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| author | Vladimir Murzin <vladimir.murzin@arm.com> | 2016-08-10 10:49:42 +0100 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2016-08-17 12:46:21 +0200 |
| commit | b63bebe2355cf2632a2979fd2982c88d080c44b6 (patch) | |
| tree | d1739eb5e74cc7efe8e052dfb177080bf589e462 /arch/arm64 | |
| parent | cabdc5c59ab46a1ec5ea98c5ac4022111fbfd63a (diff) | |
| download | linux-stable-b63bebe2355cf2632a2979fd2982c88d080c44b6.tar.gz linux-stable-b63bebe2355cf2632a2979fd2982c88d080c44b6.tar.bz2 linux-stable-b63bebe2355cf2632a2979fd2982c88d080c44b6.zip | |
arm64: KVM: remove misleading comment on pmu status
Comment about how PMU access is handled is not relavant since v4.6
where proper PMU support was added in.
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kvm/sys_regs.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index b0b225ceca18..af5ea86d1c19 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -823,14 +823,6 @@ static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, * Architected system registers. * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2 * - * We could trap ID_DFR0 and tell the guest we don't support performance - * monitoring. Unfortunately the patch to make the kernel check ID_DFR0 was - * NAKed, so it will read the PMCR anyway. - * - * Therefore we tell the guest we have 0 counters. Unfortunately, we - * must always support PMCCNTR (the cycle counter): we just RAZ/WI for - * all PM registers, which doesn't crash the guest kernel at least. - * * Debug handling: We do trap most, if not all debug related system * registers. The implementation is good enough to ensure that a guest * can use these with minimal performance degradation. The drawback is |