Re: Re: [PATCH v6 03/10] vhost-vdpa: protect concurrent access to vhost device iotlb
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2021-04-11 20:49:03
Also in:
kvm, linux-fsdevel, netdev
On Sun, Apr 11, 2021 at 01:36:18PM +0800, Yongji Xie wrote:
On Sat, Apr 10, 2021 at 12:16 AM Michael S. Tsirkin [off-list ref] wrote:quoted
On Wed, Mar 31, 2021 at 04:05:12PM +0800, Xie Yongji wrote:quoted
Use vhost_dev->mutex to protect vhost device iotlb from concurrent access. Fixes: 4c8cf318("vhost: introduce vDPA-based backend") Cc: stable@vger.kernel.org Signed-off-by: Xie Yongji <redacted> Acked-by: Jason Wang <redacted> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>I could not figure out whether there's a bug there now. If yes when is the concurrent access triggered?When userspace sends the VHOST_IOTLB_MSG_V2 message concurrently? vhost_vdpa_chr_write_iter -> vhost_chr_write_iter -> vhost_vdpa_process_iotlb_msg() Thanks, Yongji
And then what happens currently? -- MST _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization