3 +203,9 @@ int wrmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
return err ? err : rv.err;
}
EXPORT_SYMBOL(wrmsr_safe_regs_on_cpu);
+
+void wbinvd_on_cpu(int cpu)
+{
+ smp_call_function_single(cpu, native_wbinvd, NULL, 1);
+}
+EXPORT_SYMBOL(wbinvd_on_cpu);
--
1.6.6


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