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virtio-pci: compat page aligned ATS

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Commit 4c70875372 ("pci: advertise a page aligned ATS") advertises
the page aligned via ATS capability (RO) to unbrek recent Linux IOMMU
drivers since 5.2. But it forgot the compat the capability which
breaks the migration from old machine type:

(qemu) qemu-kvm: get_pci_config_device: Bad config data: i=0x104 read:
0 device: 20 cmask: ff wmask: 0 w1cmask:0

This patch introduces a new parameter "x-ats-page-aligned" for
virtio-pci device and turns it on for machine type which is newer than
5.1.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: qemu-stable@nongnu.org
Fixes: 4c70875372 ("pci: advertise a page aligned ATS")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20210406040330.11306-1-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 2021-04-06 12:03:30 +08:00 • committed by Michael S. Tsirkin
parent 90a66f4847
commit d83f46d189
5 changed files with 17 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

10
hw/pci/pcie.c
View file

@ -963,16 +963,18 @@ void pcie_dev_ser_num_init(PCIDevice *dev, uint16_t offset, uint64_t ser_num)
pci_set_quad(dev->config + offset + pci_dsn_cap, ser_num);
}
void pcie_ats_init(PCIDevice *dev, uint16_t offset)
void pcie_ats_init(PCIDevice *dev, uint16_t offset, bool aligned)
{
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 1 */
pci_set_word(dev->config + offset + PCI_ATS_CAP,
PCI_ATS_CAP_PAGE_ALIGNED);
/* Invalidate Queue Depth 0 */
if (aligned) {
pci_set_word(dev->config + offset + PCI_ATS_CAP,
PCI_ATS_CAP_PAGE_ALIGNED);
}
/* STU 0, Disabled by default */
pci_set_word(dev->config + offset + PCI_ATS_CTRL, 0);