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| author | Andy Lutomirski <luto@kernel.org> | 2016-04-02 07:01:39 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-04-13 11:37:46 +0200 |
| commit | 4985ce15a397e9b6541548efe3b9ffac2dda9127 (patch) | |
| tree | 4d05d1c37144934aaf948ab65585ad60aecba908 /arch/x86/include/asm/paravirt.h | |
| parent | dd2f4a004b016bbfb64f1de49cb45e66232e40a6 (diff) | |
| download | linux-0-day-4985ce15a397e9b6541548efe3b9ffac2dda9127.tar.gz linux-0-day-4985ce15a397e9b6541548efe3b9ffac2dda9127.tar.xz | |
x86/paravirt: Make "unsafe" MSR accesses unsafe even if PARAVIRT=y
Enabling CONFIG_PARAVIRT had an unintended side effect: rdmsr() turned
into rdmsr_safe() and wrmsr() turned into wrmsr_safe(), even on bare
metal. Undo that by using the new unsafe paravirt MSR callbacks.
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: KVM list <kvm@vger.kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel <Xen-devel@lists.xen.org>
Link: http://lkml.kernel.org/r/414fabd6d3527703077c6c2a797223d0a9c3b081.1459605520.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/paravirt.h')
| -rw-r--r-- | arch/x86/include/asm/paravirt.h | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h index 97839fa8b8aae..3c731413f1dee 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -152,24 +152,21 @@ static inline int paravirt_write_msr_safe(unsigned msr, return PVOP_CALL3(int, pv_cpu_ops.write_msr_safe, msr, low, high); } -/* These should all do BUG_ON(_err), but our headers are too tangled. */ #define rdmsr(msr, val1, val2) \ do { \ - int _err; \ - u64 _l = paravirt_read_msr_safe(msr, &_err); \ + u64 _l = paravirt_read_msr(msr); \ val1 = (u32)_l; \ val2 = _l >> 32; \ } while (0) #define wrmsr(msr, val1, val2) \ do { \ - paravirt_write_msr_safe(msr, val1, val2); \ + paravirt_write_msr(msr, val1, val2); \ } while (0) #define rdmsrl(msr, val) \ do { \ - int _err; \ - val = paravirt_read_msr_safe(msr, &_err); \ + val = paravirt_read_msr(msr); \ } while (0) static inline void wrmsrl(unsigned msr, u64 val) |