Hello Junaid Shahid
Any comments on the patch? I may have been misunderstanding many things and I
have been often.
thanks
Lai
On 2021/10/19 19:01, Lai Jiangshan wrote:
From: Lai Jiangshan <laijs@xxxxxxxxxxxxxxxxx>
The commit 578e1c4db2213 ("kvm: x86: Avoid taking MMU lock in
kvm_mmu_sync_roots if no sync is needed") added smp_wmb() in
mmu_try_to_unsync_pages(), but the corresponding smp_load_acquire()
isn't used on the load of SPTE.W which is impossible since the load of
SPTE.W is performed in the CPU's pagetable walking.
This patch changes to use smp_rmb() instead. This patch fixes nothing
but just comments since smp_rmb() is NOP and compiler barrier() is not
required since the load of SPTE.W is before VMEXIT.
Cc: Junaid Shahid <junaids@xxxxxxxxxx>
Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxxxxx>
