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From: Auger Eric <eric.auger@redhat.com>
To: Marc Zyngier <maz@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Cc: James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	kernel-team@android.com
Subject: Re: [PATCH 2/6] KVM: arm64: Fix AArch32 PMUv3 capping
Date: Fri, 15 Jan 2021 14:05:16 +0100	[thread overview]
Message-ID: <444b17ec-e737-f6ae-400d-fd2142dfb175@redhat.com> (raw)
In-Reply-To: <20210114105633.2558739-3-maz@kernel.org>

Hi Marc,

On 1/14/21 11:56 AM, Marc Zyngier wrote:
> We shouldn't expose *any* PMU capability when no PMU has been
> configured for this VM.
> 
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> ---
>  arch/arm64/kvm/sys_regs.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index 0c0832472c4a..ce08d28ab15c 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -1048,8 +1048,8 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
>  	} else if (id == SYS_ID_DFR0_EL1) {
>  		/* Limit guests to PMUv3 for ARMv8.1 */
>  		val = cpuid_feature_cap_perfmon_field(val,
> -						ID_DFR0_PERFMON_SHIFT,
> -						ID_DFR0_PERFMON_8_1);
> +						      ID_DFR0_PERFMON_SHIFT,
> +						      kvm_vcpu_has_pmu(vcpu) ? ID_DFR0_PERFMON_8_1 : 0);
nit: Maybe you could use the same layout for SYS_ID_AA64DFR0_EL1
andremove cap there.

Reviewed-by: Eric Auger <eric.auger@redhat.com>

Eric



>  	}
>  
>  	return val;
> 


  reply	other threads:[~2021-01-15 13:07 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-14 10:56 [PATCH 0/6] KVM: arm64: More PMU/debug ID register fixes Marc Zyngier
2021-01-14 10:56 ` [PATCH 1/6] KVM: arm64: Fix missing RES1 in emulation of DBGBIDR Marc Zyngier
2021-01-15 13:05   ` Auger Eric
2021-01-14 10:56 ` [PATCH 2/6] KVM: arm64: Fix AArch32 PMUv3 capping Marc Zyngier
2021-01-15 13:05   ` Auger Eric [this message]
2021-01-14 10:56 ` [PATCH 3/6] KVM: arm64: Add handling of AArch32 PCMEID{2,3} PMUv3 registers Marc Zyngier
2021-01-15 13:04   ` Auger Eric
2021-01-14 10:56 ` [PATCH 4/6] KVM: arm64: Refactor filtering of ID registers Marc Zyngier
2021-01-15 13:31   ` Auger Eric
2021-01-14 10:56 ` [PATCH 5/6] KVM: arm64: Limit the debug architecture to ARMv8.0 Marc Zyngier
2021-01-15 14:01   ` Auger Eric
2021-01-14 10:56 ` [PATCH 6/6] KVM: arm64: Upgrade PMU support to ARMv8.4 Marc Zyngier
2021-01-15 14:01   ` Auger Eric
2021-01-15 16:42     ` Marc Zyngier
2021-01-15 17:26       ` Auger Eric

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