On Tue, 22 Sept 2026 at 15:19, Lorenzo Stoakes (ARM) <[email protected]> wrote: > > From: Jack Thomson <[email protected]> > > 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 <[email protected]> > [ljs: fixup new kvm_pgtable_get_leaf() invocation] > Signed-off-by: Lorenzo Stoakes (ARM) <[email protected]>
Reviewed-by: Fuad Tabba <[email protected]> Cheers, /fuad
