From: Catalin Marinas <catalin.marinas@arm.com>
To: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Shuah Khan <skhan@linuxfoundation.org>,
Shuah Khan <shuah@kernel.org>,
Alan Hayward <alan.hayward@arm.com>,
Luis Machado <luis.machado@arm.com>,
Salil Akerkar <Salil.Akerkar@arm.com>,
Basant Kumar Dwivedi <Basant.KumarDwivedi@arm.com>,
Szabolcs Nagy <szabolcs.nagy@arm.com>,
James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-kselftest@vger.kernel.org, kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH v11 16/40] arm64/sme: Implement streaming SVE context switching
Date: Tue, 22 Feb 2022 12:53:11 +0000 [thread overview]
Message-ID: <YhTct2Cy1fMOsjuZ@arm.com> (raw)
In-Reply-To: <20220207152109.197566-17-broonie@kernel.org>
On Mon, Feb 07, 2022 at 03:20:45PM +0000, Mark Brown wrote:
> When in streaming mode we need to save and restore the streaming mode
> SVE register state rather than the regular SVE register state. This uses
> the streaming mode vector length and omits FFR but is otherwise identical,
> if TIF_SVE is enabled when we are in streaming mode then streaming mode
> takes precedence.
>
> This does not handle use of streaming SVE state with KVM, ptrace or
> signals. This will be updated in further patches.
I think I get this but a state diagram somewhere would help ;).
IIUC you don't disable SM on a context switch, you just leave it in
place until a task_fpsimd_load(). It shouldn't be a problem as
kernel_neon_begin() disables it anyway.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
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next prev parent reply other threads:[~2022-02-22 12:54 UTC|newest]
Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-07 15:20 [PATCH v11 00/40] arm64/sme: Initial support for the Scalable Matrix Extension Mark Brown
2022-02-07 15:20 ` [PATCH v11 01/40] arm64: Define CPACR_EL1_FPEN similarly to other floating point controls Mark Brown
2022-02-10 11:34 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 02/40] arm64: Always use individual bits in CPACR floating point enables Mark Brown
2022-02-10 11:36 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 03/40] arm64: cpufeature: Always specify and use a field width for capabilities Mark Brown
2022-02-10 11:39 ` Catalin Marinas
2022-02-10 11:55 ` Suzuki K Poulose
2022-03-01 22:56 ` Qian Cai
2022-03-02 10:12 ` Marc Zyngier
2022-03-02 11:52 ` Catalin Marinas
2022-03-02 13:02 ` Mark Brown
2022-03-02 12:58 ` Mark Brown
2022-02-07 15:20 ` [PATCH v11 04/40] kselftest/arm64: Remove local ARRAY_SIZE() definitions Mark Brown
2022-02-07 23:45 ` Shuah Khan
2022-02-10 15:03 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 05/40] kselftest/arm64: signal: Allow tests to be incompatible with features Mark Brown
2022-02-07 23:54 ` Shuah Khan
2022-02-08 15:32 ` Mark Brown
2022-02-10 15:08 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 06/40] arm64/sme: Provide ABI documentation for SME Mark Brown
2022-02-08 0:10 ` Shuah Khan
2022-02-08 15:46 ` Mark Brown
2022-02-08 18:38 ` Mark Brown
2022-02-08 18:48 ` Shuah Khan
2022-02-08 19:00 ` Mark Brown
2022-02-10 15:12 ` Shuah Khan
2022-02-10 16:18 ` Mark Brown
2022-02-10 16:46 ` Shuah Khan
2022-02-10 18:32 ` Catalin Marinas
2022-02-10 19:45 ` Mark Brown
2022-02-11 17:02 ` Catalin Marinas
2022-02-11 18:13 ` Mark Brown
2022-02-14 18:19 ` Catalin Marinas
2022-02-14 19:40 ` Mark Brown
2022-02-07 15:20 ` [PATCH v11 07/40] arm64/sme: System register and exception syndrome definitions Mark Brown
2022-02-10 18:35 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 08/40] arm64/sme: Manually encode SME instructions Mark Brown
2022-02-10 18:57 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 09/40] arm64/sme: Early CPU setup for SME Mark Brown
2022-02-21 11:54 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 10/40] arm64/sme: Basic enumeration support Mark Brown
2022-02-21 14:32 ` Catalin Marinas
2022-02-21 15:01 ` Mark Brown
2022-02-21 19:24 ` Catalin Marinas
2022-02-21 23:10 ` Mark Brown
2022-02-22 12:09 ` Catalin Marinas
2022-02-21 16:07 ` Szabolcs Nagy
2022-02-21 19:04 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 11/40] arm64/sme: Identify supported SME vector lengths at boot Mark Brown
2022-02-21 15:57 ` Catalin Marinas
2022-02-21 23:39 ` Mark Brown
2022-02-07 15:20 ` [PATCH v11 12/40] arm64/sme: Implement sysctl to set the default vector length Mark Brown
2022-02-21 16:48 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 13/40] arm64/sme: Implement vector length configuration prctl()s Mark Brown
2022-02-21 16:48 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 14/40] arm64/sme: Implement support for TPIDR2 Mark Brown
2022-02-21 16:58 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 15/40] arm64/sme: Implement SVCR context switching Mark Brown
2022-02-21 18:12 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 16/40] arm64/sme: Implement streaming SVE " Mark Brown
2022-02-22 12:53 ` Catalin Marinas [this message]
2022-02-22 13:42 ` Mark Brown
2022-02-07 15:20 ` [PATCH v11 17/40] arm64/sme: Implement ZA " Mark Brown
2022-02-22 12:53 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 18/40] arm64/sme: Implement traps and syscall handling for SME Mark Brown
2022-02-22 17:54 ` Catalin Marinas
2022-02-22 18:16 ` Mark Brown
2022-02-07 15:20 ` [PATCH v11 19/40] arm64/sme: Disable ZA and streaming mode when handling signals Mark Brown
2022-02-22 18:48 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 20/40] arm64/sme: Implement streaming SVE signal handling Mark Brown
2022-02-23 15:16 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 21/40] arm64/sme: Implement ZA " Mark Brown
2022-02-23 15:19 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 22/40] arm64/sme: Implement ptrace support for streaming mode SVE registers Mark Brown
2022-02-23 15:22 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 23/40] arm64/sme: Add ptrace support for ZA Mark Brown
2022-02-23 15:27 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 24/40] arm64/sme: Disable streaming mode and ZA when flushing CPU state Mark Brown
2022-02-23 15:28 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 25/40] arm64/sme: Save and restore streaming mode over EFI runtime calls Mark Brown
2022-02-23 15:31 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 26/40] KVM: arm64: Hide SME system registers from guests Mark Brown
2022-02-23 15:32 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 27/40] KVM: arm64: Trap SME usage in guest Mark Brown
2022-02-23 15:34 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 28/40] KVM: arm64: Handle SME host state when running guests Mark Brown
2022-02-23 15:40 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 29/40] arm64/sme: Provide Kconfig for SME Mark Brown
2022-02-23 15:41 ` Catalin Marinas
2022-02-07 15:20 ` [PATCH v11 30/40] kselftest/arm64: Add manual encodings for SME instructions Mark Brown
2022-02-07 23:57 ` Shuah Khan
2022-02-23 15:41 ` Catalin Marinas
2022-02-07 15:21 ` [PATCH v11 31/40] kselftest/arm64: sme: Add SME support to vlset Mark Brown
2022-02-08 0:15 ` Shuah Khan
2022-02-08 15:51 ` Mark Brown
2022-02-23 15:42 ` Catalin Marinas
2022-02-07 15:21 ` [PATCH v11 32/40] kselftest/arm64: Add tests for TPIDR2 Mark Brown
2022-02-08 0:23 ` Shuah Khan
2022-02-08 16:19 ` Mark Brown
2022-02-23 15:42 ` Catalin Marinas
2022-02-07 15:21 ` [PATCH v11 33/40] kselftest/arm64: Extend vector configuration API tests to cover SME Mark Brown
2022-02-08 0:24 ` Shuah Khan
2022-02-23 15:43 ` Catalin Marinas
2022-02-07 15:21 ` [PATCH v11 34/40] kselftest/arm64: sme: Provide streaming mode SVE stress test Mark Brown
2022-02-08 0:40 ` Shuah Khan
2022-02-08 16:23 ` Mark Brown
2022-02-23 15:45 ` Catalin Marinas
2022-02-07 15:21 ` [PATCH v11 35/40] kselftest/arm64: signal: Handle ZA signal context in core code Mark Brown
2022-02-08 1:01 ` Shuah Khan
2022-02-08 16:29 ` Mark Brown
2022-02-23 15:46 ` Catalin Marinas
2022-02-07 15:21 ` [PATCH v11 36/40] kselftest/arm64: Add stress test for SME ZA context switching Mark Brown
2022-02-23 15:47 ` Catalin Marinas
2022-02-07 15:21 ` [PATCH v11 37/40] kselftest/arm64: signal: Add SME signal handling tests Mark Brown
2022-02-08 1:08 ` Shuah Khan
2022-02-08 17:27 ` Mark Brown
2022-02-23 15:47 ` Catalin Marinas
2022-02-07 15:21 ` [PATCH v11 38/40] kselftest/arm64: Add streaming SVE to SVE ptrace tests Mark Brown
2022-02-08 1:13 ` Shuah Khan
2022-02-23 15:47 ` Catalin Marinas
2022-02-07 15:21 ` [PATCH v11 39/40] kselftest/arm64: Add coverage for the ZA ptrace interface Mark Brown
2022-02-08 1:20 ` Shuah Khan
2022-02-23 15:47 ` Catalin Marinas
2022-02-07 15:21 ` [PATCH v11 40/40] kselftest/arm64: Add SME support to syscall ABI test Mark Brown
2022-02-08 1:52 ` Shuah Khan
2022-02-08 18:15 ` Mark Brown
2022-02-08 18:50 ` Shuah Khan
2022-02-23 15:49 ` Catalin Marinas
2022-02-08 18:54 ` [PATCH v11 00/40] arm64/sme: Initial support for the Scalable Matrix Extension Shuah Khan
2022-02-25 15:50 ` Will Deacon
2022-02-25 15:52 ` Will Deacon
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