x86/msr: Carry on after a non-"safe" MSR access fails

[cascardo/linux.git] / arch / x86 / include / asm / msr.h

diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 7a79ee2..25f169c 100644 (file)
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -84,7 +84,10 @@ static inline unsigned long long native_read_msr(unsigned int msr)
 {
        DECLARE_ARGS(val, low, high);
 
-       asm volatile("rdmsr" : EAX_EDX_RET(val, low, high) : "c" (msr));
+       asm volatile("1: rdmsr\n"
+                    "2:\n"
+                    _ASM_EXTABLE_HANDLE(1b, 2b, ex_handler_rdmsr_unsafe)
+                    : EAX_EDX_RET(val, low, high) : "c" (msr));
        if (msr_tracepoint_active(__tracepoint_read_msr))
                do_trace_read_msr(msr, EAX_EDX_VAL(val, low, high), 0);
        return EAX_EDX_VAL(val, low, high);
@@ -111,7 +114,10 @@ static inline unsigned long long native_read_msr_safe(unsigned int msr,
 static inline void native_write_msr(unsigned int msr,
                                    unsigned low, unsigned high)
 {
-       asm volatile("wrmsr" : : "c" (msr), "a"(low), "d" (high) : "memory");
+       asm volatile("1: wrmsr\n"
+                    "2:\n"
+                    _ASM_EXTABLE_HANDLE(1b, 2b, ex_handler_wrmsr_unsafe)
+                    : : "c" (msr), "a"(low), "d" (high) : "memory");
        if (msr_tracepoint_active(__tracepoint_read_msr))
                do_trace_write_msr(msr, ((u64)high << 32 | low), 0);
 }