c8e2fe13d1
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:
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|---|---|---|
| .. | ||
| amd | ||
| intel | ||
| zhaoxin | ||
| Kconfig | ||
| Makefile | ||
| core.c | ||
| msr.c | ||
| perf_event.h | ||
| probe.c | ||
| probe.h | ||
| rapl.c | ||