similar to: [PATCH RFC] vhost: add ioctl to query nregions upper limit

On Wed, Jun 24, 2015 at 04:07:27PM +0200, Igor Mammedov wrote: > On Wed, 24 Jun 2015 15:49:27 +0200 > "Michael S. Tsirkin" <mst at redhat.com> wrote: > > > Userspace currently simply tries to give vhost as many regions > > as it happens to have, but you only have the mem table > > when you have initialized a large part of VM, so graceful > >

On Wed, Jun 24, 2015 at 04:07:27PM +0200, Igor Mammedov wrote: > On Wed, 24 Jun 2015 15:49:27 +0200 > "Michael S. Tsirkin" <mst at redhat.com> wrote: > > > Userspace currently simply tries to give vhost as many regions > > as it happens to have, but you only have the mem table > > when you have initialized a large part of VM, so graceful > >

On Wed, Jun 24, 2015 at 04:52:29PM +0200, Igor Mammedov wrote: > On Wed, 24 Jun 2015 16:17:46 +0200 > "Michael S. Tsirkin" <mst at redhat.com> wrote: > > > On Wed, Jun 24, 2015 at 04:07:27PM +0200, Igor Mammedov wrote: > > > On Wed, 24 Jun 2015 15:49:27 +0200 > > > "Michael S. Tsirkin" <mst at redhat.com> wrote: > > > >

On Wed, Jun 24, 2015 at 04:52:29PM +0200, Igor Mammedov wrote: > On Wed, 24 Jun 2015 16:17:46 +0200 > "Michael S. Tsirkin" <mst at redhat.com> wrote: > > > On Wed, Jun 24, 2015 at 04:07:27PM +0200, Igor Mammedov wrote: > > > On Wed, 24 Jun 2015 15:49:27 +0200 > > > "Michael S. Tsirkin" <mst at redhat.com> wrote: > > > >

On Wed, 24 Jun 2015 15:49:27 +0200 "Michael S. Tsirkin" <mst at redhat.com> wrote: > Userspace currently simply tries to give vhost as many regions > as it happens to have, but you only have the mem table > when you have initialized a large part of VM, so graceful > failure is very hard to support. > > The result is that userspace tends to fail catastrophically.

On Wed, 24 Jun 2015 16:17:46 +0200 "Michael S. Tsirkin" <mst at redhat.com> wrote: > On Wed, Jun 24, 2015 at 04:07:27PM +0200, Igor Mammedov wrote: > > On Wed, 24 Jun 2015 15:49:27 +0200 > > "Michael S. Tsirkin" <mst at redhat.com> wrote: > > > > > Userspace currently simply tries to give vhost as many regions > > > as it

What it is: vhost net is a character device that can be used to reduce the number of system calls involved in virtio networking. Existing virtio net code is used in the guest without modification. There's similarity with vringfd, with some differences and reduced scope - uses eventfd for signalling - structures can be moved around in memory at any time (good for migration) - support memory

What it is: vhost net is a character device that can be used to reduce the number of system calls involved in virtio networking. Existing virtio net code is used in the guest without modification. There's similarity with vringfd, with some differences and reduced scope - uses eventfd for signalling - structures can be moved around in memory at any time (good for migration) - support memory

What it is: vhost net is a character device that can be used to reduce the number of system calls involved in virtio networking. Existing virtio net code is used in the guest without modification. There's similarity with vringfd, with some differences and reduced scope - uses eventfd for signalling - structures can be moved around in memory at any time (good for migration) - support memory

What it is: vhost net is a character device that can be used to reduce the number of system calls involved in virtio networking. Existing virtio net code is used in the guest without modification. There's similarity with vringfd, with some differences and reduced scope - uses eventfd for signalling - structures can be moved around in memory at any time (good for migration) - support memory

What it is: vhost net is a character device that can be used to reduce the number of system calls involved in virtio networking. Existing virtio net code is used in the guest without modification. There's similarity with vringfd, with some differences and reduced scope - uses eventfd for signalling - structures can be moved around in memory at any time (good for migration) - support memory

What it is: vhost net is a character device that can be used to reduce the number of system calls involved in virtio networking. Existing virtio net code is used in the guest without modification. There's similarity with vringfd, with some differences and reduced scope - uses eventfd for signalling - structures can be moved around in memory at any time (good for migration) - support memory

This patch tries to implement an device IOTLB for vhost. This could be used with for co-operation with userspace(qemu) implementation of iommu for a secure DMA environment (DMAR) in guest. The idea is simple. When vhost meets an IOTLB miss, it will request the assistance of userspace to do the translation, this is done through: - Fill the translation request in a preset userspace address (This

This patch tries to implement an device IOTLB for vhost. This could be used with for co-operation with userspace(qemu) implementation of iommu for a secure DMA environment (DMAR) in guest. The idea is simple. When vhost meets an IOTLB miss, it will request the assistance of userspace to do the translation, this is done through: - Fill the translation request in a preset userspace address (This

The _IOC_READ flag fits this ioctl request more because this request actually only writes to, but doesn't read from userspace. See NOTEs in include/uapi/asm-generic/ioctl.h for more information. Fixes: 429711aec282 ("vhost: switch to use new message format") Signed-off-by: Gleb Fotengauer-Malinovskiy <glebfm at altlinux.org> --- include/uapi/linux/vhost.h | 2 +- 1 file

The _IOC_READ flag fits this ioctl request more because this request actually only writes to, but doesn't read from userspace. See NOTEs in include/uapi/asm-generic/ioctl.h for more information. Fixes: 429711aec282 ("vhost: switch to use new message format") Signed-off-by: Gleb Fotengauer-Malinovskiy <glebfm at altlinux.org> --- include/uapi/linux/vhost.h | 2 +- 1 file

This patch tries to implement an device IOTLB for vhost. This could be used with for co-operation with userspace(qemu) implementation of iommu for a secure DMA environment in guest. The idea is simple. When vhost meets an IOTLB miss, it will request the assistance of userspace to do the translation, this is done through: - Fill the translation request in a preset userspace address (This

This patch tries to implement an device IOTLB for vhost. This could be used with for co-operation with userspace(qemu) implementation of iommu for a secure DMA environment in guest. The idea is simple. When vhost meets an IOTLB miss, it will request the assistance of userspace to do the translation, this is done through: - Fill the translation request in a preset userspace address (This

On 2018?09?04? 10:22, Michael S. Tsirkin wrote: > On Mon, Sep 03, 2018 at 08:59:13PM +0300, Gleb Fotengauer-Malinovskiy wrote: >> The _IOC_READ flag fits this ioctl request more because this request >> actually only writes to, but doesn't read from userspace. >> See NOTEs in include/uapi/asm-generic/ioctl.h for more information. >> >> Fixes: 429711aec282

On 2018?09?04? 10:22, Michael S. Tsirkin wrote: > On Mon, Sep 03, 2018 at 08:59:13PM +0300, Gleb Fotengauer-Malinovskiy wrote: >> The _IOC_READ flag fits this ioctl request more because this request >> actually only writes to, but doesn't read from userspace. >> See NOTEs in include/uapi/asm-generic/ioctl.h for more information. >> >> Fixes: 429711aec282