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| author | Andy Lutomirski <luto@kernel.org> | 2016-04-02 07:01:37 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-04-13 11:37:45 +0200 |
| commit | fbd704374d111bed16a19261176fa30e2379c87c (patch) | |
| tree | 8b1de7476a88eae86f76dc929c37e5a129c94e6c /arch/x86/kernel/paravirt.c | |
| parent | c2ee03b2a94d7ba692cf6206bbe069d5bfcc20ed (diff) | |
| download | op-kernel-dev-fbd704374d111bed16a19261176fa30e2379c87c.zip op-kernel-dev-fbd704374d111bed16a19261176fa30e2379c87c.tar.gz | |
x86/msr: Carry on after a non-"safe" MSR access fails
This demotes an OOPS and likely panic due to a failed non-"safe" MSR
access to a WARN_ONCE() and, for RDMSR, a return value of zero.
To be clear, this type of failure should *not* happen. This patch
exists to minimize the chance of nasty undebuggable failures
happening when a CONFIG_PARAVIRT=y bug in the non-"safe" MSR helpers
gets fixed.
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/26567b216aae70e795938f4b567eace5a0eb90ba.1459605520.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/paravirt.c')
0 files changed, 0 insertions, 0 deletions
