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| author | Jan Dakinevich | 2017-12-27 15:04:26 +0100 |
|---|---|---|
| committer | Paolo Bonzini | 2018-01-12 13:22:02 +0100 |
| commit | 0b368a10c71af96f6cf93b0ba5c2ee3bdbd50e96 (patch) | |
| tree | 3c855ef8c583e7f31d9cf1ae164b122e9e5c3b74 /chardev | |
| parent | hpet: recover timer offset correctly (diff) | |
| download | qemu-0b368a10c71af96f6cf93b0ba5c2ee3bdbd50e96.tar.gz qemu-0b368a10c71af96f6cf93b0ba5c2ee3bdbd50e96.tar.xz qemu-0b368a10c71af96f6cf93b0ba5c2ee3bdbd50e96.zip | |
i386/cpu/kvm: look at PMU's CPUID before setting MSRs
Certain PMU-related MSRs are not supported for CPUs with PMU
architecture below version 2. KVM rejects any access to them (see
intel_is_valid_msr_idx routine in KVM), and QEMU fails on the following
assertion:
kvm_put_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.
QEMU also could fail if KVM exposes less fixed counters then 3. It could
happen if host system run inside another hypervisor, which is tweaking
PMU-related CPUID. To prevent possible fail, number of fixed counters now is
obtained in the same way as number of GP counters.
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Jan Dakinevich <jan.dakinevich@virtuozzo.com>
Message-Id: <1514383466-7257-1-git-send-email-jan.dakinevich@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'chardev')
0 files changed, 0 insertions, 0 deletions