From: Marc Zyngier <maz@kernel.org>
To: Will Deacon <will@kernel.org>
Cc: kvm@vger.kernel.org, Catalin Marinas <catalin.marinas@arm.com>,
kvmarm@lists.cs.columbia.edu, broonie@kernel.org,
kernel-team@android.com, dave.martin@arm.com,
linux-arm-kernel@lists.infradead.org, daniel.kiss@arm.com
Subject: Re: [PATCH v2 09/11] KVM: arm64: Trap host SVE accesses when the FPSIMD state is dirty
Date: Thu, 18 Mar 2021 14:29:02 +0000 [thread overview]
Message-ID: <871rccilht.wl-maz@kernel.org> (raw)
In-Reply-To: <20210318141144.GE7055@willie-the-truck>
On Thu, 18 Mar 2021 14:11:44 +0000,
Will Deacon <will@kernel.org> wrote:
>
> On Thu, Mar 18, 2021 at 12:25:30PM +0000, Marc Zyngier wrote:
> > ZCR_EL2 controls the upper bound for ZCR_EL1, and is set to
> > a potentially lower limit when the guest uses SVE. In order
> > to restore the SVE state on the EL1 host, we must first
> > reset ZCR_EL2 to its original value.
> >
> > To make it as lazy as possible on the EL1 host side, set
> > the SVE trapping in place when returning exiting from
>
> "returning exiting"?
Meh. Kept the latter.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: Will Deacon <will@kernel.org>
Cc: kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org,
dave.martin@arm.com, daniel.kiss@arm.com,
Catalin Marinas <catalin.marinas@arm.com>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
broonie@kernel.org, ascull@google.com, qperret@google.com,
kernel-team@android.com
Subject: Re: [PATCH v2 09/11] KVM: arm64: Trap host SVE accesses when the FPSIMD state is dirty
Date: Thu, 18 Mar 2021 14:29:02 +0000 [thread overview]
Message-ID: <871rccilht.wl-maz@kernel.org> (raw)
In-Reply-To: <20210318141144.GE7055@willie-the-truck>
On Thu, 18 Mar 2021 14:11:44 +0000,
Will Deacon <will@kernel.org> wrote:
>
> On Thu, Mar 18, 2021 at 12:25:30PM +0000, Marc Zyngier wrote:
> > ZCR_EL2 controls the upper bound for ZCR_EL1, and is set to
> > a potentially lower limit when the guest uses SVE. In order
> > to restore the SVE state on the EL1 host, we must first
> > reset ZCR_EL2 to its original value.
> >
> > To make it as lazy as possible on the EL1 host side, set
> > the SVE trapping in place when returning exiting from
>
> "returning exiting"?
Meh. Kept the latter.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: Will Deacon <will@kernel.org>
Cc: kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org,
dave.martin@arm.com, daniel.kiss@arm.com,
Catalin Marinas <catalin.marinas@arm.com>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
broonie@kernel.org, ascull@google.com, qperret@google.com,
kernel-team@android.com
Subject: Re: [PATCH v2 09/11] KVM: arm64: Trap host SVE accesses when the FPSIMD state is dirty
Date: Thu, 18 Mar 2021 14:29:02 +0000 [thread overview]
Message-ID: <871rccilht.wl-maz@kernel.org> (raw)
In-Reply-To: <20210318141144.GE7055@willie-the-truck>
On Thu, 18 Mar 2021 14:11:44 +0000,
Will Deacon <will@kernel.org> wrote:
>
> On Thu, Mar 18, 2021 at 12:25:30PM +0000, Marc Zyngier wrote:
> > ZCR_EL2 controls the upper bound for ZCR_EL1, and is set to
> > a potentially lower limit when the guest uses SVE. In order
> > to restore the SVE state on the EL1 host, we must first
> > reset ZCR_EL2 to its original value.
> >
> > To make it as lazy as possible on the EL1 host side, set
> > the SVE trapping in place when returning exiting from
>
> "returning exiting"?
Meh. Kept the latter.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
next prev parent reply other threads:[~2021-03-18 14:29 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-18 12:25 [PATCH v2 00/11] KVM: arm64: Enable SVE support on nVHE systems Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` [PATCH v2 01/11] KVM: arm64: Provide KVM's own save/restore SVE primitives Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` [PATCH v2 02/11] KVM: arm64: Use {read, write}_sysreg_el1 to access ZCR_EL1 Marc Zyngier
2021-03-18 12:25 ` [PATCH v2 02/11] KVM: arm64: Use {read,write}_sysreg_el1 " Marc Zyngier
2021-03-18 12:25 ` [PATCH v2 02/11] KVM: arm64: Use {read, write}_sysreg_el1 " Marc Zyngier
2021-03-18 12:25 ` [PATCH v2 03/11] KVM: arm64: Let vcpu_sve_pffr() handle HYP VAs Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` [PATCH v2 04/11] KVM: arm64: Introduce vcpu_sve_vq() helper Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` [PATCH v2 05/11] arm64: sve: Provide a conditional update accessor for ZCR_ELx Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 13:32 ` Will Deacon
2021-03-18 13:32 ` Will Deacon
2021-03-18 13:32 ` Will Deacon
2021-03-19 16:42 ` Mark Brown
2021-03-19 16:42 ` Mark Brown
2021-03-19 16:42 ` Mark Brown
2021-03-19 16:51 ` Marc Zyngier
2021-03-19 16:51 ` Marc Zyngier
2021-03-19 16:51 ` Marc Zyngier
2021-03-19 16:58 ` Mark Brown
2021-03-19 16:58 ` Mark Brown
2021-03-19 16:58 ` Mark Brown
2021-03-18 12:25 ` [PATCH v2 06/11] KVM: arm64: Rework SVE host-save/guest-restore Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 13:34 ` Will Deacon
2021-03-18 13:34 ` Will Deacon
2021-03-18 13:34 ` Will Deacon
2021-03-18 12:25 ` [PATCH v2 07/11] KVM: arm64: Map SVE context at EL2 when available Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 13:35 ` Will Deacon
2021-03-18 13:35 ` Will Deacon
2021-03-18 13:35 ` Will Deacon
2021-03-18 12:25 ` [PATCH v2 08/11] KVM: arm64: Save guest's ZCR_EL1 before saving the FPSIMD state Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` [PATCH v2 09/11] KVM: arm64: Trap host SVE accesses when the FPSIMD state is dirty Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 14:11 ` Will Deacon
2021-03-18 14:11 ` Will Deacon
2021-03-18 14:11 ` Will Deacon
2021-03-18 14:29 ` Marc Zyngier [this message]
2021-03-18 14:29 ` Marc Zyngier
2021-03-18 14:29 ` Marc Zyngier
2021-03-18 18:40 ` Marc Zyngier
2021-03-18 18:40 ` Marc Zyngier
2021-03-18 18:40 ` Marc Zyngier
2021-03-18 12:25 ` [PATCH v2 10/11] KVM: arm64: Save/restore SVE state for nVHE Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 14:13 ` Will Deacon
2021-03-18 14:13 ` Will Deacon
2021-03-18 14:13 ` Will Deacon
2021-03-18 14:32 ` Marc Zyngier
2021-03-18 14:32 ` Marc Zyngier
2021-03-18 14:32 ` Marc Zyngier
2021-03-18 12:25 ` [PATCH v2 11/11] KVM: arm64: Enable SVE support " Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-18 12:25 ` Marc Zyngier
2021-03-19 17:53 ` [PATCH v2 00/11] KVM: arm64: Enable SVE support on nVHE systems Mark Brown
2021-03-19 17:53 ` Mark Brown
2021-03-19 17:53 ` Mark Brown
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