From: Oliver Upton <oliver.upton@linux.dev>
To: Jack Thomson <jackabt.amazon@gmail.com>
Cc: maz@kernel.org, pbonzini@redhat.com, joey.gouly@arm.com,
suzuki.poulose@arm.com, yuzenghui@huawei.com,
catalin.marinas@arm.com, will@kernel.org, shuah@kernel.org,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
isaku.yamahata@intel.com, roypat@amazon.co.uk,
kalyazin@amazon.co.uk, jackabt@amazon.com
Subject: Re: [PATCH 1/6] KVM: arm64: Add __gmem_abort and __user_mem_abort
Date: Thu, 11 Sep 2025 11:27:23 -0700 [thread overview]
Message-ID: <aMMUiyPLd1-_-V5p@linux.dev> (raw)
In-Reply-To: <20250911134648.58945-2-jackabt.amazon@gmail.com>
Hi Jack,
On Thu, Sep 11, 2025 at 02:46:43PM +0100, Jack Thomson wrote:
> From: Jack Thomson <jackabt@amazon.com>
>
> Adding __gmem_abort and __user_mem_abort that preserve -EAGAIN results.
> These will be used by the pre-fault implementation which needs to retry
> on -EAGAIN.
-EAGAIN is a pretty clear signal that another vCPU has faulted on this
memory and is in the middle of installing a mapping. Why bother with
retrying?
If we conceptually treat this thing as a synthetic stage-2 abort then it
should use the same EAGAIN handling as a literal stage-2 abort.
Thanks,
Oliver
next prev parent reply other threads:[~2025-09-11 18:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-11 13:46 [PATCH 0/6] KVM ARM64 pre_fault_memory Jack Thomson
2025-09-11 13:46 ` [PATCH 1/6] KVM: arm64: Add __gmem_abort and __user_mem_abort Jack Thomson
2025-09-11 18:27 ` Oliver Upton [this message]
2025-09-11 13:46 ` [PATCH 2/6] KVM: arm64: Add KVM_PGTABLE_WALK_PRE_FAULT walk flag Jack Thomson
2025-09-11 13:46 ` [PATCH 3/6] KVM: arm64: Add pre_fault_memory implementation Jack Thomson
2025-09-11 18:42 ` Oliver Upton
2025-09-29 13:59 ` Thomson, Jack
2025-09-30 0:53 ` Oliver Upton
2025-09-11 13:46 ` [PATCH 4/6] KVM: selftests: Fix unaligned mmap allocations Jack Thomson
2025-09-11 13:46 ` [PATCH 5/6] KVM: selftests: Enable pre_fault_memory_test for arm64 Jack Thomson
2025-09-11 13:46 ` [PATCH 6/6] KVM: selftests: Add option for different backing in pre-fault tests Jack Thomson
2025-09-11 18:56 ` [PATCH 0/6] KVM ARM64 pre_fault_memory Oliver Upton
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