diff options
| author | Like Xu <[email protected]> | 2021-04-30 13:22:46 +0800 |
|---|---|---|
| committer | Peter Zijlstra <[email protected]> | 2021-05-18 12:53:47 +0200 |
| commit | 3317c26a4b413b41364f2c4b83c778c6aba1576d (patch) | |
| tree | 0a52f5b6a64de2ed5b453505e9217f3ece67ab9f /drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | |
| parent | d07f6ca923ea0927a1024dfccafc5b53b61cfecc (diff) | |
perf/x86: Avoid touching LBR_TOS MSR for Arch LBR
The Architecture LBR does not have MSR_LBR_TOS (0x000001c9).
In a guest that should support Architecture LBR, check_msr()
will be a non-related check for the architecture MSR 0x0
(IA32_P5_MC_ADDR) that is also not supported by KVM.
The failure will cause x86_pmu.lbr_nr = 0, thereby preventing
the initialization of the guest Arch LBR. Fix it by avoiding
this extraneous check in intel_pmu_init() for Arch LBR.
Fixes: 47125db27e47 ("perf/x86/intel/lbr: Support Architectural LBR")
Signed-off-by: Like Xu <[email protected]>
[peterz: simpler still]
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_object.c')
0 files changed, 0 insertions, 0 deletions