Using the kernel 4.19.0-rc2 it works now, so With the fix for not
calling fput when memfd == NULL the patch is
Reviewed-By: Gert Wollny
best,
Gert
Am Montag, den 10.09.2018, 15:30 +0200 schrieb Gerd Hoffmann:
> On Mon, Sep 10, 2018 at 01:31:08PM +0200, Gert Wollny wrote:
> > Am Montag, den 1
Am Montag, den 10.09.2018, 15:30 +0200 schrieb Gerd Hoffmann:
> On Mon, Sep 10, 2018 at 01:31:08PM +0200, Gert Wollny wrote:
> > Am Montag, den 10.09.2018, 12:53 +0200 schrieb Gerd Hoffmann:
> > >
> > > By default qemu doesn't use memfd for backing storage, you have
> > > to
> > > explicitly confi
Am Montag, den 10.09.2018, 15:30 +0200 schrieb Gerd Hoffmann:
> On Mon, Sep 10, 2018 at 01:31:08PM +0200, Gert Wollny wrote:
> > Am Montag, den 10.09.2018, 12:53 +0200 schrieb Gerd Hoffmann:
> > >
> > > By default qemu doesn't use memfd for backing storage, you have
> > > to
> > > explicitly confi
On Mon, Sep 10, 2018 at 01:31:08PM +0200, Gert Wollny wrote:
> Am Montag, den 10.09.2018, 12:53 +0200 schrieb Gerd Hoffmann:
> >
> > By default qemu doesn't use memfd for backing storage, you have to
> > explicitly configure qemu that way (see qemu commit log of the test
> > branch):
> >
> >
Am Montag, den 10.09.2018, 12:53 +0200 schrieb Gerd Hoffmann:
>
> By default qemu doesn't use memfd for backing storage, you have to
> explicitly configure qemu that way (see qemu commit log of the test
> branch):
>
> qemu-system-x86_64 -m 2G
> -object memory-backend-memfd,id=ram,
On Mon, Sep 10, 2018 at 11:18:38AM +0200, Gert Wollny wrote:
> Am Montag, den 10.09.2018, 10:37 +0200 schrieb Gerd Hoffmann:
> ...
>
> > > The other question is of course, why did dma_buf_export fail for me
> > > ...
> >
> > What exactly did you try?
>
> I ran
>
> qemu-system-x86_64 -enable-k
Am Montag, den 10.09.2018, 10:37 +0200 schrieb Gerd Hoffmann:
...
> > The other question is of course, why did dma_buf_export fail for me
> > ...
>
> What exactly did you try?
I ran
qemu-system-x86_64 -enable-kvm -smp 5 -M q35 -m 8G \
-drive format=raw,file=ubuntu.raw,if=virtio \
-n
Hi,
> > + fput(memfd);
> > + }
> > + memfd = NULL;
> Now memfd is NULL
> > + buf = dma_buf_export(&exp_info);
> > + if (IS_ERR(buf)) {
> > + ret = PTR_ERR(buf);
> > + goto err_put_pages;
> Assume an error occured
> > +err_put_pages:
> > + while (pgbuf
I am by no means a kernel expert, but Tomeu asked whether I could
review this. Generally the patch looks okay, it applied (on top of
4.18.5-gentoo), and compiled without problems.
However, running the experimental qemu branch I get a kernel bug:
BUG: unable to handle kernel NULL pointer derefere
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