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virtio_pci_legacy: Allow memory space for configuration

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For guests running under some kind of VMMs, configuration structure is
available in memory space but not I/O space.

Reported by:	Yuan Rui <number201724@me.com>
Reviewed by:	rpokala, bryanv, jhb
Approved by:	philip (mentor)
Differential Revision:	https://reviews.freebsd.org/D28818

(cherry picked from commit cf5d111240)
This commit is contained in:
Ka Ho Ng 2021-03-20 15:40:55 +08:00
parent 98740ead97
commit 2e107638ea
1 changed files with 18 additions and 6 deletions
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24
sys/dev/virtio/pci/virtio_pci_legacy.c
View file

@ -59,6 +59,7 @@ __FBSDID("$FreeBSD$");
struct vtpci_legacy_softc {
device_t vtpci_dev;
struct vtpci_common vtpci_common;
int vtpci_res_type;
struct resource *vtpci_res;
struct resource *vtpci_msix_table_res;
struct resource *vtpci_msix_pba_res;
@ -231,7 +232,7 @@ vtpci_legacy_attach(device_t dev)
error = vtpci_legacy_alloc_resources(sc);
if (error) {
device_printf(dev, "cannot map I/O space\n");
device_printf(dev, "cannot map I/O space nor memory space\n");
return (error);
}
@ -601,14 +602,25 @@ vtpci_legacy_teardown_msix(struct vtpci_legacy_softc *sc)
static int
vtpci_legacy_alloc_resources(struct vtpci_legacy_softc *sc)
{
const int res_types[] = { SYS_RES_IOPORT, SYS_RES_MEMORY };
device_t dev;
int rid;
int rid, i;
dev = sc->vtpci_dev;
rid = PCIR_BAR(0);
if ((sc->vtpci_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
&rid, RF_ACTIVE)) == NULL)
/*
* Most hypervisors export the common configuration structure in IO
* space, but some use memory space; try both.
*/
for (i = 0; nitems(res_types); i++) {
rid = PCIR_BAR(0);
sc->vtpci_res_type = res_types[i];
sc->vtpci_res = bus_alloc_resource_any(dev, res_types[i], &rid,
RF_ACTIVE);
if (sc->vtpci_res != NULL)
break;
}
if (sc->vtpci_res == NULL)
return (ENXIO);
return (0);
@ -622,7 +634,7 @@ vtpci_legacy_free_resources(struct vtpci_legacy_softc *sc)
dev = sc->vtpci_dev;
if (sc->vtpci_res != NULL) {
bus_release_resource(dev, SYS_RES_IOPORT, PCIR_BAR(0),
bus_release_resource(dev, sc->vtpci_res_type, PCIR_BAR(0),
sc->vtpci_res);
sc->vtpci_res = NULL;
}