Re: [PATCH v3 09/14] KVM: arm64: Pass walk flags to kvm_pgtable_get_leaf()
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From: Fuad Tabba <fuad.tabba@linux.dev>
Date: 2026-09-23 11:08:15
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On Tue, 22 Sept 2026 at 15:19, Lorenzo Stoakes (ARM) [off-list ref] wrote:
From: Jack Thomson <redacted> Allow callers of kvm_pgtable_get_leaf() to specify the page-table walk flags, in preparation for performing walks under the MMU read lock. Reading a stage-2 leaf while only holding the read lock requires KVM_PGTABLE_WALK_SHARED: parallel faults (which also only hold the read lock) can unlink table pages and free them via RCU, so the walker must be inside an RCU read-side critical section, which the shared walk flag provides via kvm_pgtable_walk_begin(). All existing callers either hold the write lock, walk with interrupts disabled, or run at hyp where shared walks are rejected; they keep the current behaviour by passing no flags. No functional change intended. Signed-off-by: Jack Thomson <redacted> [ljs: fixup new kvm_pgtable_get_leaf() invocation] Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev> Cheers, /fuad