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bhyve: Support other schemes for naming pass-through devices.
Permit naming pass through devices using the syntax accepted by pciconf (pci[<domain>:]<bus>:<slot>:<func>) as well as by device name (e.g. "ppt0"). While here, fix an error in the manpage that had the bus and slot arguments for the original /-delimited scheme swapped. Reviewed by: imp, markj Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D36147
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7647626d33
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baf753cc19
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@ -24,7 +24,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 28, 2021
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.Dd August 19, 2022
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.Dt BHYVE 8
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.Os
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.Sh NAME
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@ -390,6 +390,7 @@ Network device backends:
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.Xc
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.El
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.Sm on
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.Pp
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If
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.Cm mac
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is not specified, the MAC address is derived from a fixed OUI and the
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@ -520,14 +521,32 @@ to that file.
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.El
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.Pp
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Pass-through device backends:
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.Bl -tag -width 10n
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.It Ns Ar slot Ns Cm \&/ Ns Ar bus Ns Cm \&/ Ns Ar function
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Connect to a PCI device on the host at the selector described by
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.Sm off
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.Bl -bullet
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.It
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.Cm ppt Ar N Oo , Ar passthru-device-options Oc
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.It
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.Ns Ar bus Cm \&/ Ar slot Cm \&/ Ar function
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.Op , Ar passthru-device-options
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.It
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.Cm pci Ar bus Cm : Ar slot Cm : Ns Ar function
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.Op , Ar passthru-device-options
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.El
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.Sm on
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.Pp
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Connect to a PCI device on the host either named ppt
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.Ns Ar N
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or at the selector described by
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.Ar slot ,
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.Ar bus ,
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and
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.Ar function
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numbers.
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.Pp
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The
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.Ar passthru-device-options
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are:
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.Bl -tag -width 10n
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.It Cm rom= Ns Ar romfile
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Add
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.Ar romfile
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@ -23,7 +23,7 @@
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd June 30, 2022
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.Dd August 19, 2022
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.Dt BHYVE_CONFIG 5
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.Os
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.Sh NAME
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@ -575,6 +575,12 @@ If set, allocate a memory disk as the backing store.
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The value of this variable is the size of the memory disk in megabytes.
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.El
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.Ss PCI Passthrough Settings
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The
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.Xr ppt 4
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device driver must be attached to the
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PCI device being passed through.
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The device to pass through can be identified either by name or its
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host PCI bus location.
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.Bl -column "Name" "integer" "Default"
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.It Sy Name Ta Sy Format Ta Sy Default Ta Sy Description
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.It Va bus Ta integer Ta Ta
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@ -583,6 +589,10 @@ Host PCI bus address of device to pass through.
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Host PCI slot address of device to pass through.
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.It Va func Ta integer Ta Ta
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Host PCI function address of device to pass through.
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.It Va pptdev Ta string Ta Ta
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Name of a
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.Xr ppt 4
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device to pass through.
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.It Va rom Ta path Ta Ta
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ROM file of the device which will be executed by OVMF to init the device.
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.El
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@ -52,6 +52,7 @@ __FBSDID("$FreeBSD$");
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#ifndef WITHOUT_CAPSICUM
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#include <capsicum_helpers.h>
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#endif
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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@ -132,7 +133,7 @@ pcifd_init(void)
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errx(EX_OSERR, "Unable to apply rights for sandbox");
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const cap_ioctl_t pcifd_ioctls[] = { PCIOCREAD, PCIOCWRITE, PCIOCGETBAR,
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PCIOCBARIO, PCIOCBARMMAP };
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PCIOCBARIO, PCIOCBARMMAP, PCIOCGETCONF };
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if (caph_ioctls_limit(pcifd, pcifd_ioctls, nitems(pcifd_ioctls)) == -1)
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errx(EX_OSERR, "Unable to apply rights for sandbox");
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#endif
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@ -645,30 +646,39 @@ cfginit(struct vmctx *ctx, struct pci_devinst *pi, int bus, int slot, int func)
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static int
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passthru_legacy_config(nvlist_t *nvl, const char *opts)
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{
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const char *cp;
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char *tofree;
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char value[16];
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int bus, slot, func;
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if (opts == NULL)
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return (0);
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if (sscanf(opts, "%d/%d/%d", &bus, &slot, &func) != 3) {
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cp = strchr(opts, ',');
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if (strncmp(opts, "ppt", strlen("ppt")) == 0) {
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tofree = strndup(opts, cp - opts);
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set_config_value_node(nvl, "pptdev", tofree);
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free(tofree);
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} else if (sscanf(opts, "pci0:%d:%d:%d", &bus, &slot, &func) == 3 ||
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sscanf(opts, "pci%d:%d:%d", &bus, &slot, &func) == 3 ||
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sscanf(opts, "%d/%d/%d", &bus, &slot, &func) == 3) {
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snprintf(value, sizeof(value), "%d", bus);
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set_config_value_node(nvl, "bus", value);
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snprintf(value, sizeof(value), "%d", slot);
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set_config_value_node(nvl, "slot", value);
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snprintf(value, sizeof(value), "%d", func);
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set_config_value_node(nvl, "func", value);
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} else {
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EPRINTLN("passthru: invalid options \"%s\"", opts);
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return (-1);
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}
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snprintf(value, sizeof(value), "%d", bus);
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set_config_value_node(nvl, "bus", value);
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snprintf(value, sizeof(value), "%d", slot);
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set_config_value_node(nvl, "slot", value);
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snprintf(value, sizeof(value), "%d", func);
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set_config_value_node(nvl, "func", value);
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opts = strchr(opts, ',');
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if (opts == NULL) {
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if (cp == NULL) {
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return (0);
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}
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return pci_parse_legacy_config(nvl, opts + 1);
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return (pci_parse_legacy_config(nvl, cp + 1));
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}
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static int
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@ -722,6 +732,72 @@ passthru_init_rom(struct vmctx *const ctx, struct passthru_softc *const sc,
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return (0);
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}
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static bool
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passthru_lookup_pptdev(const char *name, int *bus, int *slot, int *func)
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{
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struct pci_conf_io pc;
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struct pci_conf conf[1];
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struct pci_match_conf patterns[1];
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char *cp;
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bzero(&pc, sizeof(struct pci_conf_io));
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pc.match_buf_len = sizeof(conf);
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pc.matches = conf;
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bzero(&patterns, sizeof(patterns));
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/*
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* The pattern structure requires the unit to be split out from
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* the driver name. Walk backwards from the end of the name to
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* find the start of the unit.
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*/
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cp = strchr(name, '\0');
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assert(cp != NULL);
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while (cp != name && isdigit(cp[-1]))
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cp--;
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if (cp == name || !isdigit(*cp)) {
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EPRINTLN("Invalid passthru device name %s", name);
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return (false);
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}
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if ((size_t)(cp - name) + 1 > sizeof(patterns[0].pd_name)) {
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EPRINTLN("Passthru device name %s is too long", name);
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return (false);
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}
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memcpy(patterns[0].pd_name, name, cp - name);
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patterns[0].pd_unit = strtol(cp, &cp, 10);
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if (*cp != '\0') {
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EPRINTLN("Invalid passthru device name %s", name);
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return (false);
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}
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patterns[0].flags = PCI_GETCONF_MATCH_NAME | PCI_GETCONF_MATCH_UNIT;
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pc.num_patterns = 1;
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pc.pat_buf_len = sizeof(patterns);
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pc.patterns = patterns;
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if (ioctl(pcifd, PCIOCGETCONF, &pc) == -1) {
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EPRINTLN("ioctl(PCIOCGETCONF): %s", strerror(errno));
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return (false);
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}
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if (pc.status != PCI_GETCONF_LAST_DEVICE &&
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pc.status != PCI_GETCONF_MORE_DEVS) {
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EPRINTLN("error returned from PCIOCGETCONF ioctl");
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return (false);
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}
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if (pc.num_matches == 0) {
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EPRINTLN("Passthru device %s not found", name);
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return (false);
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}
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if (conf[0].pc_sel.pc_domain != 0) {
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EPRINTLN("Passthru device %s on unsupported domain", name);
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return (false);
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}
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*bus = conf[0].pc_sel.pc_bus;
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*slot = conf[0].pc_sel.pc_dev;
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*func = conf[0].pc_sel.pc_func;
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return (true);
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}
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static int
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passthru_init(struct vmctx *ctx, struct pci_devinst *pi, nvlist_t *nvl)
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{
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var = atoi(value); \
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} while (0)
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GET_INT_CONFIG(bus, "bus");
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GET_INT_CONFIG(slot, "slot");
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GET_INT_CONFIG(func, "func");
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value = get_config_value_node(nvl, "pptdev");
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if (value != NULL) {
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if (!passthru_lookup_pptdev(value, &bus, &slot, &func))
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return (error);
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} else {
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GET_INT_CONFIG(bus, "bus");
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GET_INT_CONFIG(slot, "slot");
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GET_INT_CONFIG(func, "func");
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}
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if (vm_assign_pptdev(ctx, bus, slot, func) != 0) {
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warnx("PCI device at %d/%d/%d is not using the ppt(4) driver",
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