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From: Peter Xu <peterx@redhat.com>
To: qemu-devel@nongnu.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Keqian Zhu <zhukeqian1@huawei.com>,
	Hyman <huangy81@chinatelecom.cn>,
	"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
Subject: [PATCH v6 06/10] KVM: Simplify dirty log sync in kvm_set_phys_mem
Date: Wed, 24 Mar 2021 14:39:50 -0400	[thread overview]
Message-ID: <20210324183954.345629-7-peterx@redhat.com> (raw)
In-Reply-To: <20210324183954.345629-1-peterx@redhat.com>

kvm_physical_sync_dirty_bitmap() on the whole section is inaccurate, because
the section can be a superset of the memslot that we're working on.  The result
is that if the section covers multiple kvm memslots, we could be doing the
synchronization for multiple times for each kvmslot in the section.

With the two helpers that we just introduced, it's very easy to do it right now
by calling the helpers.

Signed-off-by: Peter Xu <peterx@redhat.com>
 accel/kvm/kvm-all.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 57a43e6a6b2..e8795d04f85 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -1163,7 +1163,8 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml,
                 goto out;
             if (mem->flags & KVM_MEM_LOG_DIRTY_PAGES) {
-                kvm_physical_sync_dirty_bitmap(kml, section);
+                kvm_slot_get_dirty_log(kvm_state, mem);
+                kvm_slot_sync_dirty_pages(mem);
             /* unregister the slot */

  parent reply	other threads:[~2021-03-24 18:51 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-24 18:39 [PATCH v6 00/10] KVM: Dirty ring support (QEMU part) Peter Xu
2021-03-24 18:39 ` [PATCH v6 01/10] memory: Introduce log_sync_global() to memory listener Peter Xu
2021-03-24 18:39 ` [PATCH v6 02/10] KVM: Use a big lock to replace per-kml slots_lock Peter Xu
2021-03-24 18:39 ` [PATCH v6 03/10] KVM: Create the KVMSlot dirty bitmap on flag changes Peter Xu
2021-03-24 18:39 ` [PATCH v6 04/10] KVM: Provide helper to get kvm dirty log Peter Xu
2021-03-24 18:39 ` [PATCH v6 05/10] KVM: Provide helper to sync dirty bitmap from slot to ramblock Peter Xu
2021-03-24 18:39 ` Peter Xu [this message]
2021-03-24 18:39 ` [PATCH v6 07/10] KVM: Cache kvm slot dirty bitmap size Peter Xu
2021-03-24 18:39 ` [PATCH v6 08/10] KVM: Add dirty-gfn-count property Peter Xu
2021-03-24 18:39 ` [PATCH v6 09/10] KVM: Disable manual dirty log when dirty ring enabled Peter Xu
2021-03-24 18:41 ` [PATCH v6 10/10] KVM: Dirty ring support Peter Xu
2021-04-29 21:07 ` [PATCH v6 00/10] KVM: Dirty ring support (QEMU part) Peter Xu

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