perf/x86/amd: Don't touch the AMD64_EVENTSEL_HOSTONLY bit inside the guest
commit df51fe7e upstream. If we use "perf record" in an AMD Milan guest, dmesg reports a #GP warning from an unchecked MSR access error on MSR_F15H_PERF_CTLx: [] unchecked MSR access error: WRMSR to 0xc0010200 (tried to write 0x0000020000110076) at rIP: 0xffffffff8106ddb4 (native_write_msr+0x4/0x20) [] Call Trace: [] amd_pmu_disable_event+0x22/0x90 [] x86_pmu_stop+0x4c/0xa0 [] x86_pmu_del+0x3a/0x140 The AMD64_EVENTSEL_HOSTONLY bit is defined and used on the host, while the guest perf driver should avoid such use. Fixes: 1018faa6 ("perf/x86/kvm: Fix Host-Only/Guest-Only counting with SVM disabled") Signed-off-by:Like Xu <likexu@tencent.com> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by:
Liam Merwick <liam.merwick@oracle.com> Tested-by:
Kim Phillips <kim.phillips@amd.com> Tested-by:
Liam Merwick <liam.merwick@oracle.com> Link: https://lkml.kernel.org/r/20210802070850.35295-1-likexu@tencent.com Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
parent
683b47d0
Please register or sign in to comment