similar to: [PATCH v3 05/38] virtio_balloon: correct tags for config space fields

Tag config space fields as having little endian-ness. Note that balloon is special: LE even when using the legacy interface. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- include/uapi/linux/virtio_balloon.h | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h index

From: Alexander Duyck <alexander.h.duyck at linux.intel.com> It can be confusing to have multiple features within the same driver that are using the same verbage. As such this patch is creating a union of free_page_report_cmd_id with free_page_hint_cmd_id so that we can clean-up the userspace code a bit in terms of readability while maintaining the functionality of legacy code.

From: Alexander Duyck <alexander.h.duyck at linux.intel.com> It can be confusing to have multiple features within the same driver that are using the same verbage. As such this patch is creating a union of free_page_report_cmd_id with free_page_hint_cmd_id so that we can clean-up the userspace code a bit in terms of readability while maintaining the functionality of legacy code.

On 15.04.20 19:44, Alexander Duyck wrote: > From: Alexander Duyck <alexander.h.duyck at linux.intel.com> > > It can be confusing to have multiple features within the same driver that > are using the same verbage. As such this patch is creating a union of > free_page_report_cmd_id with free_page_hint_cmd_id so that we can clean-up > the userspace code a bit in terms of

From: Alexander Duyck <alexander.h.duyck at linux.intel.com> It can be confusing to have multiple features within the same driver that are using the same verbage. As such this patch is creating a union of free_page_report_cmd_id with free_page_hint_cmd_id so that we can clean-up the userspace code a bit in terms of readability while maintaining the functionality of legacy code.

Balloon is LE, it's cleaner to access it as such directly. Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- drivers/virtio/virtio_balloon.c | 26 +++++++++----------------- 1 file changed, 9 insertions(+), 17 deletions(-) diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 8bc1704ffdf3..31cc97f2f515 100644 --- a/drivers/virtio/virtio_balloon.c

The guest free pages should not be discarded by the live migration thread when page poisoning is enabled with PAGE_POISONING_NO_SANITY=n, because skipping the transfer of such poisoned free pages will trigger false positive when new pages are allocated and checked on the destination. This patch adds a config field, poison_val. Guest writes to the config field to tell the host about the poisoning

On Wed, Feb 07, 2018 at 11:01:06AM +0800, Wei Wang wrote: > Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the > support of reporting hints of guest free pages to host via virtio-balloon. > > Host requests the guest to report free page hints by sending a new cmd > id to the guest via the free_page_report_cmd_id configuration register. > > When the guest

The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value in use. Signed-off-by: Wei Wang <wei.w.wang at intel.com> Suggested-by: Michael S. Tsirkin <mst at redhat.com> Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Michal Hocko <mhocko at

On 12.05.20 11:41, Hui Zhu wrote: This description needs an overhaul, it's hard to parse. > If the guest kernel has many fragmentation pages, use virtio_balloon > will split THP of QEMU when it calls MADV_DONTNEED madvise to release > the balloon pages. This is very unclear and confusing. You will *always* split THPs when inflating 4k pages and there are THPs around. This is

On Sun, Jul 12, 2020 at 8:10 AM Michael S. Tsirkin <mst at redhat.com> wrote: > > On Fri, Jul 10, 2020 at 09:13:41AM -0700, Alexander Duyck wrote: > > On Fri, Jul 10, 2020 at 4:31 AM Michael S. Tsirkin <mst at redhat.com> wrote: > > > > > > Page reporting features were never supported by legacy hypervisors. > > > Supporting them poses a problem:

Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_VQ feature indicates the support of reporting hints of guest free pages to host via virtio-balloon. Host requests the guest to report free pages by sending a new cmd id to the guest via the free_page_report_cmd_id configuration register. When the guest starts to report, the first element added to the free page vq is the cmd id given by host. When the

Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the support of reporting hints of guest free pages to host via virtio-balloon. Host requests the guest to report free pages by sending a new cmd id to the guest via the free_page_report_cmd_id configuration register. When the guest starts to report, the first element added to the free page vq is the cmd id given by host. When

Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the support of reporting hints of guest free pages to host via virtio-balloon. Host requests the guest to report free pages by sending a new cmd id to the guest via the free_page_report_cmd_id configuration register. When the guest starts to report, the first element added to the free page vq is the cmd id given by host. When

On Wed, Jan 24, 2018 at 10:50:27AM +0800, Wei Wang wrote: > Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_VQ feature indicates the > support of reporting hints of guest free pages to host via virtio-balloon. > > Host requests the guest to report free pages by sending a new cmd > id to the guest via the free_page_report_cmd_id configuration register. > > When the guest starts

On Wed, Jan 24, 2018 at 10:50:27AM +0800, Wei Wang wrote: > Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_VQ feature indicates the > support of reporting hints of guest free pages to host via virtio-balloon. > > Host requests the guest to report free pages by sending a new cmd > id to the guest via the free_page_report_cmd_id configuration register. > > When the guest starts

Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the support of reporting hints of guest free pages to host via virtio-balloon. Host requests the guest to report free page hints by sending a new cmd id to the guest via the free_page_report_cmd_id configuration register. When the guest starts to report, the first element added to the free page vq is the cmd id given by host.

Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the support of reporting hints of guest free pages to host via virtio-balloon. Host requests the guest to report free page hints by sending a new cmd id to the guest via the free_page_report_cmd_id configuration register. When the guest starts to report, the first element added to the free page vq is the cmd id given by host.

On Fri, Jul 10, 2020 at 09:13:41AM -0700, Alexander Duyck wrote: > On Fri, Jul 10, 2020 at 4:31 AM Michael S. Tsirkin <mst at redhat.com> wrote: > > > > Page reporting features were never supported by legacy hypervisors. > > Supporting them poses a problem: should we use native endian-ness (like > > current code assumes)? Or little endian-ness like the virtio spec

On Fri, Jul 10, 2020 at 09:13:41AM -0700, Alexander Duyck wrote: > On Fri, Jul 10, 2020 at 4:31 AM Michael S. Tsirkin <mst at redhat.com> wrote: > > > > Page reporting features were never supported by legacy hypervisors. > > Supporting them poses a problem: should we use native endian-ness (like > > current code assumes)? Or little endian-ness like the virtio spec