From: Catalin Marinas <catalin.marinas@arm.com>
To: Fuad Tabba <fuad.tabba@linux.dev>
Cc: Marc Zyngier <maz@kernel.org>, Oliver Upton <oupton@kernel.org>,
kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
Will Deacon <will@kernel.org>, Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Steffen Eiden <seiden@linux.ibm.com>,
Mark Rutland <mark.rutland@arm.com>,
Yicong Yang <yangyicong@hisilicon.com>,
Zhou Wang <wangzhou1@hisilicon.com>,
Arnd Bergmann <arnd@arndb.de>, Fuad Tabba <tabba@google.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 3/5] KVM: arm64: Add context-switch of ACCDATA_EL1
Date: Thu, 29 Oct 2026 21:15:18 +0000 [thread overview]
Message-ID: <auO3ZuB74waA_bPD@arm.com> (raw)
In-Reply-To: <20261025075138.2919734-4-fuad.tabba@linux.dev>
On Sun, Oct 25, 2026 at 07:51:36AM +0000, Fuad Tabba wrote:
> From: Marc Zyngier <maz@kernel.org>
>
> Add ACCDATA_EL1 save/restore as part of the EL0 context. This is
> conditioned on the guest's view of ID_AA64ISAR1_EL1.LS64 reporting
> that this register is supported.
>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> Fixes: 58ce78667a641 ("arm64: Add support for FEAT_{LS64, LS64_V}")
> Link: https://lore.kernel.org/r/20240815125959.2097734-5-maz@kernel.org
> Cc: stable@vger.kernel.org
> [Fuad: rebased; switch ACCDATA_EL1 for guests only, as the host never
> uses it; gate it on a new ARM64_HAS_LS64_ACCDATA capability, since
> in pKVM the host controls a non-protected guest's ID registers, and
> an EL2 access to ACCDATA_EL1 on a CPU without the feature is UNDEFINED]
> Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2026-10-29 21:15 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-25 7:51 [PATCH v2 0/5] KVM: arm64: Support FEAT_LS64_ACCDATA in guests Fuad Tabba
2026-10-25 7:51 ` [PATCH v2 1/5] arm64: Add override for ID_AA64ISAR1_EL1.LS64 Fuad Tabba
2026-10-29 21:14 ` Catalin Marinas
2026-10-25 7:51 ` [PATCH v2 2/5] KVM: arm64: Add ACCDATA_EL1 to the sysreg array Fuad Tabba
2026-10-25 7:51 ` [PATCH v2 3/5] KVM: arm64: Add context-switch of ACCDATA_EL1 Fuad Tabba
2026-10-26 15:41 ` Suzuki K Poulose
2026-10-26 17:09 ` Fuad Tabba
2026-10-26 17:32 ` Arnd Bergmann
2026-10-26 18:54 ` Fuad Tabba
2026-10-29 21:15 ` Catalin Marinas [this message]
2026-10-25 7:51 ` [PATCH v2 4/5] KVM: arm64: Enable ST64BV0 for guests with FEAT_LS64_ACCDATA Fuad Tabba
2026-10-25 7:51 ` [PATCH v2 5/5] KVM: arm64: selftests: Add ACCDATA_EL1 to get-reg-list Fuad Tabba
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