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virtio: virtio 1.0 cs04 spec compliance for reset #2

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virtio: virtio 1.0 cs04 spec compliance for reset #2

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8 changes: 8 additions & 0 deletions src/hw/virtio-pci.c
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
#include "pcidevice.h" // struct pci_device
#include "pci_regs.h" // PCI_BASE_ADDRESS_0
#include "string.h" // memset
#include "util.h" // timer_calc
#include "virtio-pci.h"
#include "virtio-mmio.h"
#include "virtio-ring.h"
Expand Down Expand Up @@ -270,7 +271,14 @@ void vp_reset(struct vp_device *vp)
vp_write(&vp->common, virtio_mmio_cfg, device_status, 0);
vp_read(&vp->common, virtio_mmio_cfg, irq_status);
} else if (vp->use_modern) {
/* 0 status means a reset. */
vp_write(&vp->common, virtio_pci_common_cfg, device_status, 0);
/* After writing 0 to device_status, the driver MUST wait for a read of
* device_status to return 0 before reinitializing the device.
*/
while (vp_read(&vp->common, virtio_pci_common_cfg, device_status) != 0) {
msleep(1);
}
vp_read(&vp->isr, virtio_pci_isr, isr);
} else {
vp_write(&vp->legacy, virtio_pci_legacy, status, 0);
Expand Down