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From: Alexandru Elisei <alexandru.elisei@arm.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>,
	Eric Auger <eric.auger@redhat.com>,
	kernel-team@android.com
Subject: Re: [PATCH v2 5/7] KVM: arm64: Limit the debug architecture to ARMv8.0
Date: Wed, 27 Jan 2021 12:18:29 +0000	[thread overview]
Message-ID: <c21135dc-a579-fab2-dbd5-0e6221ed79a3@arm.com> (raw)
In-Reply-To: <20210125122638.2947058-6-maz@kernel.org>

Hi Marc,

This looks correct, and it also matches what we report for aarch32 in trap_dbgidr():

Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>

On 1/25/21 12:26 PM, Marc Zyngier wrote:
> Let's not pretend we support anything but ARMv8.0 as far as the
> debug architecture is concerned.
>
> Reviewed-by: Eric Auger <eric.auger@redhat.com>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> ---
>  arch/arm64/kvm/sys_regs.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index dda16d60197b..8f79ec1fffa7 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -1048,6 +1048,9 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
>  				 FEATURE(ID_AA64ISAR1_GPI));
>  		break;
>  	case SYS_ID_AA64DFR0_EL1:
> +		/* Limit debug to ARMv8.0 */
> +		val &= ~FEATURE(ID_AA64DFR0_DEBUGVER);
> +		val |= FIELD_PREP(FEATURE(ID_AA64DFR0_DEBUGVER), 6);
>  		/* Limit guests to PMUv3 for ARMv8.1 */
>  		val = cpuid_feature_cap_perfmon_field(val,
>  						      ID_AA64DFR0_PMUVER_SHIFT,

  reply	other threads:[~2021-01-27 12:22 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25 12:26 [PATCH v2 0/7] KVM: arm64: More PMU/debug ID register fixes Marc Zyngier
2021-01-25 12:26 ` [PATCH v2 1/7] KVM: arm64: Fix missing RES1 in emulation of DBGBIDR Marc Zyngier
2021-01-26 17:32   ` Alexandru Elisei
2021-01-25 12:26 ` [PATCH v2 2/7] KVM: arm64: Fix AArch32 PMUv3 capping Marc Zyngier
2021-01-26 17:35   ` Alexandru Elisei
2021-01-25 12:26 ` [PATCH v2 3/7] KVM: arm64: Add handling of AArch32 PCMEID{2,3} PMUv3 registers Marc Zyngier
2021-01-25 12:26 ` [PATCH v2 4/7] KVM: arm64: Refactor filtering of ID registers Marc Zyngier
2021-01-27 12:12   ` Alexandru Elisei
2021-01-25 12:26 ` [PATCH v2 5/7] KVM: arm64: Limit the debug architecture to ARMv8.0 Marc Zyngier
2021-01-27 12:18   ` Alexandru Elisei [this message]
2021-01-25 12:26 ` [PATCH v2 6/7] KVM: arm64: Upgrade PMU support to ARMv8.4 Marc Zyngier
2021-01-27 14:09   ` Alexandru Elisei
2021-01-27 14:35     ` Marc Zyngier
2021-01-27 17:00       ` Alexandru Elisei
2021-01-27 17:23         ` Marc Zyngier
2021-01-27 17:41   ` Alexandru Elisei
2021-02-03 10:32     ` Marc Zyngier
2021-02-03 17:29       ` Alexandru Elisei
2021-01-27 17:53   ` Auger Eric
2021-02-03 10:36     ` Marc Zyngier
2021-02-03 11:07       ` Auger Eric
2021-02-03 11:20         ` Marc Zyngier
2021-02-03 12:39           ` Auger Eric
2021-02-03 13:28             ` Marc Zyngier
2021-02-04 12:32               ` Alexandru Elisei
2021-02-04 14:21                 ` Marc Zyngier
2021-01-25 12:26 ` [PATCH v2 7/7] KVM: arm64: Use symbolic names for the PMU versions Marc Zyngier
2021-01-27 14:28   ` Alexandru Elisei
2021-01-27 17:56   ` Auger Eric

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