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SubjectRe: [PATCH 05/19] virtio: Implement get_shm_region for MMIO transport
On Tue, Aug 27, 2019 at 10:39:43AM +0200, Cornelia Huck wrote:
> On Wed, 21 Aug 2019 13:57:06 -0400
> Vivek Goyal <vgoyal@redhat.com> wrote:
>
> > From: Sebastien Boeuf <sebastien.boeuf@intel.com>
> >
> > On MMIO a new set of registers is defined for finding SHM
> > regions. Add their definitions and use them to find the region.
> >
> > Cc: kvm@vger.kernel.org
> > Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
> > ---
> > drivers/virtio/virtio_mmio.c | 32 ++++++++++++++++++++++++++++++++
> > include/uapi/linux/virtio_mmio.h | 11 +++++++++++
> > 2 files changed, 43 insertions(+)
> >
> > diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> > index e09edb5c5e06..5c07985c8cb8 100644
> > --- a/drivers/virtio/virtio_mmio.c
> > +++ b/drivers/virtio/virtio_mmio.c
> > @@ -500,6 +500,37 @@ static const char *vm_bus_name(struct virtio_device *vdev)
> > return vm_dev->pdev->name;
> > }
> >
> > +static bool vm_get_shm_region(struct virtio_device *vdev,
> > + struct virtio_shm_region *region, u8 id)
> > +{
> > + struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
> > + u64 len, addr;
> > +
> > + /* Select the region we're interested in */
> > + writel(id, vm_dev->base + VIRTIO_MMIO_SHM_SEL);
> > +
> > + /* Read the region size */
> > + len = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_LOW);
> > + len |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_HIGH) << 32;
> > +
> > + region->len = len;
> > +
> > + /* Check if region length is -1. If that's the case, the shared memory
> > + * region does not exist and there is no need to proceed further.
> > + */
> > + if (len == ~(u64)0) {
> > + return false;
> > + }
>
> I think the curly braces should be dropped here.

Will do.

Thanks
Vivek

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