From: sashiko-bot@kernel.org
To: "Carlos López" <clopez@suse.de>
Cc: linux-s390@vger.kernel.org, "Heiko Carstens" <hca@linux.ibm.com>,
"Vasily Gorbik" <gor@linux.ibm.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>
Subject: Re: [PATCH v3 9/9] KVM: s390: don't unmap the gmap on permission upgrade
Date: Fri, 13 Nov 2026 14:26:00 +0000 [thread overview]
Message-ID: <sashiko-outbox-212984@kernel.org> (raw)
In-Reply-To: <20261112142039.907090-11-clopez@suse.de>
> When an mmu_notifier invalidation only upgrades permissions
> (MMU_NOTIFIER_RANGE_PERM_UPGRADE), keep the existing gmap entries
> instead of unmapping them. The PFN is unchanged and no access is
> revoked, so an existing entry is no more permissive than the new host
> PTE.
>
> A write to an entry that is still read-only causes a protection
> exception, which kvm_s390_faultin_gfn() handles as a write fault. This
> applies to both s390 and arm64 guests.
>
> Signed-off-by: Carlos López <clopez@suse.de>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261112142039.907090-2-clopez@suse.de?part=9
next prev parent reply other threads:[~2026-11-13 14:26 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-12 14:20 [PATCH v3 0/9] KVM: don't zap secondary MMU on permission upgrade Carlos López
2026-11-12 14:20 ` [PATCH v3 1/9] mm: fix eager write-bit restore for write-notified shared mappings Carlos López
2026-11-13 14:25 ` sashiko-bot
2026-11-13 20:47 ` Lorenzo Stoakes (ARM)
2026-11-12 14:20 ` [PATCH v3 2/9] riscv: mm: add pud_soft_dirty() Carlos López
2026-11-13 14:25 ` sashiko-bot
2026-11-12 14:20 ` [PATCH v3 3/9] mm/huge_memory: honor MM_CP_TRY_CHANGE_WRITABLE in change_huge_pud() Carlos López
2026-11-13 14:25 ` sashiko-bot
2026-11-13 18:58 ` David Hildenbrand (Arm)
2026-11-13 20:48 ` Lorenzo Stoakes (ARM)
2026-11-12 14:20 ` [PATCH v3 4/9] mm: keep writable entries writable on protection changes Carlos López
2026-11-13 14:25 ` sashiko-bot
2026-11-13 18:56 ` David Hildenbrand (Arm)
2026-11-12 14:20 ` [PATCH v3 5/9] mm/mprotect: add MM_CP_PERM_UPGRADE Carlos López
2026-11-13 14:25 ` sashiko-bot
2026-11-13 18:51 ` David Hildenbrand (Arm)
2026-11-13 20:37 ` Lorenzo Stoakes (ARM)
2026-11-12 14:20 ` [PATCH v3 6/9] mm/mmu_notifier: add MMU_NOTIFIER_RANGE_PERM_UPGRADE Carlos López
2026-11-13 14:25 ` sashiko-bot
2026-11-12 14:20 ` [PATCH v3 7/9] KVM: pass the mmu_notifier event and flags to kvm_gfn_range Carlos López
2026-11-13 14:25 ` sashiko-bot
2026-11-12 14:20 ` [PATCH v3 8/9] KVM: x86/mmu: don't zap secondary MMU on permission upgrade Carlos López
2026-11-13 14:25 ` sashiko-bot
2026-11-12 14:20 ` [PATCH v3 9/9] KVM: s390: don't unmap the gmap " Carlos López
2026-11-13 14:26 ` sashiko-bot [this message]
2026-11-13 19:00 ` [PATCH v3 0/9] KVM: don't zap secondary MMU " David Hildenbrand (Arm)
2026-11-13 20:32 ` Lorenzo Stoakes (ARM)
2026-11-13 20:59 ` Lorenzo Stoakes (ARM)
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