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target/arm: clear PMUVER field of AA64DFR0 when vPMU=off

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The PMUv3 driver of linux kernel (in arch/arm64/kernel/perf_event.c)
relies on the PMUVER field of id_aa64dfr0_el1 to decide if PMU support
is present or not. This patch clears the PMUVER field under TCG mode
when vPMU=off. Without it, PMUv3 will init insider guest VMs even
with vPMU=off. This patch also removes a redundant line inside the
if-statement.

Backports commit 2b3ffa929249b15a75d8bde3e8e57a744f52aff0 from qemu
This commit is contained in:
Wei Huang 2018-03-02 15:34:19 -05:00 committed by Lioncash
parent 4789e49c4d
commit 19335c32c9
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 1 additions and 1 deletions
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2
qemu/target/arm/cpu.c
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@ -561,8 +561,8 @@ static int arm_cpu_realizefn(struct uc_struct *uc, DeviceState *dev, Error **err
}
if (!cpu->has_pmu) {
cpu->has_pmu = false;
unset_feature(env, ARM_FEATURE_PMU);
cpu->id_aa64dfr0 &= ~0xf00;
}
if (!arm_feature(env, ARM_FEATURE_EL2)) {