From: Mark Brown <broonie@kernel.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>, Joey Gouly <joey.gouly@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Will Deacon <will@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Jonathan Corbet <corbet@lwn.net>, Shuah Khan <shuah@kernel.org>,
Oliver Upton <oupton@kernel.org>,
Dave Martin <Dave.Martin@arm.com>, Fuad Tabba <tabba@google.com>,
Ben Horgan <ben.horgan@arm.com>,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org,
Peter Maydell <peter.maydell@linaro.org>,
Eric Auger <eric.auger@redhat.com>
Subject: Re: [PATCH v10 04/30] arm64/fpsimd: Determine maximum virtualisable SME vector length
Date: Mon, 11 May 2026 21:42:36 +0900 [thread overview]
Message-ID: <agHOvFiI1e3y_ur4@sirena.co.uk> (raw)
In-Reply-To: <agGwWE2hcj9O4EGu@J2N7QTR9R3.cambridge.arm.com>
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On Mon, May 11, 2026 at 11:32:56AM +0100, Mark Rutland wrote:
> On Fri, Mar 06, 2026 at 05:00:56PM +0000, Mark Brown wrote:
> > +#define SME_VQ_INVALID (SME_VQ_MAX + 1)
> Does using (SME_VQ_MAX + 1) for this make something easier than if we
> used 0?
There were checks for VLs less than $THING which were causing annoyance
IIRC but it should be workable since we shouldn't offer SME to guests if
the invalid VL comes up. I'll look again when I'm back from holiday.
> To solve all of the above, I think what we actually want to do is find
> the largest uniformly implemented VL which is smaller than the smallest
> partially implemented VL.
Yes, that's what we're going for.
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next prev parent reply other threads:[~2026-05-11 12:42 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-06 17:00 [PATCH v10 00/30] KVM: arm64: Implement support for SME Mark Brown
2026-03-06 17:00 ` [PATCH v10 01/30] arm64/sysreg: Update SMIDR_EL1 to DDI0601 2025-06 Mark Brown
2026-03-16 16:34 ` Catalin Marinas
2026-05-08 17:12 ` Mark Rutland
2026-05-09 0:43 ` Mark Brown
2026-05-11 10:40 ` Mark Rutland
2026-05-11 12:31 ` Mark Brown
2026-03-06 17:00 ` [PATCH v10 02/30] arm64/fpsimd: Update FA64 and ZT0 enables when loading SME state Mark Brown
2026-03-16 17:37 ` Catalin Marinas
2026-03-06 17:00 ` [PATCH v10 03/30] arm64/fpsimd: Decide to save ZT0 and streaming mode FFR at bind time Mark Brown
2026-03-16 17:42 ` Catalin Marinas
2026-03-06 17:00 ` [PATCH v10 04/30] arm64/fpsimd: Determine maximum virtualisable SME vector length Mark Brown
2026-03-16 17:44 ` Catalin Marinas
2026-03-18 17:29 ` Jean-Philippe Brucker
2026-05-11 10:32 ` Mark Rutland
2026-05-11 12:42 ` Mark Brown [this message]
2026-03-06 17:00 ` [PATCH v10 05/30] KVM: arm64: Pay attention to FFR parameter in SVE save and load Mark Brown
2026-03-18 17:30 ` Jean-Philippe Brucker
2026-03-06 17:00 ` [PATCH v10 06/30] KVM: arm64: Pull ctxt_has_ helpers to start of sysreg-sr.h Mark Brown
2026-03-18 17:31 ` Jean-Philippe Brucker
2026-03-06 17:00 ` [PATCH v10 07/30] KVM: arm64: Move SVE state access macros after feature test macros Mark Brown
2026-03-18 17:32 ` Jean-Philippe Brucker
2026-03-06 17:01 ` [PATCH v10 08/30] KVM: arm64: Rename SVE finalization constants to be more general Mark Brown
2026-03-18 17:33 ` Jean-Philippe Brucker
2026-03-06 17:01 ` [PATCH v10 09/30] KVM: arm64: Define internal features for SME Mark Brown
2026-03-18 17:44 ` Jean-Philippe Brucker
2026-03-18 17:50 ` Mark Brown
2026-03-06 17:01 ` [PATCH v10 10/30] KVM: arm64: Rename sve_state_reg_region Mark Brown
2026-03-18 17:46 ` Jean-Philippe Brucker
2026-03-06 17:01 ` [PATCH v10 11/30] KVM: arm64: Store vector lengths in an array Mark Brown
2026-03-18 17:48 ` Jean-Philippe Brucker
2026-03-06 17:01 ` [PATCH v10 12/30] KVM: arm64: Factor SVE code out of fpsimd_lazy_switch_to_host() Mark Brown
2026-03-18 17:49 ` Jean-Philippe Brucker
2026-03-06 17:01 ` [PATCH v10 13/30] KVM: arm64: Document the KVM ABI for SME Mark Brown
2026-03-18 17:51 ` Jean-Philippe Brucker
2026-03-06 17:01 ` [PATCH v10 14/30] KVM: arm64: Implement SME vector length configuration Mark Brown
2026-03-18 17:53 ` Jean-Philippe Brucker
2026-04-23 18:34 ` Mark Brown
2026-03-06 17:01 ` [PATCH v10 15/30] KVM: arm64: Support SME control registers Mark Brown
2026-03-18 17:54 ` Jean-Philippe Brucker
2026-05-08 17:20 ` Mark Rutland
2026-05-11 14:17 ` Mark Brown
2026-03-06 17:01 ` [PATCH v10 16/30] KVM: arm64: Support TPIDR2_EL0 Mark Brown
2026-03-18 17:55 ` Jean-Philippe Brucker
2026-03-06 17:01 ` [PATCH v10 17/30] KVM: arm64: Support SME identification registers for guests Mark Brown
2026-03-18 17:27 ` Jean-Philippe Brucker
2026-03-06 17:01 ` [PATCH v10 18/30] KVM: arm64: Support SME priority registers Mark Brown
2026-03-06 17:01 ` [PATCH v10 19/30] KVM: arm64: Provide assembly for SME register access Mark Brown
2026-03-06 17:01 ` [PATCH v10 20/30] KVM: arm64: Support userspace access to streaming mode Z and P registers Mark Brown
2026-03-06 17:01 ` [PATCH v10 21/30] KVM: arm64: Flush register state on writes to SVCR.SM and SVCR.ZA Mark Brown
2026-03-06 17:01 ` [PATCH v10 22/30] KVM: arm64: Expose SME specific state to userspace Mark Brown
2026-03-06 17:01 ` [PATCH v10 23/30] KVM: arm64: Context switch SME state for guests Mark Brown
2026-03-06 17:01 ` [PATCH v10 24/30] KVM: arm64: Handle SME exceptions Mark Brown
2026-03-06 17:01 ` [PATCH v10 25/30] KVM: arm64: Expose SME to nested guests Mark Brown
2026-03-06 17:01 ` [PATCH v10 26/30] KVM: arm64: Provide interface for configuring and enabling SME for guests Mark Brown
2026-03-06 17:01 ` [PATCH v10 27/30] KVM: arm64: selftests: Remove spurious check for single bit safe values Mark Brown
2026-03-06 17:01 ` [PATCH v10 28/30] KVM: arm64: selftests: Skip impossible invalid value tests Mark Brown
2026-03-24 14:54 ` Ben Horgan
2026-03-24 14:56 ` Mark Brown
2026-03-06 17:01 ` [PATCH v10 29/30] KVM: arm64: selftests: Add SME system registers to get-reg-list Mark Brown
2026-03-06 17:01 ` [PATCH v10 30/30] KVM: arm64: selftests: Add SME to set_id_regs test Mark Brown
2026-04-02 21:12 ` (subset) [PATCH v10 00/30] KVM: arm64: Implement support for SME Catalin Marinas
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