qemu-kvm/kvm-vhost-Delete-useless-read-memory-barrier.patch
Miroslav Rezanina 19bc18cc9e * Thu Sep 29 2022 Miroslav Rezanina <mrezanin@redhat.com> - 7.1.0-2
- kvm-vdpa-Skip-the-maps-not-in-the-iova-tree.patch [RHELX-57]
- kvm-vdpa-do-not-save-failed-dma-maps-in-SVQ-iova-tree.patch [RHELX-57]
- kvm-util-accept-iova_tree_remove_parameter-by-value.patch [RHELX-57]
- kvm-vdpa-Remove-SVQ-vring-from-iova_tree-at-shutdown.patch [RHELX-57]
- kvm-vdpa-Make-SVQ-vring-unmapping-return-void.patch [RHELX-57]
- kvm-vhost-Always-store-new-kick-fd-on-vhost_svq_set_svq_.patch [RHELX-57]
- kvm-vdpa-Use-ring-hwaddr-at-vhost_vdpa_svq_unmap_ring.patch [RHELX-57]
- kvm-vhost-stop-transfer-elem-ownership-in-vhost_handle_g.patch [RHELX-57]
- kvm-vhost-use-SVQ-element-ndescs-instead-of-opaque-data-.patch [RHELX-57]
- kvm-vhost-Delete-useless-read-memory-barrier.patch [RHELX-57]
- kvm-vhost-Do-not-depend-on-NULL-VirtQueueElement-on-vhos.patch [RHELX-57]
- kvm-vhost_net-Add-NetClientInfo-start-callback.patch [RHELX-57]
- kvm-vhost_net-Add-NetClientInfo-stop-callback.patch [RHELX-57]
- kvm-vdpa-add-net_vhost_vdpa_cvq_info-NetClientInfo.patch [RHELX-57]
- kvm-vdpa-Move-command-buffers-map-to-start-of-net-device.patch [RHELX-57]
- kvm-vdpa-extract-vhost_vdpa_net_cvq_add-from-vhost_vdpa_.patch [RHELX-57]
- kvm-vhost_net-add-NetClientState-load-callback.patch [RHELX-57]
- kvm-vdpa-Add-virtio-net-mac-address-via-CVQ-at-start.patch [RHELX-57]
- kvm-vdpa-Delete-CVQ-migration-blocker.patch [RHELX-57]
- kvm-vdpa-Make-VhostVDPAState-cvq_cmd_in_buffer-control-a.patch [RHELX-57]
- kvm-vdpa-extract-vhost_vdpa_net_load_mac-from-vhost_vdpa.patch [RHELX-57]
- kvm-vdpa-Add-vhost_vdpa_net_load_mq.patch [RHELX-57]
- kvm-vdpa-validate-MQ-CVQ-commands.patch [RHELX-57]
- kvm-virtio-net-Update-virtio-net-curr_queue_pairs-in-vdp.patch [RHELX-57]
- kvm-vdpa-Allow-MQ-feature-in-SVQ.patch [RHELX-57]
- kvm-i386-reset-KVM-nested-state-upon-CPU-reset.patch [bz#2125281]
- kvm-i386-do-kvm_put_msr_feature_control-first-thing-when.patch [bz#2125281]
- kvm-Revert-Re-enable-capstone-internal-build.patch [bz#2127825]
- kvm-spec-Use-capstone-package.patch [bz#2127825]
- Resolves: RHELX-57
  (vDPA SVQ Multiqueue support )
- Resolves: bz#2125281
  ([RHEL9.1] Guests in VMX root operation fail to reboot with QEMU's 'system_reset' command [rhel-9.2.0])
- Resolves: bz#2127825
  (Use capstone for qemu-kvm build)
2022-09-29 03:59:55 -04:00

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1.7 KiB
Diff

From 878a37760e34b54a3d92569f44b0b2f073bfa46a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Tue, 23 Aug 2022 20:30:28 +0200
Subject: [PATCH 10/29] vhost: Delete useless read memory barrier
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Laurent Vivier <lvivier@redhat.com>
RH-MergeRequest: 117: vDPA SVQ Multiqueue support
RH-Jira: RHELX-57
RH-Acked-by: Jason Wang <jasowang@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Acked-by: Eugenio Pérez <eperezma@redhat.com>
RH-Commit: [10/25] 13fb2b317093323caf33a17f9de00a94a862ca2e (redhat/centos-stream/src/qemu-kvm)
As discussed in previous series [1], this memory barrier is useless with
the atomic read of used idx at vhost_svq_more_used. Deleting it.
[1] https://lists.nongnu.org/archive/html/qemu-devel/2022-07/msg02616.html
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
(cherry picked from commit 9e193cec5db949e4001070442a2f7de7042ef09b)
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
hw/virtio/vhost-shadow-virtqueue.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c
index b35aeef4bd..8df5296f24 100644
--- a/hw/virtio/vhost-shadow-virtqueue.c
+++ b/hw/virtio/vhost-shadow-virtqueue.c
@@ -509,9 +509,6 @@ size_t vhost_svq_poll(VhostShadowVirtqueue *svq)
if (unlikely(g_get_monotonic_time() - start_us > 10e6)) {
return 0;
}
-
- /* Make sure we read new used_idx */
- smp_rmb();
} while (true);
}
--
2.31.1