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dm/VBS-U: implement virtio_dev_error 

When the device has experienced an error from which it cannot
re-cover, DEVICE_NEEDS_RESET is set to the device status register
and a config change intr is sent to the guest driver.

Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>
Reviewed-by: Hao Li <hao.l.li@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Jian Jun Chen 2018-03-29 12:29:00 +08:00 committed by Jack Ren
parent ce098260de
commit 0398498846
2 changed files with 26 additions and 0 deletions
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13
devicemodel/hw/pci/virtio/virtio.c
View File

@ -1008,6 +1008,19 @@ virtio_set_modern_bar(struct virtio_base *base, bool use_notify_pio)
return rc;
}
void
virtio_dev_error(struct virtio_base *base)
{
if (base->negotiated_caps & VIRTIO_F_VERSION_1) {
/* see 2.1.2. if DRIVER_OK is set, need to send
* a device configuration change notification to the driver
*/
base->status |= VIRTIO_CR_STATUS_NEEDS_RESET;
if (base->status & VIRTIO_CR_STATUS_DRIVER_OK)
virtio_config_changed(base);
}
}
static struct cap_region {
uint64_t cap_offset; /* offset of capability region */
int cap_size; /* size of capability region */

13
devicemodel/include/virtio.h
View File

@ -841,6 +841,19 @@ uint64_t virtio_pci_read(struct vmctx *ctx, int vcpu, struct pci_vdev *dev,
void virtio_pci_write(struct vmctx *ctx, int vcpu, struct pci_vdev *dev,
int baridx, uint64_t offset, int size, uint64_t value);
/**
* @brief Indicate the device has experienced an error.
*
* This is called when the device has experienced an error from which it
* cannot re-cover. DEVICE_NEEDS_RESET is set to the device status register
* and a config change intr is sent to the guest driver.
*
* @param base Pointer to struct virtio_base.
*
* @return N/A
*/
void virtio_dev_error(struct virtio_base *base);
/**
* @brief Set modern BAR (usually 4) to map PCI config registers.
*