KVM: arm64: Pass walk flags to kvm_pgtable_get_leaf()

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 <jackabt@amazon.com>
[ljs: fixup new kvm_pgtable_get_leaf() invocation]
Reviewed-by: Oliver Upton <oupton@kernel.org>
Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev>
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Tested-by: Fuad Tabba <fuad.tabba@linux.dev>
Link: https://patch.msgid.link/20260923-kvm-arm-prefault-v4-9-d4b0b4dfa8c3@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

0 files changed, 0 insertions, 0 deletions