Sean Christopherson c8e2fe13d1 x86/perf: Use RET0 as default for guest_get_msrs to handle "no PMU" case ... Initialize x86_pmu.guest_get_msrs to return 0/NULL to handle the "nop" case. Patching in perf_guest_get_msrs_nop() during setup does not work if there is no PMU, as setup bails before updating the static calls, leaving x86_pmu.guest_get_msrs NULL and thus a complete nop. Ultimately, this causes VMX abort on VM-Exit due to KVM putting random garbage from the stack into the MSR load list. Add a comment in KVM to note that nr_msrs is valid if and only if the return value is non-NULL. Fixes: abd562df94 ("x86/perf: Use static_call for x86_pmu.guest_get_msrs") Reported-by: Dmitry Vyukov <dvyukov@google.com> Reported-by: syzbot+cce9ef2dd25246f815ee@syzkaller.appspotmail.com Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210309171019.1125243-1-seanjc@google.com		2021-03-10 16:45:09 +01:00
..
amd	x86/CPU/AMD: Remove amd_get_nb_id()	2020-11-19 11:43:17 +01:00
intel	perf/x86/intel: Set PERF_ATTACH_SCHED_CB for large PEBS and LBR	2021-03-06 12:52:44 +01:00
zhaoxin	x86/perf: Fix a typo	2020-07-22 10:22:08 +02:00
core.c	x86/perf: Use RET0 as default for guest_get_msrs to handle "no PMU" case	2021-03-10 16:45:09 +01:00
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile	perf/x86/rapl: Fix RAPL config variable bug	2020-06-02 11:52:56 +02:00
msr.c	perf/x86/msr: Add Rocket Lake CPU support	2020-10-29 11:00:40 +01:00
perf_event.h	perf/x86/intel: Support CPUID 10.ECX to disable fixed counters	2021-02-01 15:31:37 +01:00
probe.c	perf/x86/rapl: Add msr mask support	2021-02-10 14:44:54 +01:00
probe.h	perf/x86/rapl: Add msr mask support	2021-02-10 14:44:54 +01:00
rapl.c	perf/x86/rapl: Fix psys-energy event on Intel SPR platform	2021-02-10 14:44:55 +01:00