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virtio-pci: address space translation service (ATS) support

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This patches enable the Address Translation Service support for virtio
pci devices. This is needed for a guest visible Device IOTLB
implementation and will be required by vhost device IOTLB API
implementation for intel IOMMU.

Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2016-12-30 18:09:15 +08:00 committed by Michael S. Tsirkin
parent 554f5e1604
commit 615c4ed205
5 changed files with 31 additions and 0 deletions
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15
hw/pci/pcie.c
View File

@ -717,3 +717,18 @@ void pcie_dev_ser_num_init(PCIDevice *dev, uint16_t offset, uint64_t ser_num)
PCI_EXT_CAP_DSN_SIZEOF);
pci_set_quad(dev->config + offset + pci_dsn_cap, ser_num);
}
void pcie_ats_init(PCIDevice *dev, uint16_t offset)
{
pcie_add_capability(dev, PCI_EXT_CAP_ID_ATS, 0x1,
offset, PCI_EXT_CAP_ATS_SIZEOF);
dev->exp.ats_cap = offset;
/* Invalidate Queue Depth 0, Page Aligned Request 0 */
pci_set_word(dev->config + offset + PCI_ATS_CAP, 0);
/* STU 0, Disabled by default */
pci_set_word(dev->config + offset + PCI_ATS_CTRL, 0);
pci_set_word(dev->wmask + dev->exp.ats_cap + PCI_ATS_CTRL, 0x800f);
}

7
hw/virtio/virtio-pci.c
View File

@ -1815,6 +1815,11 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
* PCI Power Management Interface Specification.
*/
pci_set_word(pci_dev->config + pos + PCI_PM_PMC, 0x3);
if (proxy->flags & VIRTIO_PCI_FLAG_ATS) {
pcie_ats_init(pci_dev, 256);
}
} else {
/*
* make future invocations of pci_is_express() return false
@ -1868,6 +1873,8 @@ static Property virtio_pci_properties[] = {
VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT, false),
DEFINE_PROP_BOOL("x-ignore-backend-features", VirtIOPCIProxy,
ignore_backend_features, false),
DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_ATS_BIT, false),
DEFINE_PROP_END_OF_LIST(),
};

4
hw/virtio/virtio-pci.h
View File

@ -72,6 +72,7 @@ enum {
VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT,
VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT,
VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT,
VIRTIO_PCI_FLAG_ATS_BIT,
};
/* Need to activate work-arounds for buggy guests at vmstate load. */
@ -96,6 +97,9 @@ enum {
#define VIRTIO_PCI_FLAG_PAGE_PER_VQ \
(1 << VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT)
/* address space translation service */
#define VIRTIO_PCI_FLAG_ATS (1 << VIRTIO_PCI_FLAG_ATS_BIT)
typedef struct {
MSIMessage msg;
int virq;

4
include/hw/pci/pcie.h
View File

@ -74,6 +74,9 @@ struct PCIExpressDevice {
/* AER */
uint16_t aer_cap;
PCIEAERLog aer_log;
/* Offset of ATS capability in config space */
uint16_t ats_cap;
};
#define COMPAT_PROP_PCP "power_controller_present"
@ -120,6 +123,7 @@ void pcie_add_capability(PCIDevice *dev,
void pcie_ari_init(PCIDevice *dev, uint16_t offset, uint16_t nextfn);
void pcie_dev_ser_num_init(PCIDevice *dev, uint16_t offset, uint64_t ser_num);
void pcie_ats_init(PCIDevice *dev, uint16_t offset);
extern const VMStateDescription vmstate_pcie_device;

1
include/standard-headers/linux/pci_regs.h
View File

@ -678,6 +678,7 @@
#define PCI_EXT_CAP_ID_MAX PCI_EXT_CAP_ID_PTM
#define PCI_EXT_CAP_DSN_SIZEOF 12
#define PCI_EXT_CAP_ATS_SIZEOF 8
#define PCI_EXT_CAP_MCAST_ENDPOINT_SIZEOF 40
/* Advanced Error Reporting */