From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Shuah Khan <skhan@linuxfoundation.org>,
Shuah Khan <shuah@kernel.org>
Cc: 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,
Mark Brown <broonie@kernel.org>
Subject: [PATCH v9 18/40] arm64/sme: Disable ZA and streaming mode when handling signals
Date: Wed, 26 Jan 2022 15:10:58 +0000 [thread overview]
Message-ID: <20220126151120.3811248-19-broonie@kernel.org> (raw)
In-Reply-To: <20220126151120.3811248-1-broonie@kernel.org>
The ABI requires that streaming mode and ZA are disabled when invoking
signal handlers, do this in setup_return() when we prepare the task state
for the signal handler.
Signed-off-by: Mark Brown <broonie@kernel.org>
---
arch/arm64/kernel/signal.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index d8aaf4b6f432..cda04fd73333 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -758,6 +758,13 @@ static void setup_return(struct pt_regs *regs, struct k_sigaction *ka,
/* TCO (Tag Check Override) always cleared for signal handlers */
regs->pstate &= ~PSR_TCO_BIT;
+ /* Signal handlers are invoked with ZA and streaming mode disabled */
+ if (system_supports_sme()) {
+ current->thread.svcr &= ~(SYS_SVCR_EL0_ZA_MASK |
+ SYS_SVCR_EL0_SM_MASK);
+ sme_smstop();
+ }
+
if (ka->sa.sa_flags & SA_RESTORER)
sigtramp = ka->sa.sa_restorer;
else
--
2.30.2
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next prev parent reply other threads:[~2022-01-26 15:43 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-26 15:10 [PATCH v9 00/40] arm64/sme: Initial support for the Scalable Matrix Extension Mark Brown
2022-01-26 15:10 ` [PATCH v9 01/40] arm64: Define CPACR_EL1_FPEN similarly to other floating point controls Mark Brown
2022-01-26 15:10 ` [PATCH v9 02/40] arm64: Always use individual bits in CPACR floating point enables Mark Brown
2022-01-26 15:10 ` [PATCH v9 03/40] arm64: cpufeature: Always specify and use a field width for capabilities Mark Brown
2022-01-26 15:10 ` [PATCH v9 04/40] kselftest/arm64: Remove local ARRAY_SIZE() definitions Mark Brown
2022-01-26 15:10 ` [PATCH v9 05/40] arm64/sme: Provide ABI documentation for SME Mark Brown
2022-01-26 15:10 ` [PATCH v9 06/40] arm64/sme: System register and exception syndrome definitions Mark Brown
2022-01-26 15:10 ` [PATCH v9 07/40] arm64/sme: Manually encode SME instructions Mark Brown
2022-01-26 15:10 ` [PATCH v9 08/40] arm64/sme: Early CPU setup for SME Mark Brown
2022-01-26 15:10 ` [PATCH v9 09/40] arm64/sme: Basic enumeration support Mark Brown
2022-01-26 15:10 ` [PATCH v9 10/40] arm64/sme: Identify supported SME vector lengths at boot Mark Brown
2022-01-26 15:10 ` [PATCH v9 11/40] arm64/sme: Implement sysctl to set the default vector length Mark Brown
2022-01-26 15:10 ` [PATCH v9 12/40] arm64/sme: Implement vector length configuration prctl()s Mark Brown
2022-01-26 15:10 ` [PATCH v9 13/40] arm64/sme: Implement support for TPIDR2 Mark Brown
2022-01-26 15:10 ` [PATCH v9 14/40] arm64/sme: Implement SVCR context switching Mark Brown
2022-01-26 15:10 ` [PATCH v9 15/40] arm64/sme: Implement streaming SVE " Mark Brown
2022-01-26 15:10 ` [PATCH v9 16/40] arm64/sme: Implement ZA " Mark Brown
2022-01-26 15:10 ` [PATCH v9 17/40] arm64/sme: Implement traps and syscall handling for SME Mark Brown
2022-01-26 15:10 ` Mark Brown [this message]
2022-01-26 15:10 ` [PATCH v9 19/40] arm64/sme: Implement streaming SVE signal handling Mark Brown
2022-01-26 15:11 ` [PATCH v9 20/40] arm64/sme: Implement ZA " Mark Brown
2022-01-26 15:11 ` [PATCH v9 21/40] arm64/sme: Implement ptrace support for streaming mode SVE registers Mark Brown
2022-01-26 15:11 ` [PATCH v9 22/40] arm64/sme: Add ptrace support for ZA Mark Brown
2022-01-26 15:11 ` [PATCH v9 23/40] arm64/sme: Disable streaming mode and ZA when flushing CPU state Mark Brown
2022-01-26 15:11 ` [PATCH v9 24/40] arm64/sme: Save and restore streaming mode over EFI runtime calls Mark Brown
2022-01-26 15:11 ` [PATCH v9 25/40] KVM: arm64: Hide SME system registers from guests Mark Brown
2022-01-26 15:11 ` [PATCH v9 26/40] KVM: arm64: Trap SME usage in guest Mark Brown
2022-01-26 15:11 ` [PATCH v9 27/40] KVM: arm64: Handle SME host state when running guests Mark Brown
2022-01-26 15:11 ` [PATCH v9 28/40] arm64/sme: Provide Kconfig for SME Mark Brown
2022-01-26 15:11 ` [PATCH v9 29/40] kselftest/arm64: sme: Add streaming SME support to vlset Mark Brown
2022-01-26 15:11 ` [PATCH v9 30/40] kselftest/arm64: Add tests for TPIDR2 Mark Brown
2022-01-26 15:11 ` [PATCH v9 31/40] kselftest/arm64: Extend vector configuration API tests to cover SME Mark Brown
2022-01-26 15:11 ` [PATCH v9 32/40] kselftest/arm64: sme: Provide streaming mode SVE stress test Mark Brown
2022-01-26 15:11 ` [PATCH v9 33/40] kselftest/arm64: signal: Allow tests to be incompatible with features Mark Brown
2022-01-26 15:11 ` [PATCH v9 34/40] kselftest/arm64: signal: Handle ZA signal context in core code Mark Brown
2022-01-26 15:11 ` [PATCH v9 35/40] kselftest/arm64: Add stress test for SME ZA context switching Mark Brown
2022-01-26 15:11 ` [PATCH v9 36/40] kselftest/arm64: signal: Add SME signal handling tests Mark Brown
2022-01-26 15:11 ` [PATCH v9 37/40] kselftest/arm64: Add streaming SVE to SVE ptrace tests Mark Brown
2022-01-26 15:11 ` [PATCH v9 38/40] kselftest/arm64: Add coverage for the ZA ptrace interface Mark Brown
2022-01-26 15:11 ` [PATCH v9 39/40] kselftest/arm64: Add SME support to syscall ABI test Mark Brown
2022-01-26 15:11 ` [PATCH v9 40/40] squqsh traps Mark Brown
2022-01-26 15:24 ` Mark Brown
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