From: Marc Zyngier <maz@kernel.org>
To: Colton Lewis <coltonlewis@google.com>
Cc: kvmarm@lists.linux.dev, kvm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, james.morse@arm.com,
suzuki.poulose@arm.com, oliver.upton@linux.dev,
yuzenghui@huawei.com, ricarkol@google.com, sveith@amazon.de,
dwmw2@infradead.org
Subject: Re: [PATCH 15/16] KVM: arm64: selftests: Augment existing timer test to handle variable offsets
Date: Tue, 14 Mar 2023 18:18:50 +0000 [thread overview]
Message-ID: <86edprxkl1.wl-maz@kernel.org> (raw)
In-Reply-To: <gsnta60fcjje.fsf@coltonlewis-kvm.c.googlers.com>
On Tue, 14 Mar 2023 17:47:01 +0000,
Colton Lewis <coltonlewis@google.com> wrote:
>
> I'll be looking at it and will keep in mind your questions about my
> hardware should I find any issues. Yes it has ECV and CNTPOFF but no I
> didn't try turning it off for this because my issue occured only when
> setting a physical offset and that can't be done without ECV.
And yet this is exactly what these patches do: allow setting a
physical offset without ECV+CNTPOFF.
CNTPOFF is only a performance optimisation. It could be that my
handling of CNTPOFF is buggy, or that your HW is less than stellar, or
both. Testing the various combinations would certainly help.
M.
--
Without deviation from the norm, progress is not possible.
WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: Colton Lewis <coltonlewis@google.com>
Cc: kvmarm@lists.linux.dev, kvm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, james.morse@arm.com,
suzuki.poulose@arm.com, oliver.upton@linux.dev,
yuzenghui@huawei.com, ricarkol@google.com, sveith@amazon.de,
dwmw2@infradead.org
Subject: Re: [PATCH 15/16] KVM: arm64: selftests: Augment existing timer test to handle variable offsets
Date: Tue, 14 Mar 2023 18:18:50 +0000 [thread overview]
Message-ID: <86edprxkl1.wl-maz@kernel.org> (raw)
In-Reply-To: <gsnta60fcjje.fsf@coltonlewis-kvm.c.googlers.com>
On Tue, 14 Mar 2023 17:47:01 +0000,
Colton Lewis <coltonlewis@google.com> wrote:
>
> I'll be looking at it and will keep in mind your questions about my
> hardware should I find any issues. Yes it has ECV and CNTPOFF but no I
> didn't try turning it off for this because my issue occured only when
> setting a physical offset and that can't be done without ECV.
And yet this is exactly what these patches do: allow setting a
physical offset without ECV+CNTPOFF.
CNTPOFF is only a performance optimisation. It could be that my
handling of CNTPOFF is buggy, or that your HW is less than stellar, or
both. Testing the various combinations would certainly help.
M.
--
Without deviation from the norm, progress is not possible.
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linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-03-14 18:18 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-16 14:21 [PATCH 00/16] KVM: arm64: Rework timer offsetting for fun and profit Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 01/16] arm64: Add CNTPOFF_EL2 register definition Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 02/16] arm64: Add HAS_ECV_CNTPOFF capability Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-22 4:30 ` Reiji Watanabe
2023-02-22 4:30 ` Reiji Watanabe
2023-02-22 10:47 ` Marc Zyngier
2023-02-22 10:47 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 03/16] kvm: arm64: Expose {un,}lock_all_vcpus() to the reset of KVM Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-23 22:30 ` Colton Lewis
2023-02-23 22:30 ` Colton Lewis
2023-02-16 14:21 ` [PATCH 04/16] KVM: arm64: timers: Use a per-vcpu, per-timer accumulator for fractional ns Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-23 22:30 ` Colton Lewis
2023-02-23 22:30 ` Colton Lewis
2023-02-16 14:21 ` [PATCH 05/16] KVM: arm64: timers: Convert per-vcpu virtual offset to a global value Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-22 6:15 ` Reiji Watanabe
2023-02-22 6:15 ` Reiji Watanabe
2023-02-22 10:54 ` Marc Zyngier
2023-02-22 10:54 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 06/16] KVM: arm64: timers: Use CNTPOFF_EL2 to offset the physical timer Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-23 22:34 ` Colton Lewis
2023-02-23 22:34 ` Colton Lewis
2023-02-24 8:59 ` Marc Zyngier
2023-02-24 8:59 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 07/16] KVM: arm64: timers: Allow physical offset without CNTPOFF_EL2 Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-23 22:40 ` Colton Lewis
2023-02-23 22:40 ` Colton Lewis
2023-02-24 10:54 ` Marc Zyngier
2023-02-24 10:54 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 08/16] KVM: arm64: timers: Allow userspace to set the counter offsets Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-16 22:09 ` Oliver Upton
2023-02-16 22:09 ` Oliver Upton
2023-02-17 10:17 ` Marc Zyngier
2023-02-17 10:17 ` Marc Zyngier
2023-02-17 22:11 ` Oliver Upton
2023-02-17 22:11 ` Oliver Upton
2023-02-22 11:56 ` Marc Zyngier
2023-02-22 11:56 ` Marc Zyngier
2023-02-22 16:34 ` Oliver Upton
2023-02-22 16:34 ` Oliver Upton
2023-02-23 18:25 ` Marc Zyngier
2023-02-23 18:25 ` Marc Zyngier
2023-03-08 7:46 ` Oliver Upton
2023-03-08 7:46 ` Oliver Upton
2023-03-08 7:53 ` Oliver Upton
2023-03-08 7:53 ` Oliver Upton
2023-03-09 8:29 ` Marc Zyngier
2023-03-09 8:29 ` Marc Zyngier
2023-03-09 8:25 ` Marc Zyngier
2023-03-09 8:25 ` Marc Zyngier
2023-02-23 22:41 ` Colton Lewis
2023-02-23 22:41 ` Colton Lewis
2023-02-24 11:24 ` Marc Zyngier
2023-02-24 11:24 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 09/16] KVM: arm64: timers: Allow save/restoring of the physical timer Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 10/16] KVM: arm64: timers: Rationalise per-vcpu timer init Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 11/16] KVM: arm64: Document KVM_ARM_SET_CNT_OFFSETS and co Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 12/16] KVM: arm64: nv: timers: Add a per-timer, per-vcpu offset Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-24 20:07 ` Colton Lewis
2023-02-24 20:07 ` Colton Lewis
2023-02-25 10:32 ` Marc Zyngier
2023-02-25 10:32 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 13/16] KVM: arm64: nv: timers: Support hyp timer emulation Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-24 20:08 ` Colton Lewis
2023-02-24 20:08 ` Colton Lewis
2023-02-25 10:34 ` Marc Zyngier
2023-02-25 10:34 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 14/16] KVM: arm64: selftests: Add physical timer registers to the sysreg list Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 15/16] KVM: arm64: selftests: Augment existing timer test to handle variable offsets Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-03-06 22:08 ` Colton Lewis
2023-03-06 22:08 ` Colton Lewis
2023-03-09 9:01 ` Marc Zyngier
2023-03-09 9:01 ` Marc Zyngier
2023-03-10 19:26 ` Colton Lewis
2023-03-10 19:26 ` Colton Lewis
2023-03-12 15:53 ` Marc Zyngier
2023-03-12 15:53 ` Marc Zyngier
2023-03-13 11:43 ` Marc Zyngier
2023-03-13 11:43 ` Marc Zyngier
2023-03-14 17:47 ` Colton Lewis
2023-03-14 17:47 ` Colton Lewis
2023-03-14 18:18 ` Marc Zyngier [this message]
2023-03-14 18:18 ` Marc Zyngier
2023-02-16 14:21 ` [PATCH 16/16] KVM: arm64: selftests: Deal with spurious timer interrupts Marc Zyngier
2023-02-16 14:21 ` Marc Zyngier
2023-02-21 16:28 ` [PATCH 00/16] KVM: arm64: Rework timer offsetting for fun and profit Veith, Simon
2023-02-21 16:28 ` Veith, Simon
2023-02-21 22:17 ` Marc Zyngier
2023-02-21 22:17 ` Marc Zyngier
2023-02-23 22:29 ` Colton Lewis
2023-02-23 22:29 ` Colton Lewis
2023-02-24 8:45 ` Marc Zyngier
2023-02-24 8:45 ` Marc Zyngier
2023-02-24 20:07 ` Colton Lewis
2023-02-24 20:07 ` Colton Lewis
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