From: Marc Zyngier <maz@kernel.org>
To: Tangnianyao <tangnianyao@huawei.com>
Cc: <kvmarm@lists.linux.dev>, <kvm@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Oliver Upton <oliver.upton@linux.dev>,
Zenghui Yu <yuzenghui@huawei.com>,
Quentin Perret <qperret@google.com>,
Will Deacon <will@kernel.org>, Fuad Tabba <tabba@google.com>,
"guoyang (C)" <guoyang2@huawei.com>
Subject: Re: [PATCH v3 00/17] KVM: arm64: Allow using VHE in the nVHE hypervisor
Date: Wed, 10 Jul 2024 09:51:24 +0100 [thread overview]
Message-ID: <86zfqp3a0j.wl-maz@kernel.org> (raw)
In-Reply-To: <5ab07210-ad44-616c-cd15-0ac954453fcf@huawei.com>
On Wed, 10 Jul 2024 07:45:52 +0100,
Tangnianyao <tangnianyao@huawei.com> wrote:
>
> Hi Marz,
>
> I'm trying to learn pKVM and have a question.
>
> Why pKVM developed on E2H=0 firstly? It tried to avoid host access
> guest memory with stage2 translation, and it seems not necessarily
> rely on HCR_EL2.E2H=0.
Because we don't want to leave ARMv8.0 systems behind. They are still
a large portion of the arm64 HW running Linux.
> Is hVHE an alternative plan of pKVM ? To allow pKVM run on E2H res1 system ?
Supporting E2H RES1 implementations is indeed one of the motivations.
But there is a lot more to it, such as being able to use the two TTBRs
to perform address space isolation inside the hypervisor.
I presented this[1] at KVM Forum two years ago, which explains what we
could do (some of which is already in progress).
M.
[1] https://static.sched.com/hosted_files/kvmforum2022/b4/NYSM-NYD-KVM-2022.pdf
--
Without deviation from the norm, progress is not possible.
prev parent reply other threads:[~2024-07-10 8:51 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-09 16:21 [PATCH v3 00/17] KVM: arm64: Allow using VHE in the nVHE hypervisor Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-09 16:21 ` [PATCH v3 01/17] KVM: arm64: Drop is_kernel_in_hyp_mode() from __invalidate_icache_guest_page() Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-13 8:20 ` Shaoqin Huang
2023-06-09 16:21 ` [PATCH v3 02/17] arm64: Prevent the use of is_kernel_in_hyp_mode() in hypervisor code Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-12 16:59 ` Catalin Marinas
2023-06-12 16:59 ` Catalin Marinas
2023-06-13 8:25 ` Shaoqin Huang
2023-06-13 8:25 ` Shaoqin Huang
2023-06-09 16:21 ` [PATCH v3 03/17] arm64: Turn kaslr_feature_override into a generic SW feature override Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-12 17:16 ` Catalin Marinas
2023-06-12 17:16 ` Catalin Marinas
2023-06-14 7:26 ` Shaoqin Huang
2023-06-14 7:26 ` Shaoqin Huang
2023-06-09 16:21 ` [PATCH v3 04/17] arm64: Add KVM_HVHE capability and has_hvhe() predicate Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-12 17:24 ` Catalin Marinas
2023-06-12 17:24 ` Catalin Marinas
2023-06-14 7:32 ` Shaoqin Huang
2023-06-14 7:35 ` Shaoqin Huang
2023-06-14 7:35 ` Shaoqin Huang
2023-06-14 16:06 ` Marc Zyngier
2023-06-14 16:06 ` Marc Zyngier
2023-06-09 16:21 ` [PATCH v3 05/17] arm64: Don't enable VHE for the kernel if OVERRIDE_HVHE is set Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-12 19:12 ` Catalin Marinas
2023-06-12 19:12 ` Catalin Marinas
2023-06-12 19:20 ` Oliver Upton
2023-06-12 19:20 ` Oliver Upton
2023-06-09 16:21 ` [PATCH v3 06/17] arm64: Allow EL1 physical timer access when running VHE Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-12 19:14 ` Catalin Marinas
2023-06-12 19:14 ` Catalin Marinas
2023-06-09 16:21 ` [PATCH v3 07/17] arm64: Use CPACR_EL1 format to set CPTR_EL2 when E2H is set Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-12 19:15 ` Catalin Marinas
2023-06-12 19:15 ` Catalin Marinas
2023-06-09 16:21 ` [PATCH v3 08/17] KVM: arm64: Remove alternatives from sysreg accessors in VHE hypervisor context Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-09 16:21 ` [PATCH v3 09/17] KVM: arm64: Key use of VHE instructions in nVHE code off ARM64_KVM_HVHE Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-13 9:57 ` Shaoqin Huang
2023-06-13 9:57 ` Shaoqin Huang
2023-06-09 16:21 ` [PATCH v3 10/17] KVM: arm64: Force HCR_EL2.E2H when ARM64_KVM_HVHE is set Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-09 16:21 ` [PATCH v3 11/17] KVM: arm64: Disable TTBR1_EL2 when using ARM64_KVM_HVHE Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-09 16:21 ` [PATCH v3 12/17] KVM: arm64: Adjust EL2 stage-1 leaf AP bits when ARM64_KVM_HVHE is set Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-09 16:21 ` [PATCH v3 13/17] KVM: arm64: Rework CPTR_EL2 programming for HVHE configuration Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-09 16:21 ` [PATCH v3 14/17] KVM: arm64: Program the timer traps with VHE layout in hVHE mode Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-09 16:21 ` [PATCH v3 15/17] KVM: arm64: Force HCR_E2H in guest context when ARM64_KVM_HVHE is set Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-09 16:21 ` [PATCH v3 16/17] arm64: Allow arm64_sw.hvhe on command line Marc Zyngier
2023-06-09 16:21 ` Marc Zyngier
2023-06-12 19:16 ` Catalin Marinas
2023-06-12 19:16 ` Catalin Marinas
2023-06-09 16:22 ` [PATCH v3 17/17] KVM: arm64: Terrible timer hack for M1 with hVHE Marc Zyngier
2023-06-09 16:22 ` Marc Zyngier
2023-06-09 16:54 ` [PATCH v3 00/17] KVM: arm64: Allow using VHE in the nVHE hypervisor Marc Zyngier
2023-06-09 16:54 ` Marc Zyngier
2023-06-14 15:31 ` (subset) " Oliver Upton
2023-06-14 15:31 ` Oliver Upton
2023-06-14 16:16 ` Marc Zyngier
2023-06-14 16:16 ` Marc Zyngier
2024-07-10 6:45 ` Tangnianyao
2024-07-10 8:51 ` Marc Zyngier [this message]
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