Thread (133 messages) 133 messages, 11 authors, 2024-08-22

Re: [PATCH v12 54/84] KVM: arm64: Mark "struct page" pfns accessed/dirty before dropping mmu_lock

From: Marc Zyngier <maz@kernel.org>
Date: 2024-08-06 08:55:25
Also in: kvm, kvm-riscv, kvmarm, linux-arm-kernel, linux-riscv, linuxppc-dev, lkml, loongarch

On Tue, 06 Aug 2024 00:26:54 +0100,
Oliver Upton [off-list ref] wrote:
On Mon, Aug 05, 2024 at 11:26:03PM +0000, Oliver Upton wrote:
quoted
[+cc Fuad]
Take 2!
quoted
Fuad, you mentioned in commit 9c30fc615daa ("KVM: arm64: Move setting
the page as dirty out of the critical section") that restructuring
around the MMU lock was helpful for reuse (presumably for pKVM), but I
lack the context there.

On Fri, Jul 26, 2024 at 04:52:03PM -0700, Sean Christopherson wrote:
quoted
Mark pages/folios accessed+dirty prior to dropping mmu_lock, as marking a
page/folio dirty after it has been written back can make some filesystems
unhappy (backing KVM guests will such filesystem files is uncommon, and
typo: s/will/with/
quoted
the race is minuscule, hence the lack of complaints).  See the link below
for details.
Should we consider reverting 9c30fc615daa then?

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.
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