On Tue, Apr 11, 2023 at 9:39 AM Angus Chen <angus.chen@xxxxxxxxxxxxxxx> wrote: > > We read the status of device after reset, > It is not guaranteed that the device be reseted successfully. > We can use a while loop to make sure that,like the modern device did. > The spec is not request it ,but it work. The only concern is if it's too late to do this. Btw, any reason you want to have a legacy hardware implementation. It will be very tricky to work correctly. Thanks > > Signed-off-by: Angus Chen <angus.chen@xxxxxxxxxxxxxxx> > --- > drivers/virtio/virtio_pci_legacy.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c > index 2257f1b3d8ae..f2d241563e4f 100644 > --- a/drivers/virtio/virtio_pci_legacy.c > +++ b/drivers/virtio/virtio_pci_legacy.c > @@ -14,6 +14,7 @@ > * Michael S. Tsirkin <mst@xxxxxxxxxx> > */ > > +#include <linux/delay.h> > #include "linux/virtio_pci_legacy.h" > #include "virtio_pci_common.h" > > @@ -97,7 +98,8 @@ static void vp_reset(struct virtio_device *vdev) > vp_legacy_set_status(&vp_dev->ldev, 0); > /* Flush out the status write, and flush in device writes, > * including MSi-X interrupts, if any. */ > - vp_legacy_get_status(&vp_dev->ldev); > + while (vp_legacy_get_status(&vp_dev->ldev)) > + msleep(1); > /* Flush pending VQ/configuration callbacks. */ > vp_synchronize_vectors(vdev); > } > -- > 2.25.1 > _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
