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hw/pcie-root-port: Fix hotplug for PCI devices requiring IO

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Q35 has now ACPI hotplug enabled by default for PCI(e) devices.
As opposed to native PCIe hotplug, guests like Fedora 34
will not assign IO range to pcie-root-ports not supporting
native hotplug, resulting into a regression.

Reproduce by:
    qemu-bin -M q35 -device pcie-root-port,id=p1 -monitor stdio
    device_add e1000,bus=p1
In the Guest OS the respective pcie-root-port will have the IO range
disabled.

Fix it by setting the "reserve-io" hint capability of the
pcie-root-ports so the firmware will allocate the IO range instead.

Acked-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
Message-Id: <20210802090057.1709775-1-marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marcel Apfelbaum 2021-08-02 12:00:57 +03:00 committed by Michael S. Tsirkin
parent f2da205cb4
commit e2a6290aab
1 changed files with 5 additions and 0 deletions
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5
hw/pci-bridge/gen_pcie_root_port.c
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@ -28,6 +28,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(GenPCIERootPort, GEN_PCIE_ROOT_PORT)
(GEN_PCIE_ROOT_PORT_AER_OFFSET + PCI_ERR_SIZEOF)
#define GEN_PCIE_ROOT_PORT_MSIX_NR_VECTOR 1
#define GEN_PCIE_ROOT_DEFAULT_IO_RANGE 4096
struct GenPCIERootPort {
/*< private >*/
@ -75,6 +76,7 @@ static bool gen_rp_test_migrate_msix(void *opaque, int version_id)
static void gen_rp_realize(DeviceState *dev, Error **errp)
{
PCIDevice *d = PCI_DEVICE(dev);
PCIESlot *s = PCIE_SLOT(d);
GenPCIERootPort *grp = GEN_PCIE_ROOT_PORT(d);
PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
Error *local_err = NULL;
@ -85,6 +87,9 @@ static void gen_rp_realize(DeviceState *dev, Error **errp)
return;
}
if (grp->res_reserve.io == -1 && s->hotplug && !s->native_hotplug) {
grp->res_reserve.io = GEN_PCIE_ROOT_DEFAULT_IO_RANGE;
}
int rc = pci_bridge_qemu_reserve_cap_init(d, 0,
grp->res_reserve, errp);