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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

5
hw/virtio/virtio-pci.c
View file

@ -1856,7 +1856,8 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
}
if (proxy->flags & VIRTIO_PCI_FLAG_ATS) {
pcie_ats_init(pci_dev, last_pcie_cap_offset);
pcie_ats_init(pci_dev, last_pcie_cap_offset,
proxy->flags & VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED);
last_pcie_cap_offset += PCI_EXT_CAP_ATS_SIZEOF;
}
@ -1933,6 +1934,8 @@ static Property virtio_pci_properties[] = {
ignore_backend_features, false),
DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_ATS_BIT, false),
DEFINE_PROP_BIT("x-ats-page-aligned", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT, true),
DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_INIT_DEVERR_BIT, true),
DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy, flags,

5
hw/virtio/virtio-pci.h
View file

@ -42,6 +42,7 @@ enum {
VIRTIO_PCI_FLAG_INIT_PM_BIT,
VIRTIO_PCI_FLAG_INIT_FLR_BIT,
VIRTIO_PCI_FLAG_AER_BIT,
VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT,
};
/* Need to activate work-arounds for buggy guests at vmstate load. */
@ -84,6 +85,10 @@ enum {
/* Advanced Error Reporting capability */
#define VIRTIO_PCI_FLAG_AER (1 << VIRTIO_PCI_FLAG_AER_BIT)
/* Page Aligned Address space Translation Service */
#define VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED \
(1 << VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT)
typedef struct {
MSIMessage msg;
int virq;