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Fix a bug in the passthru implementation where it would assume that all

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devices are MSI-X capable. This in turn would lead it to treat bar 0 as
the MSI-X table bar even if the underlying device did not support MSI-X.

Fix this by providing an API to query the MSI-X table index of the emulated
device. If the underlying device does not support MSI-X then this API will
return -1.

Obtained from:	NetApp
This commit is contained in:
Neel Natu 2013-02-01 02:41:47 +00:00
parent 07044a96d8
commit aa12663f49
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=246190
4 changed files with 34 additions and 8 deletions
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20
usr.sbin/bhyve/pci_emul.c
View File

@ -254,6 +254,26 @@ pci_emul_msix_tread(struct pci_devinst *pi, uint64_t offset, int size)
return (retval);
}
int
pci_msix_table_bar(struct pci_devinst *pi)
{
if (pi->pi_msix.table != NULL)
return (pi->pi_msix.table_bar);
else
return (-1);
}
int
pci_msix_pba_bar(struct pci_devinst *pi)
{
if (pi->pi_msix.table != NULL)
return (pi->pi_msix.pba_bar);
else
return (-1);
}
static int
pci_emul_io_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
uint32_t *eax, void *arg)

2
usr.sbin/bhyve/pci_emul.h
View File

@ -169,6 +169,8 @@ void pci_lintr_deassert(struct pci_devinst *pi);
int pci_lintr_request(struct pci_devinst *pi, int ivec);
int pci_msi_enabled(struct pci_devinst *pi);
int pci_msix_enabled(struct pci_devinst *pi);
int pci_msix_table_bar(struct pci_devinst *pi);
int pci_msix_pba_bar(struct pci_devinst *pi);
int pci_msi_msgnum(struct pci_devinst *pi);
void pci_parse_slot(char *opt, int legacy);
void pci_populate_msicap(struct msicap *cap, int msgs, int nextptr);

12
usr.sbin/bhyve/pci_passthru.c
View File

@ -361,6 +361,8 @@ init_msix_table(struct vmctx *ctx, struct passthru_softc *sc, uint64_t base)
size_t len;
struct pci_devinst *pi = sc->psc_pi;
assert(pci_msix_table_bar(pi) >= 0 && pci_msix_pba_bar(pi) >= 0);
/*
* If the MSI-X table BAR maps memory intended for
* other uses, it is at least assured that the table
@ -370,7 +372,9 @@ init_msix_table(struct vmctx *ctx, struct passthru_softc *sc, uint64_t base)
if (pi->pi_msix.pba_bar == pi->pi_msix.table_bar &&
((pi->pi_msix.pba_offset - pi->pi_msix.table_offset) < 4096)) {
/* Need to also emulate the PBA, not supported yet */
printf("Unsupported MSI-X table and PBA in same page\n");
printf("Unsupported MSI-X configuration: %d/%d/%d\n",
sc->psc_sel.pc_bus, sc->psc_sel.pc_dev,
sc->psc_sel.pc_func);
return (-1);
}
@ -447,7 +451,7 @@ cfginitbar(struct vmctx *ctx, struct passthru_softc *sc)
return (-1);
/* The MSI-X table needs special handling */
if (i == pi->pi_msix.table_bar) {
if (i == pci_msix_table_bar(pi)) {
error = init_msix_table(ctx, sc, base);
if (error)
return (-1);
@ -688,7 +692,7 @@ passthru_write(struct vmctx *ctx, int vcpu, struct pci_devinst *pi, int baridx,
sc = pi->pi_arg;
if (pi->pi_msix.table_bar == baridx) {
if (baridx == pci_msix_table_bar(pi)) {
msix_table_write(ctx, vcpu, sc, offset, size, value);
} else {
assert(pi->pi_bar[baridx].type == PCIBAR_IO);
@ -712,7 +716,7 @@ passthru_read(struct vmctx *ctx, int vcpu, struct pci_devinst *pi, int baridx,
sc = pi->pi_arg;
if (pi->pi_msix.table_bar == baridx) {
if (baridx == pci_msix_table_bar(pi)) {
val = msix_table_read(sc, offset, size);
} else {
assert(pi->pi_bar[baridx].type == PCIBAR_IO);

8
usr.sbin/bhyve/pci_virtio_net.c
View File

@ -685,8 +685,8 @@ pci_vtnet_write(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
void *ptr;
if (use_msix) {
if (baridx == pi->pi_msix.table_bar ||
baridx == pi->pi_msix.pba_bar) {
if (baridx == pci_msix_table_bar(pi) ||
baridx == pci_msix_pba_bar(pi)) {
pci_emul_msix_twrite(pi, offset, size, value);
return;
}
@ -781,8 +781,8 @@ pci_vtnet_read(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
uint64_t value;
if (use_msix) {
if (baridx == pi->pi_msix.table_bar ||
baridx == pi->pi_msix.pba_bar) {
if (baridx == pci_msix_table_bar(pi) ||
baridx == pci_msix_pba_bar(pi)) {
return (pci_emul_msix_tread(pi, offset, size));
}
}