From: Catalin Marinas <catalin.marinas@arm.com>
To: Dave Martin <Dave.Martin@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org,
"Okamoto Takayuki" <tokamoto@jp.fujitsu.com>,
libc-alpha@sourceware.org,
"Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
"Szabolcs Nagy" <szabolcs.nagy@arm.com>,
"Will Deacon" <will.deacon@arm.com>,
"Marc Zyngier" <marc.zyngier@arm.com>,
"Richard Sandiford" <richard.sandiford@arm.com>,
"Alex Bennée" <alex.bennee@linaro.org>,
kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH v3 22/28] arm64/sve: KVM: Prevent guests from using SVE
Date: Thu, 12 Oct 2017 18:13:01 +0100 [thread overview]
Message-ID: <20171012171301.whfdkfkzvkvxtgz7@armageddon.cambridge.arm.com> (raw)
In-Reply-To: <1507660725-7986-23-git-send-email-Dave.Martin@arm.com>
On Tue, Oct 10, 2017 at 07:38:39PM +0100, Dave P Martin wrote:
> Until KVM has full SVE support, guests must not be allowed to
> execute SVE instructions.
>
> This patch enables the necessary traps, and also ensures that the
> traps are disabled again on exit from the guest so that the host
> can still use SVE if it wants to.
>
> This patch introduces another instance of
> __this_cpu_write(fpsimd_last_state, NULL), so this flush operation
> is abstracted out as a separate helper fpsimd_flush_cpu_state().
> Other instances are ported appropriately.
>
> As a side effect of this refactoring, a this_cpu_write() in
> fpsimd_cpu_pm_notifier() is changed to __this_cpu_write(). This
> should be fine, since cpu_pm_enter() is supposed to be called only
> with interrupts disabled.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
WARNING: multiple messages have this Message-ID (diff)
From: catalin.marinas@arm.com (Catalin Marinas)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 22/28] arm64/sve: KVM: Prevent guests from using SVE
Date: Thu, 12 Oct 2017 18:13:01 +0100 [thread overview]
Message-ID: <20171012171301.whfdkfkzvkvxtgz7@armageddon.cambridge.arm.com> (raw)
In-Reply-To: <1507660725-7986-23-git-send-email-Dave.Martin@arm.com>
On Tue, Oct 10, 2017 at 07:38:39PM +0100, Dave P Martin wrote:
> Until KVM has full SVE support, guests must not be allowed to
> execute SVE instructions.
>
> This patch enables the necessary traps, and also ensures that the
> traps are disabled again on exit from the guest so that the host
> can still use SVE if it wants to.
>
> This patch introduces another instance of
> __this_cpu_write(fpsimd_last_state, NULL), so this flush operation
> is abstracted out as a separate helper fpsimd_flush_cpu_state().
> Other instances are ported appropriately.
>
> As a side effect of this refactoring, a this_cpu_write() in
> fpsimd_cpu_pm_notifier() is changed to __this_cpu_write(). This
> should be fine, since cpu_pm_enter() is supposed to be called only
> with interrupts disabled.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Reviewed-by: Alex Benn?e <alex.bennee@linaro.org>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2017-10-12 17:13 UTC|newest]
Thread overview: 253+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-10 18:38 [PATCH v3 00/28] ARM Scalable Vector Extension (SVE) Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` [PATCH v3 01/28] regset: Add support for dynamically sized regsets Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 14:14 ` Catalin Marinas
2017-10-11 14:14 ` Catalin Marinas
2017-10-11 14:14 ` Catalin Marinas
2017-10-11 14:45 ` Dave Martin
2017-10-11 14:45 ` Dave Martin
2017-10-11 14:45 ` Dave Martin
2017-10-11 14:45 ` Dave Martin
2017-10-10 18:38 ` [PATCH v3 02/28] arm64: KVM: Hide unsupported AArch64 CPU features from guests Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 14:14 ` Catalin Marinas
2017-10-11 14:14 ` Catalin Marinas
2017-10-11 16:21 ` Marc Zyngier
2017-10-11 16:21 ` Marc Zyngier
2017-10-17 13:51 ` Christoffer Dall
2017-10-17 13:51 ` Christoffer Dall
2017-10-17 14:08 ` Marc Zyngier
2017-10-17 14:08 ` Marc Zyngier
2017-10-18 13:20 ` Christoffer Dall
2017-10-18 13:20 ` Christoffer Dall
2017-10-18 14:45 ` Dave Martin
2017-10-18 14:45 ` Dave Martin
2017-10-18 19:19 ` Christoffer Dall
2017-10-18 19:19 ` Christoffer Dall
2017-10-10 18:38 ` [PATCH v3 03/28] arm64: efi: Add missing Kconfig dependency on KERNEL_MODE_NEON Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 14:16 ` Catalin Marinas
2017-10-11 14:16 ` Catalin Marinas
2017-10-11 14:35 ` Dave Martin
2017-10-11 14:35 ` Dave Martin
2017-10-10 18:38 ` [PATCH v3 04/28] arm64: Port deprecated instruction emulation to new sysctl interface Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 14:17 ` Catalin Marinas
2017-10-11 14:17 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 05/28] arm64: fpsimd: Simplify uses of {set, clear}_ti_thread_flag() Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` [PATCH v3 05/28] arm64: fpsimd: Simplify uses of {set,clear}_ti_thread_flag() Dave Martin
2017-10-11 14:19 ` [PATCH v3 05/28] arm64: fpsimd: Simplify uses of {set, clear}_ti_thread_flag() Catalin Marinas
2017-10-11 14:19 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 06/28] arm64/sve: System register and exception syndrome definitions Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 14:20 ` Catalin Marinas
2017-10-11 14:20 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 07/28] arm64/sve: Low-level SVE architectural state manipulation functions Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 14:28 ` Catalin Marinas
2017-10-11 14:28 ` Catalin Marinas
2017-10-11 14:28 ` Catalin Marinas
2017-10-11 14:39 ` Dave Martin
2017-10-11 14:39 ` Dave Martin
2017-10-10 18:38 ` [PATCH v3 08/28] arm64/sve: Kconfig update and conditional compilation support Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 14:29 ` Catalin Marinas
2017-10-11 14:29 ` Catalin Marinas
2017-10-11 14:29 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 09/28] arm64/sve: Signal frame and context structure definition Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 14:29 ` Catalin Marinas
2017-10-11 14:29 ` Catalin Marinas
2017-10-11 14:29 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 10/28] arm64/sve: Low-level CPU setup Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 14:30 ` Catalin Marinas
2017-10-11 14:30 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 11/28] arm64/sve: Core task context handling Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 16:15 ` Catalin Marinas
2017-10-11 16:15 ` Catalin Marinas
2017-10-12 16:05 ` Dave Martin
2017-10-12 16:05 ` Dave Martin
2017-10-13 13:57 ` Catalin Marinas
2017-10-13 13:57 ` Catalin Marinas
2017-10-13 17:53 ` Dave Martin
2017-10-13 17:53 ` Dave Martin
2017-10-10 18:38 ` [PATCH v3 12/28] arm64/sve: Support vector length resetting for new processes Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 16:16 ` Catalin Marinas
2017-10-11 16:16 ` Catalin Marinas
2017-10-11 16:16 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 13/28] arm64/sve: Signal handling support Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 16:40 ` Catalin Marinas
2017-10-11 16:40 ` Catalin Marinas
2017-10-12 16:11 ` Dave Martin
2017-10-12 16:11 ` Dave Martin
2017-10-13 11:17 ` Catalin Marinas
2017-10-13 11:17 ` Catalin Marinas
2017-10-13 11:17 ` Catalin Marinas
2017-10-13 14:26 ` Dave Martin
2017-10-13 14:26 ` Dave Martin
2017-10-10 18:38 ` [PATCH v3 14/28] arm64/sve: Backend logic for setting the vector length Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 16:43 ` Catalin Marinas
2017-10-11 16:43 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 15/28] arm64: cpufeature: Move sys_caps_initialised declarations Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 16:50 ` Catalin Marinas
2017-10-11 16:50 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 16/28] arm64/sve: Probe SVE capabilities and usable vector lengths Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 16:55 ` Catalin Marinas
2017-10-11 16:55 ` Catalin Marinas
2017-10-12 12:56 ` Suzuki K Poulose
2017-10-12 12:56 ` Suzuki K Poulose
2017-10-16 15:46 ` Dave Martin
2017-10-16 15:46 ` Dave Martin
2017-10-16 16:27 ` Suzuki K Poulose
2017-10-16 16:27 ` Suzuki K Poulose
2017-10-16 16:27 ` Suzuki K Poulose
2017-10-16 16:44 ` Dave Martin
2017-10-16 16:44 ` Dave Martin
2017-10-16 16:47 ` Suzuki K Poulose
2017-10-16 16:47 ` Suzuki K Poulose
2017-10-16 16:47 ` Suzuki K Poulose
2017-10-16 16:55 ` Dave Martin
2017-10-16 16:55 ` Dave Martin
2017-10-16 16:58 ` Suzuki K Poulose
2017-10-16 16:58 ` Suzuki K Poulose
2017-10-10 18:38 ` [PATCH v3 17/28] arm64/sve: Preserve SVE registers around kernel-mode NEON use Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-12 10:15 ` Catalin Marinas
2017-10-12 10:15 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 18/28] arm64/sve: Preserve SVE registers around EFI runtime service calls Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-12 10:57 ` Catalin Marinas
2017-10-12 10:57 ` Catalin Marinas
2017-10-12 10:57 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 19/28] arm64/sve: ptrace and ELF coredump support Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-12 17:06 ` Catalin Marinas
2017-10-12 17:06 ` Catalin Marinas
2017-10-13 16:16 ` Dave Martin
2017-10-13 16:16 ` Dave Martin
2017-10-13 16:16 ` Dave Martin
2017-10-18 10:32 ` Catalin Marinas
2017-10-18 10:32 ` Catalin Marinas
2017-10-18 16:02 ` Dave Martin
2017-10-18 16:02 ` Dave Martin
2017-10-10 18:38 ` [PATCH v3 20/28] arm64/sve: Add prctl controls for userspace vector length management Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-12 17:11 ` Catalin Marinas
2017-10-12 17:11 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 21/28] arm64/sve: Add sysctl to set the default vector length for new processes Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-12 17:11 ` Catalin Marinas
2017-10-12 17:11 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 22/28] arm64/sve: KVM: Prevent guests from using SVE Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 16:28 ` Marc Zyngier
2017-10-11 16:28 ` Marc Zyngier
2017-10-12 11:04 ` Dave Martin
2017-10-12 11:04 ` Dave Martin
2017-10-12 11:28 ` Marc Zyngier
2017-10-12 11:28 ` Marc Zyngier
2017-10-13 14:15 ` Dave Martin
2017-10-13 14:15 ` Dave Martin
2017-10-13 14:21 ` Marc Zyngier
2017-10-13 14:21 ` Marc Zyngier
2017-10-13 16:47 ` Dave Martin
2017-10-13 16:47 ` Dave Martin
2017-10-12 17:13 ` Catalin Marinas [this message]
2017-10-12 17:13 ` Catalin Marinas
2017-10-17 11:50 ` Christoffer Dall
2017-10-17 11:50 ` Christoffer Dall
2017-10-17 11:50 ` Christoffer Dall
2017-10-17 11:50 ` Christoffer Dall
2017-10-17 14:31 ` Dave Martin
2017-10-17 14:31 ` Dave Martin
2017-10-18 13:23 ` Christoffer Dall
2017-10-18 13:23 ` Christoffer Dall
2017-10-18 15:00 ` Dave Martin
2017-10-18 15:00 ` Dave Martin
2017-10-18 19:22 ` Christoffer Dall
2017-10-18 19:22 ` Christoffer Dall
2017-10-10 18:38 ` [PATCH v3 23/28] arm64/sve: KVM: Treat guest SVE use as undefined instruction execution Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-12 17:13 ` Catalin Marinas
2017-10-12 17:13 ` Catalin Marinas
2017-10-17 13:58 ` Christoffer Dall
2017-10-17 13:58 ` Christoffer Dall
2017-10-10 18:38 ` [PATCH v3 24/28] arm64/sve: KVM: Hide SVE from CPU features exposed to guests Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 16:31 ` Marc Zyngier
2017-10-11 16:31 ` Marc Zyngier
2017-10-12 17:13 ` Catalin Marinas
2017-10-12 17:13 ` Catalin Marinas
2017-10-17 13:58 ` Christoffer Dall
2017-10-17 13:58 ` Christoffer Dall
2017-10-17 14:07 ` Dave Martin
2017-10-17 14:07 ` Dave Martin
2017-10-17 14:29 ` Marc Zyngier
2017-10-17 14:29 ` Marc Zyngier
2017-10-17 14:29 ` Marc Zyngier
2017-10-17 15:47 ` Dave Martin
2017-10-17 15:47 ` Dave Martin
2017-10-18 13:21 ` Christoffer Dall
2017-10-18 13:21 ` Christoffer Dall
2017-10-18 15:01 ` Dave Martin
2017-10-18 15:01 ` Dave Martin
2017-10-18 16:49 ` Christoffer Dall
2017-10-18 16:49 ` Christoffer Dall
2017-10-10 18:38 ` [PATCH v3 25/28] arm64/sve: Detect SVE and activate runtime support Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 17:11 ` Suzuki K Poulose
2017-10-11 17:11 ` Suzuki K Poulose
2017-10-12 17:14 ` Catalin Marinas
2017-10-12 17:14 ` Catalin Marinas
2017-10-12 17:14 ` Catalin Marinas
2017-10-10 18:38 ` [PATCH v3 26/28] arm64/sve: Add documentation Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 9:50 ` Szabolcs Nagy
2017-10-11 9:50 ` Szabolcs Nagy
[not found] ` <59DDE958.4080605-5wv7dgnIgG8@public.gmane.org>
2017-10-11 11:08 ` Dave Martin
2017-10-11 11:08 ` Dave Martin
2017-10-11 11:08 ` Dave Martin
[not found] ` <20171011110811.GB19485-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2017-10-11 11:30 ` Szabolcs Nagy
2017-10-11 11:30 ` Szabolcs Nagy
2017-10-11 11:30 ` Szabolcs Nagy
2017-10-13 14:24 ` Catalin Marinas
2017-10-13 14:24 ` Catalin Marinas
2017-10-13 17:17 ` Dave Martin
2017-10-13 17:17 ` Dave Martin
[not found] ` <20171013171758.GO19485-M5GwZQ6tE7x5pKCnmE3YQBJ8xKzm50AiAL8bYrjMMd8@public.gmane.org>
2017-10-18 9:32 ` Catalin Marinas
2017-10-18 9:32 ` Catalin Marinas
2017-10-18 9:32 ` Catalin Marinas
[not found] ` <20171013142421.j32jzisukewxtosx-+1aNUgJU5qkijLcmloz0ER/iLCjYCKR+VpNB7YpNyf8@public.gmane.org>
2017-10-13 17:35 ` Dave Martin
2017-10-13 17:35 ` Dave Martin
2017-10-13 17:35 ` Dave Martin
2017-10-10 18:38 ` [RFC PATCH v3 27/28] arm64: signal: Report signal frame size to userspace via auxv Dave Martin
2017-10-10 18:38 ` Dave Martin
2017-10-11 10:19 ` Szabolcs Nagy
2017-10-11 10:19 ` Szabolcs Nagy
2017-10-11 13:14 ` Dave P Martin
2017-10-11 13:14 ` Dave P Martin
2017-10-10 18:38 ` [RFC PATCH v3 28/28] arm64/sve: signal: Include SVE when computing AT_MINSIGSTKSZ Dave Martin
2017-10-10 18:38 ` Dave Martin
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