From: "Alex Bennée" <alex.bennee@linaro.org>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: Okamoto Takayuki <tokamoto@jp.fujitsu.com>,
Christoffer Dall <cdall@kernel.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Marc Zyngier <marc.zyngier@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
kvmarm@lists.cs.columbia.edu, Dave Martin <Dave.Martin@arm.com>,
arm-mail-list <linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC PATCH 00/16] KVM: arm64: Initial support for SVE guests
Date: Fri, 06 Jul 2018 11:11:39 +0100 [thread overview]
Message-ID: <87601s8yhw.fsf@linaro.org> (raw)
In-Reply-To: <CAFEAcA8NQFvHzgCvCQBmq7us4PvqSFK2Le=pMiz5dE4D3WGXdQ@mail.gmail.com>
Peter Maydell <peter.maydell@linaro.org> writes:
> On 6 July 2018 at 10:20, Alex Bennée <alex.bennee@linaro.org> wrote:
>> For the most part in QEMU with KVM we just treat the list of registers
>> we get from the OS as an opaque blob of things we save to memory and
>> pass back.
>
> This is specifically not the case for the SVE registers -- we
> will need extra code to handle them. (The current code only
> allows for the possibility of 64-bit registers, so if we'd
> allowed the kernel to hand it the larger SVE registers it would
> just have fallen over. This is why QEMU needs to specifically
> enable SVE via the VCPU_INIT call.)
Ahh right. So currently both the KVM_GET_REG_LIST and the core registers
use KVM_GET/SET_ONE_REG which certainly won't do the trick. So I guess
we need another IOCTL (or to enhance the current one) and a KVM
capability bit as well?
>
> thanks
> -- PMM
--
Alex Bennée
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WARNING: multiple messages have this Message-ID (diff)
From: alex.bennee@linaro.org (Alex Bennée)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 00/16] KVM: arm64: Initial support for SVE guests
Date: Fri, 06 Jul 2018 11:11:39 +0100 [thread overview]
Message-ID: <87601s8yhw.fsf@linaro.org> (raw)
In-Reply-To: <CAFEAcA8NQFvHzgCvCQBmq7us4PvqSFK2Le=pMiz5dE4D3WGXdQ@mail.gmail.com>
Peter Maydell <peter.maydell@linaro.org> writes:
> On 6 July 2018 at 10:20, Alex Benn?e <alex.bennee@linaro.org> wrote:
>> For the most part in QEMU with KVM we just treat the list of registers
>> we get from the OS as an opaque blob of things we save to memory and
>> pass back.
>
> This is specifically not the case for the SVE registers -- we
> will need extra code to handle them. (The current code only
> allows for the possibility of 64-bit registers, so if we'd
> allowed the kernel to hand it the larger SVE registers it would
> just have fallen over. This is why QEMU needs to specifically
> enable SVE via the VCPU_INIT call.)
Ahh right. So currently both the KVM_GET_REG_LIST and the core registers
use KVM_GET/SET_ONE_REG which certainly won't do the trick. So I guess
we need another IOCTL (or to enhance the current one) and a KVM
capability bit as well?
>
> thanks
> -- PMM
--
Alex Benn?e
next prev parent reply other threads:[~2018-07-06 9:59 UTC|newest]
Thread overview: 178+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-21 14:57 [RFC PATCH 00/16] KVM: arm64: Initial support for SVE guests Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-06-21 14:57 ` [RFC PATCH 01/16] arm64: fpsimd: Always set TIF_FOREIGN_FPSTATE on task state flush Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-06 9:07 ` Alex Bennée
2018-07-06 9:07 ` Alex Bennée
2018-06-21 14:57 ` [RFC PATCH 02/16] KVM: arm64: Delete orphaned declaration for __fpsimd_enabled() Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-06 9:08 ` Alex Bennée
2018-07-06 9:08 ` Alex Bennée
2018-06-21 14:57 ` [RFC PATCH 03/16] KVM: arm64: Refactor kvm_arm_num_regs() for easier maintenance Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-06 9:20 ` Alex Bennée
2018-07-06 9:20 ` Alex Bennée
2018-06-21 14:57 ` [RFC PATCH 04/16] KVM: arm64: Add missing #include of <linux/bitmap.h> to kvm_host.h Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-06 9:21 ` Alex Bennée
2018-07-06 9:21 ` Alex Bennée
2018-06-21 14:57 ` [RFC PATCH 05/16] KVM: arm: Add arch init/uninit hooks Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-06 10:02 ` Alex Bennée
2018-07-06 10:02 ` Alex Bennée
2018-07-09 15:15 ` Dave Martin
2018-07-09 15:15 ` Dave Martin
2018-06-21 14:57 ` [RFC PATCH 06/16] arm64/sve: Determine virtualisation-friendly vector lengths Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-06 13:20 ` Marc Zyngier
2018-07-06 13:20 ` Marc Zyngier
2018-06-21 14:57 ` [RFC PATCH 07/16] arm64/sve: Enable SVE state tracking for non-task contexts Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-25 13:58 ` Alex Bennée
2018-07-25 13:58 ` Alex Bennée
2018-07-25 14:39 ` Dave Martin
2018-07-25 14:39 ` Dave Martin
2018-06-21 14:57 ` [RFC PATCH 08/16] KVM: arm64: Support dynamically hideable system registers Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-25 14:12 ` Alex Bennée
2018-07-25 14:12 ` Alex Bennée
2018-07-25 14:36 ` Dave Martin
2018-07-25 14:36 ` Dave Martin
2018-07-25 15:41 ` Alex Bennée
2018-07-25 15:41 ` Alex Bennée
2018-07-26 12:53 ` Dave Martin
2018-07-26 12:53 ` Dave Martin
2018-08-07 19:20 ` Christoffer Dall
2018-08-07 19:20 ` Christoffer Dall
2018-08-08 8:33 ` Dave Martin
2018-08-08 8:33 ` Dave Martin
2018-06-21 14:57 ` [RFC PATCH 09/16] KVM: arm64: Allow ID registers to by dynamically read-as-zero Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-25 15:46 ` Alex Bennée
2018-07-25 15:46 ` Alex Bennée
2018-08-06 13:03 ` Christoffer Dall
2018-08-06 13:03 ` Christoffer Dall
2018-08-07 11:09 ` Dave Martin
2018-08-07 11:09 ` Dave Martin
2018-08-07 19:35 ` Christoffer Dall
2018-08-07 19:35 ` Christoffer Dall
2018-08-08 9:11 ` Dave Martin
2018-08-08 9:11 ` Dave Martin
2018-08-08 9:58 ` Christoffer Dall
2018-08-08 9:58 ` Christoffer Dall
2018-08-08 14:03 ` Peter Maydell
2018-08-08 14:03 ` Peter Maydell
2018-08-09 10:19 ` Dave Martin
2018-08-09 10:19 ` Dave Martin
2018-06-21 14:57 ` [RFC PATCH 10/16] KVM: arm64: Add a vcpu flag to control SVE visibility for the guest Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-19 11:08 ` Andrew Jones
2018-07-19 11:08 ` Andrew Jones
2018-07-25 11:41 ` Dave Martin
2018-07-25 11:41 ` Dave Martin
2018-07-25 13:43 ` Andrew Jones
2018-07-25 13:43 ` Andrew Jones
2018-07-25 14:41 ` Dave Martin
2018-07-25 14:41 ` Dave Martin
2018-07-19 15:02 ` Andrew Jones
2018-07-19 15:02 ` Andrew Jones
2018-07-25 11:48 ` Dave Martin
2018-07-25 11:48 ` Dave Martin
2018-06-21 14:57 ` [RFC PATCH 11/16] KVM: arm64/sve: System register context switch and access support Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-19 11:11 ` Andrew Jones
2018-07-19 11:11 ` Andrew Jones
2018-07-25 11:45 ` Dave Martin
2018-07-25 11:45 ` Dave Martin
2018-06-21 14:57 ` [RFC PATCH 12/16] KVM: arm64/sve: Context switch the SVE registers Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-19 13:13 ` Andrew Jones
2018-07-19 13:13 ` Andrew Jones
2018-07-25 11:50 ` Dave Martin
2018-07-25 11:50 ` Dave Martin
2018-07-25 13:57 ` Andrew Jones
2018-07-25 13:57 ` Andrew Jones
2018-07-25 14:12 ` Dave Martin
2018-07-25 14:12 ` Dave Martin
2018-08-06 13:19 ` Christoffer Dall
2018-08-06 13:19 ` Christoffer Dall
2018-08-07 11:15 ` Dave Martin
2018-08-07 11:15 ` Dave Martin
2018-08-07 19:43 ` Christoffer Dall
2018-08-07 19:43 ` Christoffer Dall
2018-08-08 8:23 ` Dave Martin
2018-08-08 8:23 ` Dave Martin
2018-06-21 14:57 ` [RFC PATCH 13/16] KVM: Allow 2048-bit register access via KVM_{GET, SET}_ONE_REG Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-25 15:58 ` Alex Bennée
2018-07-25 15:58 ` Alex Bennée
2018-07-26 12:58 ` Dave Martin
2018-07-26 12:58 ` Dave Martin
2018-07-26 13:55 ` Alex Bennée
2018-07-26 13:55 ` Alex Bennée
2018-07-27 9:26 ` Dave Martin
2018-07-27 9:26 ` Dave Martin
2018-06-21 14:57 ` [RFC PATCH 14/16] KVM: arm64/sve: Add SVE support to register access ioctl interface Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-19 13:04 ` Andrew Jones
2018-07-19 13:04 ` Andrew Jones
2018-07-25 14:06 ` Dave Martin
2018-07-25 14:06 ` Dave Martin
2018-07-25 17:20 ` Andrew Jones
2018-07-25 17:20 ` Andrew Jones
2018-07-26 13:10 ` Dave Martin
2018-07-26 13:10 ` Dave Martin
2018-08-03 14:57 ` Dave Martin
2018-08-03 14:57 ` Dave Martin
2018-08-03 15:11 ` Andrew Jones
2018-08-03 15:11 ` Andrew Jones
2018-08-03 15:38 ` Dave Martin
2018-08-03 15:38 ` Dave Martin
2018-08-06 13:25 ` Christoffer Dall
2018-08-06 13:25 ` Christoffer Dall
2018-08-07 11:17 ` Dave Martin
2018-08-07 11:17 ` Dave Martin
2018-06-21 14:57 ` [RFC PATCH 15/16] KVM: arm64: Enumerate SVE register indices for KVM_GET_REG_LIST Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-19 14:12 ` Andrew Jones
2018-07-19 14:12 ` Andrew Jones
2018-07-25 14:50 ` Dave Martin
2018-07-25 14:50 ` Dave Martin
2018-06-21 14:57 ` [RFC PATCH 16/16] KVM: arm64/sve: Report and enable SVE API extensions for userspace Dave Martin
2018-06-21 14:57 ` Dave Martin
2018-07-19 14:59 ` Andrew Jones
2018-07-19 14:59 ` Andrew Jones
2018-07-25 15:27 ` Dave Martin
2018-07-25 15:27 ` Dave Martin
2018-07-25 16:52 ` Andrew Jones
2018-07-25 16:52 ` Andrew Jones
2018-07-26 13:18 ` Dave Martin
2018-07-26 13:18 ` Dave Martin
2018-08-06 13:41 ` Christoffer Dall
2018-08-06 13:41 ` Christoffer Dall
2018-08-07 11:23 ` Dave Martin
2018-08-07 11:23 ` Dave Martin
2018-08-07 20:08 ` Christoffer Dall
2018-08-07 20:08 ` Christoffer Dall
2018-08-08 8:30 ` Dave Martin
2018-08-08 8:30 ` Dave Martin
2018-07-19 15:24 ` Andrew Jones
2018-07-19 15:24 ` Andrew Jones
2018-07-26 13:23 ` Dave Martin
2018-07-26 13:23 ` Dave Martin
2018-07-06 8:22 ` [RFC PATCH 00/16] KVM: arm64: Initial support for SVE guests Alex Bennée
2018-07-06 8:22 ` Alex Bennée
2018-07-06 9:05 ` Dave Martin
2018-07-06 9:05 ` Dave Martin
2018-07-06 9:20 ` Alex Bennée
2018-07-06 9:20 ` Alex Bennée
2018-07-06 9:23 ` Peter Maydell
2018-07-06 9:23 ` Peter Maydell
2018-07-06 10:11 ` Alex Bennée [this message]
2018-07-06 10:11 ` Alex Bennée
2018-07-06 10:14 ` Peter Maydell
2018-07-06 10:14 ` Peter Maydell
2018-08-06 13:05 ` Christoffer Dall
2018-08-06 13:05 ` Christoffer Dall
2018-08-07 11:18 ` Dave Martin
2018-08-07 11:18 ` Dave Martin
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