similar to: [PULL] vhost: cleanups and fixes

DMA support in FW CFG had to be pushed out as it caused ltp failures - likely a compatibility issue, and could be a hypervisor bug, but we need to figure it out first. There's still a small chance it'll happen shortly, then I might do another pull request just for that. The following changes since commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4: Linux 4.14 (2017-11-12 10:46:13 -0800)

DMA support in FW CFG had to be pushed out as it caused ltp failures - likely a compatibility issue, and could be a hypervisor bug, but we need to figure it out first. There's still a small chance it'll happen shortly, then I might do another pull request just for that. The following changes since commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4: Linux 4.14 (2017-11-12 10:46:13 -0800)

The following changes since commit 0c8efd610b58cb23cefdfa12015799079aef94ae: Linux 4.16-rc5 (2018-03-11 17:25:09 -0700) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git tags/for_linus for you to fetch changes up to dc32bb678e103afbcfa4d814489af0566307f528: vhost: add vsock compat ioctl (2018-03-20 03:17:42 +0200)

The following changes since commit d9e427f6ab8142d6868eb719e6a7851aafea56b6: virtio_balloon: fix increment of vb->num_pfns in fill_balloon() (2017-12-01 16:55:45 +0200) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git tags/for_linus for you to fetch changes up to 03e9f8a05bce7330bcd9c5cc54c8e42d0fcbf993: virtio_net: fix return value

The following changes since commit d9e427f6ab8142d6868eb719e6a7851aafea56b6: virtio_balloon: fix increment of vb->num_pfns in fill_balloon() (2017-12-01 16:55:45 +0200) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git tags/for_linus for you to fetch changes up to 03e9f8a05bce7330bcd9c5cc54c8e42d0fcbf993: virtio_net: fix return value

On Thu, Feb 15, 2018 at 10:46:50AM +0100, Marc-Andre Lureau wrote: > Hi > > On Wed, Feb 14, 2018 at 9:27 PM, kbuild test robot > <fengguang.wu at intel.com> wrote: > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost > > head: 5d457fe6aeaab9d0a1665eafc8af7139bc6b6f2e > > commit: 5d457fe6aeaab9d0a1665eafc8af7139bc6b6f2e [24/24]

commit c7cdff0e8647 ("virtio_balloon: fix deadlock on OOM") changed code to increment vb->num_pfns before call to set_page_pfns(), which used to happen only after. This patch fixes boot hang for me on ppc64le KVM guests. Fixes: c7cdff0e8647 ("virtio_balloon: fix deadlock on OOM") Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Tetsuo Handa <penguin-kernel at

commit c7cdff0e8647 ("virtio_balloon: fix deadlock on OOM") changed code to increment vb->num_pfns before call to set_page_pfns(), which used to happen only after. This patch fixes boot hang for me on ppc64le KVM guests. Fixes: c7cdff0e8647 ("virtio_balloon: fix deadlock on OOM") Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Tetsuo Handa <penguin-kernel at

tree: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost head: 20b12f92d80433b9bd0d54b9712897501ac66fdd commit: f59055103f6930c771fc597c42a92cbe997a765d [22/28] fw_cfg: add a public uapi header config: i386-randconfig-i0-201806 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: git checkout f59055103f6930c771fc597c42a92cbe997a765d # save

tree: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost head: 3d22d7c1190db3209b644b8a13a75a9802b4587f commit: b3a8771f409b74c42deee28aee3092fc5d2c8dab [22/23] fw_cfg: write vmcoreinfo details reproduce: # apt-get install sparse git checkout b3a8771f409b74c42deee28aee3092fc5d2c8dab make ARCH=x86_64 allmodconfig make C=1 CF=-D__CHECK_ENDIAN__

The following changes since commit d8a5b80568a9cb66810e75b182018e9edb68e8ff: Linux 4.15 (2018-01-28 13:20:33 -0800) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git tags/for_linus for you to fetch changes up to d25cc43c6775bff6b8e3dad97c747954b805e421: vhost: don't hold onto file pointer for VHOST_SET_LOG_FD (2018-02-01 16:26:47

tree: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost head: 5d457fe6aeaab9d0a1665eafc8af7139bc6b6f2e commit: 5d457fe6aeaab9d0a1665eafc8af7139bc6b6f2e [24/24] fw_cfg: fix sparse warnings around FW_CFG_FILE_DIR read config: i386-randconfig-x015-201806 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: git checkout

tree: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost head: 9991b95cb712cdd9a40240bde6274d5415476fb5 commit: 860c7fa9d6d433011e82a4f7f896893e914ce4a9 [11/22] fw_cfg: write vmcoreinfo details config: i386-randconfig-a0-201804 (attached as .config) compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4 reproduce: git checkout 860c7fa9d6d433011e82a4f7f896893e914ce4a9 # save

tree: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost head: 9991b95cb712cdd9a40240bde6274d5415476fb5 commit: 860c7fa9d6d433011e82a4f7f896893e914ce4a9 [11/22] fw_cfg: write vmcoreinfo details config: i386-randconfig-c0-02011330 (attached as .config) compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025 reproduce: git checkout 860c7fa9d6d433011e82a4f7f896893e914ce4a9

The balloon_lock was used to synchronize the access demand to elements of struct virtio_balloon and its queue operations (please see commit e22504296d). This prevents the concurrent run of the leak_balloon and fill_balloon functions, thereby resulting in a deadlock issue on OOM: fill_balloon: take balloon_lock and wait for OOM to get some memory; oom_notify: release some inflated memory via

On 10/22/2017 01:20 PM, Tetsuo Handa wrote: > Wei Wang wrote: >> The balloon_lock was used to synchronize the access demand to elements >> of struct virtio_balloon and its queue operations (please see commit >> e22504296d). This prevents the concurrent run of the leak_balloon and >> fill_balloon functions, thereby resulting in a deadlock issue on OOM: >> >>

On Fri, Dec 01, 2017 at 11:31:08PM +1100, Michael Ellerman wrote: > "Michael S. Tsirkin" <mst at redhat.com> writes: > > > fill_balloon doing memory allocations under balloon_lock > > can cause a deadlock when leak_balloon is called from > > virtballoon_oom_notify and tries to take same lock. > > > > To fix, split page allocation and enqueue and

On Fri, Dec 01, 2017 at 11:31:08PM +1100, Michael Ellerman wrote: > "Michael S. Tsirkin" <mst at redhat.com> writes: > > > fill_balloon doing memory allocations under balloon_lock > > can cause a deadlock when leak_balloon is called from > > virtballoon_oom_notify and tries to take same lock. > > > > To fix, split page allocation and enqueue and

Wei Wang wrote: > The balloon_lock was used to synchronize the access demand to elements > of struct virtio_balloon and its queue operations (please see commit > e22504296d). This prevents the concurrent run of the leak_balloon and > fill_balloon functions, thereby resulting in a deadlock issue on OOM: > > fill_balloon: take balloon_lock and wait for OOM to get some memory; >

Wei Wang wrote: > The balloon_lock was used to synchronize the access demand to elements > of struct virtio_balloon and its queue operations (please see commit > e22504296d). This prevents the concurrent run of the leak_balloon and > fill_balloon functions, thereby resulting in a deadlock issue on OOM: > > fill_balloon: take balloon_lock and wait for OOM to get some memory; >