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bhyve: export funcs for read/write pci config

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Export functions for reading and writing the pci config space from passthru
device to be used by other devices.
This is required for lpc devices to set their vendor/device ids to their
physical values.
Otherwise, GPU passthrough for integrated Intel GPUs won't work properly.

Differential Revision:	https://reviews.freebsd.org/D33769
Reviewed by:	markj
Sponsored by:	Beckhoff Automation GmbH & Co. KG
MFC after:	1 month
This commit is contained in:
Corvin Köhne 2022-03-10 11:26:19 +01:00 committed by Emmanuel Vadot
parent b344de4d0d
commit 563fd2240e
2 changed files with 51 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
usr.sbin/bhyve/pci_passthru.c
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@ -61,12 +61,11 @@ __FBSDID("$FreeBSD$");
#include <unistd.h>
#include <machine/vmm.h>
#include <vmmapi.h>
#include "config.h"
#include "debug.h"
#include "pci_emul.h"
#include "mem.h"
#include "pci_passthru.h"
#ifndef _PATH_DEVPCI
#define _PATH_DEVPCI "/dev/pci"
@ -115,9 +114,36 @@ msi_caplen(int msgctrl)
return (len);
}
static uint32_t
static int
pcifd_init() {
pcifd = open(_PATH_DEVPCI, O_RDWR, 0);
if (pcifd < 0) {
warn("failed to open %s", _PATH_DEVPCI);
return (1);
}
#ifndef WITHOUT_CAPSICUM
cap_rights_t pcifd_rights;
cap_rights_init(&pcifd_rights, CAP_IOCTL, CAP_READ, CAP_WRITE);
if (caph_rights_limit(pcifd, &pcifd_rights) == -1)
errx(EX_OSERR, "Unable to apply rights for sandbox");
const cap_ioctl_t pcifd_ioctls[] = { PCIOCREAD, PCIOCWRITE, PCIOCGETBAR,
PCIOCBARIO, PCIOCBARMMAP };
if (caph_ioctls_limit(pcifd, pcifd_ioctls, nitems(pcifd_ioctls)) == -1)
errx(EX_OSERR, "Unable to apply rights for sandbox");
#endif
return (0);
}
uint32_t
read_config(const struct pcisel *sel, long reg, int width)
{
if (pcifd < 0 && pcifd_init()) {
return (0);
}
struct pci_io pi;
bzero(&pi, sizeof(pi));
@ -131,9 +157,13 @@ read_config(const struct pcisel *sel, long reg, int width)
return (pi.pi_data);
}
static void
void
write_config(const struct pcisel *sel, long reg, int width, uint32_t data)
{
if (pcifd < 0 && pcifd_init()) {
return;
}
struct pci_io pi;
bzero(&pi, sizeof(pi));
@ -638,40 +668,20 @@ passthru_init(struct vmctx *ctx, struct pci_devinst *pi, nvlist_t *nvl)
int bus, slot, func, error, memflags;
struct passthru_softc *sc;
const char *value;
#ifndef WITHOUT_CAPSICUM
cap_rights_t rights;
cap_ioctl_t pci_ioctls[] =
{ PCIOCREAD, PCIOCWRITE, PCIOCGETBAR, PCIOCBARIO, PCIOCBARMMAP };
#endif
sc = NULL;
error = 1;
#ifndef WITHOUT_CAPSICUM
cap_rights_init(&rights, CAP_IOCTL, CAP_READ, CAP_WRITE);
#endif
memflags = vm_get_memflags(ctx);
if (!(memflags & VM_MEM_F_WIRED)) {
warnx("passthru requires guest memory to be wired");
return (error);
}
if (pcifd < 0) {
pcifd = open(_PATH_DEVPCI, O_RDWR, 0);
if (pcifd < 0) {
warn("failed to open %s", _PATH_DEVPCI);
return (error);
}
if (pcifd < 0 && pcifd_init()) {
return (error);
}
#ifndef WITHOUT_CAPSICUM
if (caph_rights_limit(pcifd, &rights) == -1)
errx(EX_OSERR, "Unable to apply rights for sandbox");
if (caph_ioctls_limit(pcifd, pci_ioctls, nitems(pci_ioctls)) == -1)
errx(EX_OSERR, "Unable to apply rights for sandbox");
#endif
#define GET_INT_CONFIG(var, name) do { \
value = get_config_value_node(nvl, name); \
if (value == NULL) { \

15
usr.sbin/bhyve/pci_passthru.h Normal file
View File

@ -0,0 +1,15 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2020 Beckhoff Automation GmbH & Co. KG
* Author: Corvin Köhne <c.koehne@beckhoff.com>
*/
#pragma once
#include <vmmapi.h>
#include "pci_emul.h"
uint32_t read_config(const struct pcisel *sel, long reg, int width);
void write_config(const struct pcisel *sel, long reg, int width, uint32_t data);