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Message-ID: <877cqdqw12.wl-maz@kernel.org>
Date: Wed, 02 Aug 2023 16:55:05 +0100
From: Marc Zyngier <maz@...nel.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Raghavendra Rao Ananta <rananta@...gle.com>,
Oliver Upton <oliver.upton@...ux.dev>,
James Morse <james.morse@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Paolo Bonzini <pbonzini@...hat.com>,
Huacai Chen <chenhuacai@...nel.org>,
Zenghui Yu <yuzenghui@...wei.com>,
Anup Patel <anup@...infault.org>,
Atish Patra <atishp@...shpatra.org>,
Jing Zhang <jingzhangos@...gle.com>,
Reiji Watanabe <reijiw@...gle.com>,
Colton Lewis <coltonlewis@...gle.com>,
David Matlack <dmatlack@...gle.com>,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
linux-mips@...r.kernel.org, kvm-riscv@...ts.infradead.org,
linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org
Subject: Re: [PATCH v7 02/12] KVM: arm64: Use kvm_arch_flush_remote_tlbs()
On Mon, 31 Jul 2023 22:50:07 +0100,
Sean Christopherson <seanjc@...gle.com> wrote:
>
> On Thu, Jul 27, 2023, Marc Zyngier wrote:
> > On Sat, 22 Jul 2023 03:22:41 +0100,
> > Raghavendra Rao Ananta <rananta@...gle.com> wrote:
> > >
> > > Stop depending on CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL and opt to
> > > standardize on kvm_arch_flush_remote_tlbs() since it avoids
> > > duplicating the generic TLB stats across architectures that implement
> > > their own remote TLB flush.
> > >
> > > This adds an extra function call to the ARM64 kvm_flush_remote_tlbs()
> > > path, but that is a small cost in comparison to flushing remote TLBs.
> >
> > Well, there is no such thing as a "remote TLB" anyway. We either have
> > a non-shareable or inner-shareable invalidation. The notion of remote
> > would imply that we track who potentially has a TLB, which we
> > obviously don't.
>
> Maybe kvm_arch_flush_vm_tlbs()? The "remote" part is misleading even on x86 when
> running on Hyper-V, as the flush may be done via a single hypercall and by kicking
> "remote" vCPUs.
Yup, this would be much better.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
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