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bhyve: emulate graphics stolen memory register

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This register contains a host physical address. This address is
meaningless for the guest. We have to emulate it and set it to a valid
guest physical address.

Reviewed by:		markj
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D40060
This commit is contained in:
Corvin Köhne 2023-05-11 11:18:56 +02:00
parent 1bd361eea2
commit d9fa7c113d
No known key found for this signature in database
GPG Key ID: D854DA56315E026A
1 changed files with 9 additions and 1 deletions
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10
usr.sbin/bhyve/pci_gvt-d.c
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@ -23,6 +23,8 @@
#define PCI_VENDOR_INTEL 0x8086
#define PCIR_BDSM 0x5C /* Base of Data Stolen Memory register */
#define PCIM_BDSM_GSM_ALIGNMENT \
0x00100000 /* Graphics Stolen Memory is 1 MB aligned */
@ -96,6 +98,7 @@ gvt_d_setup_gsm(struct pci_devinst *const pi)
struct passthru_softc *sc;
struct passthru_mmio_mapping *gsm;
size_t sysctl_len;
uint32_t bdsm;
int error;
sc = pi->pi_arg;
@ -156,7 +159,12 @@ gvt_d_setup_gsm(struct pci_devinst *const pi)
"Warning: Unable to reuse host address of Graphics Stolen Memory. GPU passthrough might not work properly.");
}
return (0);
bdsm = read_config(passthru_get_sel(sc), PCIR_BDSM, 4);
pci_set_cfgdata32(pi, PCIR_BDSM,
gsm->gpa | (bdsm & (PCIM_BDSM_GSM_ALIGNMENT - 1)));
return (set_pcir_handler(sc, PCIR_BDSM, 4, passthru_cfgread_emulate,
passthru_cfgwrite_emulate));
}
static int