From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org
Cc: dave.martin@arm.com, daniel.kiss@arm.com,
Will Deacon <will@kernel.org>,
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, kernel-team@android.com
Subject: [PATCH 00/10] KVM: arm64: Enable SVE support on nVHE systems
Date: Tue, 16 Mar 2021 10:13:02 +0000 [thread overview]
Message-ID: <20210316101312.102925-1-maz@kernel.org> (raw)
This series enables SVE support for KVM on nVHE hardware (or more
likely, software models), and is an alternative to Daniel's patch[1]
which has gone through 3 versions, but still has a number of issues.
Instead of waiting for things to happen, I decided to try and see what
I could come up with.
The SVE save/restore is modelled after the SVE VHE flow, itself
closely following the FPSIMD flow:
- the guest traps to EL2 on first SVE access, and will not trap
anymore until vcpu_put()
- ZCR_EL2 stays constant as long as the guest has SVE enabled
- on vcpu_put(), ZCR_EL2 is restored to the default value
Most of this series only repaints things so that VHE and nVHE look as
similar as possible, the ZCR_EL2 management being the most visible
exception. This results in a bunch of preparatory patches that aim at
making the code slightly more readable.
This has been tested on a FVP model with both VHE.nVHE configurations
using the string tests included with the "optimized-routines"
library[2].
Patches against 5.12-rc2.
[1] https://lore.kernel.org/r/20210302164850.3553701-1-daniel.kiss@arm.com
[2] https://github.com/ARM-software/optimized-routines
Daniel Kiss (1):
KVM: arm64: Enable SVE support for nVHE
Marc Zyngier (9):
KVM: arm64: Provide KVM's own save/restore SVE primitives
KVM: arm64: Use {read,write}_sysreg_el1 to access ZCR_EL1
KVM: arm64: Let vcpu_sve_pffr() handle HYP VAs
KVM: arm64: Introduce vcpu_sve_vq() helper
KVM: arm64: Rework SVE host-save/guest-restore
KVM: arm64: Map SVE context at EL2 when available
KVM: arm64: Save guest's ZCR_EL1 before saving the FPSIMD state
KVM: arm64: Add a nVHE-specific SVE VQ reset hypercall
KVM: arm64: Save/restore SVE state for nVHE
arch/arm64/Kconfig | 7 ---
arch/arm64/include/asm/fpsimdmacros.h | 10 +++-
arch/arm64/include/asm/kvm_asm.h | 1 +
arch/arm64/include/asm/kvm_host.h | 25 +++-----
arch/arm64/include/asm/kvm_hyp.h | 2 +
arch/arm64/kvm/arm.c | 5 --
arch/arm64/kvm/fpsimd.c | 31 ++++++++--
arch/arm64/kvm/guest.c | 6 +-
arch/arm64/kvm/hyp/fpsimd.S | 10 ++++
arch/arm64/kvm/hyp/include/hyp/switch.h | 78 ++++++++++++-------------
arch/arm64/kvm/hyp/nvhe/hyp-main.c | 8 +++
arch/arm64/kvm/hyp/nvhe/switch.c | 4 +-
arch/arm64/kvm/reset.c | 4 --
13 files changed, 107 insertions(+), 84 deletions(-)
--
2.29.2
next reply other threads:[~2021-03-16 10:14 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-16 10:13 Marc Zyngier [this message]
2021-03-16 10:13 ` [PATCH 01/10] KVM: arm64: Provide KVM's own save/restore SVE primitives Marc Zyngier
2021-03-16 10:31 ` Quentin Perret
2021-03-16 12:17 ` Marc Zyngier
2021-03-17 14:30 ` Will Deacon
2021-03-16 10:13 ` [PATCH 02/10] KVM: arm64: Use {read,write}_sysreg_el1 to access ZCR_EL1 Marc Zyngier
2021-03-17 14:31 ` Will Deacon
2021-03-16 10:13 ` [PATCH 03/10] KVM: arm64: Let vcpu_sve_pffr() handle HYP VAs Marc Zyngier
2021-03-17 14:31 ` Will Deacon
2021-03-16 10:13 ` [PATCH 04/10] KVM: arm64: Introduce vcpu_sve_vq() helper Marc Zyngier
2021-03-17 14:01 ` Will Deacon
2021-03-16 10:13 ` [PATCH 05/10] KVM: arm64: Rework SVE host-save/guest-restore Marc Zyngier
2021-03-17 14:29 ` Will Deacon
2021-03-17 14:54 ` Marc Zyngier
2021-03-16 10:13 ` [PATCH 06/10] KVM: arm64: Map SVE context at EL2 when available Marc Zyngier
2021-03-17 16:01 ` Will Deacon
2021-03-18 8:56 ` Marc Zyngier
2021-03-16 10:13 ` [PATCH 07/10] KVM: arm64: Save guest's ZCR_EL1 before saving the FPSIMD state Marc Zyngier
2021-03-17 17:17 ` Will Deacon
2021-03-17 17:20 ` Will Deacon
2021-03-16 10:13 ` [PATCH 08/10] KVM: arm64: Add a nVHE-specific SVE VQ reset hypercall Marc Zyngier
2021-03-16 10:45 ` Quentin Perret
2021-03-16 12:18 ` Marc Zyngier
2021-03-16 14:24 ` Andrew Scull
2021-03-16 15:00 ` Marc Zyngier
2021-03-16 10:13 ` [PATCH 09/10] KVM: arm64: Save/restore SVE state for nVHE Marc Zyngier
2021-03-17 17:57 ` Will Deacon
2021-03-18 9:12 ` Marc Zyngier
2021-03-16 10:13 ` [PATCH 10/10] KVM: arm64: Enable SVE support " Marc Zyngier
2021-03-17 18:00 ` Will Deacon
2021-03-18 9:14 ` Marc Zyngier
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