On 2019/5/10 上午10:59, Jason Wang wrote:
r = get_user_pages_fast(log, 1, 1, );
OK so the trick is that page is pinned so you don't expect
arch_futex_atomic_op_inuser below to fail. get_user_pages_fast
guarantees page is not going away but does it guarantee PTE won't be
invaidated or
On 2019/5/9 下午9:18, Michael S. Tsirkin wrote:
On Thu, May 09, 2019 at 08:58:00AM -0400, Jason Wang wrote:
Vhost log dirty pages directly to a userspace bitmap through GUP and
kmap_atomic() since kernel doesn't have a set_bit_to_user()
helper. This will cause issues for the arch that has
On Wed, 8 May 2019 15:15:40 +0200
Claudio Imbrenda wrote:
> On Fri, 26 Apr 2019 20:32:39 +0200
> Halil Pasic wrote:
>
> > On s390, protected virtualization guests have to use bounced I/O
> > buffers. That requires some plumbing.
> >
> > Let us make sure, any device that uses DMA API with
On Thu, 9 May 2019 12:11:06 +0200
Cornelia Huck wrote:
> On Wed, 8 May 2019 23:22:10 +0200
> Halil Pasic wrote:
>
> > On Wed, 8 May 2019 15:18:10 +0200 (CEST)
> > Sebastian Ott wrote:
>
> > > > @@ -1063,6 +1163,7 @@ static int __init css_bus_init(void)
> > > >
On Thu, 9 May 2019 15:30:08 +0200
Pierre Morel wrote:
> On 08/05/2019 16:46, Pierre Morel wrote:
> > On 26/04/2019 20:32, Halil Pasic wrote:
> >> Before virtio-ccw could get away with not using DMA API for the pieces of
> >> memory it does ccw I/O with. With protected virtualization this has to
On Thu, 9 May 2019 14:01:01 +0200
Pierre Morel wrote:
> On 08/05/2019 16:31, Pierre Morel wrote:
> > On 26/04/2019 20:32, Halil Pasic wrote:
> >> This will come in handy soon when we pull out the indicators from
> >> virtio_ccw_device to a memory area that is shared with the hypervisor
> >> (in
On Thu, May 09, 2019 at 08:58:00AM -0400, Jason Wang wrote:
> Vhost log dirty pages directly to a userspace bitmap through GUP and
> kmap_atomic() since kernel doesn't have a set_bit_to_user()
> helper. This will cause issues for the arch that has virtually tagged
> caches. The way to fix is to
Vhost log dirty pages directly to a userspace bitmap through GUP and
kmap_atomic() since kernel doesn't have a set_bit_to_user()
helper. This will cause issues for the arch that has virtually tagged
caches. The way to fix is to keep using userspace virtual
address. Fortunately, futex has
> >
> > This patch adds 'DAXDEV_SYNC' flag which is set
> > for nd_region doing synchronous flush. This later
> > is used to disable MAP_SYNC functionality for
> > ext4 & xfs filesystem for devices don't support
> > synchronous flush.
> >
> > Signed-off-by: Pankaj Gupta
> [..]
> > diff --git
On Fri, 26 Apr 2019 20:32:42 +0200
Halil Pasic wrote:
> Protected virtualization guests have to use shared pages for airq
> notifier bit vectors, because hypervisor needs to write these bits.
>
> Let us make sure we allocate DMA memory for the notifier bit vectors.
>
> Signed-off-by: Halil
On Wed, 8 May 2019 23:22:10 +0200
Halil Pasic wrote:
> On Wed, 8 May 2019 15:18:10 +0200 (CEST)
> Sebastian Ott wrote:
> > > @@ -1063,6 +1163,7 @@ static int __init css_bus_init(void)
> > > unregister_reboot_notifier(_reboot_notifier);
> > > goto out_unregister;
> > > }
>
On Wed, 8 May 2019, Halil Pasic wrote:
> On Wed, 8 May 2019 15:46:42 +0200 (CEST)
> Sebastian Ott wrote:
> > On Fri, 26 Apr 2019, Halil Pasic wrote:
> > > static struct ccw_device * io_subchannel_allocate_dev(struct subchannel
> > > *sch)
> > > {
> > [..]
> > > + cdev->private =
On Wed, 8 May 2019, Halil Pasic wrote:
> On Wed, 8 May 2019 15:18:10 +0200 (CEST)
> Sebastian Ott wrote:
> > > @@ -1063,6 +1163,7 @@ static int __init css_bus_init(void)
> > > unregister_reboot_notifier(_reboot_notifier);
> > > goto out_unregister;
> > > }
> > > +
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