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bhyve: protect MMIO mapped BDSM register

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The Windows graphics driver reads the value of the BDSM register from MMIO
space. This value makes no sense in our virtual environment because it's a host
address. Therefore, we have to trap and emulate it.

Reviewed by:		jhb
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D45342
This commit is contained in:
Corvin Köhne 2024-01-08 15:05:56 +01:00
parent 6dda2653bd
commit 6374c45fba
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GPG key ID: D854DA56315E026A
1 changed files with 45 additions and 0 deletions
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45
usr.sbin/bhyve/amd64/pci_gvt-d.c
View file

@ -39,10 +39,47 @@
#define PCIM_BDSM_GSM_ALIGNMENT \
0x00100000 /* Graphics Stolen Memory is 1 MB aligned */
#define BDSM_GEN11_MMIO_ADDRESS 0x1080C0
#define GVT_D_MAP_GSM 0
#define GVT_D_MAP_OPREGION 1
#define GVT_D_MAP_VBT 2
static uint64_t
gvt_d_dsmbase_read(struct pci_devinst *pi, int baridx __unused, uint64_t offset,
int size)
{
switch (size) {
case 1:
return (pci_get_cfgdata8(pi, PCIR_BDSM_GEN11 + offset));
case 2:
return (pci_get_cfgdata16(pi, PCIR_BDSM_GEN11 + offset));
case 4:
return (pci_get_cfgdata32(pi, PCIR_BDSM_GEN11 + offset));
default:
return (UINT64_MAX);
}
}
static void
gvt_d_dsmbase_write(struct pci_devinst *pi, int baridx __unused,
uint64_t offset, int size, uint64_t val)
{
switch (size) {
case 1:
pci_set_cfgdata8(pi, PCIR_BDSM_GEN11 + offset, val);
break;
case 2:
pci_set_cfgdata16(pi, PCIR_BDSM_GEN11 + offset, val);
break;
case 4:
pci_set_cfgdata32(pi, PCIR_BDSM_GEN11 + offset, val);
break;
default:
break;
}
}
static int
set_bdsm_gen3(struct pci_devinst *const pi, vm_paddr_t bdsm_gpa)
{
@ -85,6 +122,14 @@ set_bdsm_gen11(struct pci_devinst *const pi, vm_paddr_t bdsm_gpa)
return (error);
}
/* Protect the BDSM register in MMIO space. */
error = passthru_set_bar_handler(sc, 0, BDSM_GEN11_MMIO_ADDRESS, sizeof(uint64_t),
gvt_d_dsmbase_read, gvt_d_dsmbase_write);
if (error) {
warnx("%s: Failed to setup handler for BDSM mirror!\n", __func__);
return (error);
}
return (0);
}