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From: Oliver Upton <oliver.upton@linux.dev>
To: Sean Christopherson <seanjc@google.com>
Cc: Marc Zyngier <maz@kernel.org>,
	linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
	linux-kernel@vger.kernel.org,
	James Houghton <jthoughton@google.com>
Subject: Re: [RFC PATCH 00/16] KVM: arm64: Add "struct kvm_page_fault"
Date: Thu, 21 Aug 2025 15:39:19 -0700	[thread overview]
Message-ID: <aKegF0XyrDF1Z5w4@linux.dev> (raw)
In-Reply-To: <20250821210042.3451147-1-seanjc@google.com>

On Thu, Aug 21, 2025 at 02:00:26PM -0700, Sean Christopherson wrote:
> Add an arm64 version of "struct kvm_page_fault" to (hopefully) tidy up
> the abort path, and to pave the way for things like KVM Userfault[*] that
> want to consume kvm_page_fault in arch-neutral code.
> 
> This is essentially one giant nop of code shuffling.
> 
> RFC as this is only compile-tested.  I didn't want to spend time testing
> until I got feedback on whether or not y'all are amenable to the general idea.

I appreciate the improved scoping around things like mmap lock, so this
seems like a net-win in terms of readability. Just want to clarify the
way this gets consumed from arch-neutral code and actually read in
detail.

Thanks,
Oliver

      parent reply	other threads:[~2025-08-21 22:39 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-08-21 21:00 [RFC PATCH 00/16] KVM: arm64: Add "struct kvm_page_fault" Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 01/16] KVM: arm64: Drop nested "esr" to eliminate variable shadowing Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 02/16] KVM: arm64: Get iabt status on-demand Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 03/16] KVM: arm64: Move SRCU-protected region of kvm_handle_guest_abort() to helper Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 04/16] KVM: arm64: Use guard(srcu) in kvm_handle_guest_abort() Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 05/16] KVM: arm64: Introduce "struct kvm_page_fault" for tracking abort state Sean Christopherson
2025-08-21 22:31   ` Oliver Upton
2025-08-26 18:58     ` Sean Christopherson
2025-08-26 19:29       ` Oliver Upton
2025-08-26 21:29         ` Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 06/16] KVM: arm64: Pass kvm_page_fault pointer to transparent_hugepage_adjust() Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 07/16] KVM: arm64: Pass @fault to fault_supports_stage2_huge_mapping() Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 08/16] KVM: arm64: Add helper to get permission fault granule from ESR Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 09/16] KVM: arm64: Track perm fault granule in "struct kvm_page_fault" Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 10/16] KVM: arm64: Drop local vfio_allow_any_uc, use vm_flags snapshot Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 11/16] KVM: arm64: Drop local mte_allowed, " Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 12/16] KVM: arm64: Move VMA-related information into "struct kvm_page_fault" Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 13/16] KVM: arm64: Stash "mmu_seq" in " Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 14/16] KVM: arm64: Track "forced" information " Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 15/16] KVM: arm64: Extract mmap_lock-protected code to helper for user mem aborts Sean Christopherson
2025-08-21 21:00 ` [RFC PATCH 16/16] KVM: arm64: Don't bother nullifying "vma" in mem abort path Sean Christopherson
2025-08-21 22:39 ` Oliver Upton [this message]

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