d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

bhyve: read OpRegion address and size for GVT-d

Browse Source 
The OpRegion provides some configuration bits and ACPI methods used by
some Intel drivers. The guest needs access to it. In the first step,
we're reading it's address and size.

Reviewed by:		jhb
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D40040
This commit is contained in:
Corvin Köhne 2023-05-10 13:38:02 +02:00
parent d9fa7c113d
commit 6952b9d25e
No known key found for this signature in database
GPG Key ID: D854DA56315E026A
1 changed files with 66 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
usr.sbin/bhyve/pci_gvt-d.c
View File

@ -6,12 +6,16 @@
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/sysctl.h>
#include <dev/pci/pcireg.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include "e820.h"
#include "pci_gvt-d-opregion.h"
@ -21,14 +25,20 @@
#define MB (1024 * KB)
#define GB (1024 * MB)
#ifndef _PATH_MEM
#define _PATH_MEM "/dev/mem"
#endif
#define PCI_VENDOR_INTEL 0x8086
#define PCIR_BDSM 0x5C /* Base of Data Stolen Memory register */
#define PCIR_BDSM 0x5C /* Base of Data Stolen Memory register */
#define PCIR_ASLS_CTL 0xFC /* Opregion start address register */
#define PCIM_BDSM_GSM_ALIGNMENT \
0x00100000 /* Graphics Stolen Memory is 1 MB aligned */
#define GVT_D_MAP_GSM 0
#define GVT_D_MAP_OPREGION 1
static int
gvt_d_probe(struct pci_devinst *const pi)
@ -167,6 +177,56 @@ gvt_d_setup_gsm(struct pci_devinst *const pi)
passthru_cfgwrite_emulate));
}
static int
gvt_d_setup_opregion(struct pci_devinst *const pi)
{
struct passthru_softc *sc;
struct passthru_mmio_mapping *opregion;
struct igd_opregion_header *header;
uint64_t asls;
int memfd;
sc = pi->pi_arg;
memfd = open(_PATH_MEM, O_RDONLY, 0);
if (memfd < 0) {
warn("%s: Failed to open %s", __func__, _PATH_MEM);
return (-1);
}
opregion = passthru_get_mmio(sc, GVT_D_MAP_OPREGION);
if (opregion == NULL) {
warnx("%s: Unable to access opregion", __func__);
close(memfd);
return (-1);
}
asls = read_config(passthru_get_sel(sc), PCIR_ASLS_CTL, 4);
header = mmap(NULL, sizeof(*header), PROT_READ, MAP_SHARED, memfd,
asls);
if (header == MAP_FAILED) {
warn("%s: Unable to map OpRegion header", __func__);
close(memfd);
return (-1);
}
if (memcmp(header->sign, IGD_OPREGION_HEADER_SIGN,
sizeof(header->sign)) != 0) {
warnx("%s: Invalid OpRegion signature", __func__);
munmap(header, sizeof(*header));
close(memfd);
return (-1);
}
opregion->hpa = asls;
opregion->len = header->size * KB;
munmap(header, sizeof(header));
close(memfd);
return (0);
}
static int
gvt_d_init(struct pci_devinst *const pi, nvlist_t *const nvl __unused)
{
@ -177,6 +237,11 @@ gvt_d_init(struct pci_devinst *const pi, nvlist_t *const nvl __unused)
goto done;
}
if ((error = gvt_d_setup_opregion(pi)) != 0) {
warnx("%s: Unable to setup OpRegion", __func__);
goto done;
}
done:
return (error);
}