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| author | neel <neel@FreeBSD.org> | 2013-08-27 16:50:48 +0000 |
|---|---|---|
| committer | neel <neel@FreeBSD.org> | 2013-08-27 16:50:48 +0000 |
| commit | 236964c12d6e45e32a2c5c66673acc605ed2e73e (patch) | |
| tree | bef637b19b86c36f41997f48338b2ebffaa55666 /usr.sbin/bhyve | |
| parent | 99ab2bf08eb4c6c6bab630a6a655ca024838e010 (diff) | |
| download | FreeBSD-src-236964c12d6e45e32a2c5c66673acc605ed2e73e.zip FreeBSD-src-236964c12d6e45e32a2c5c66673acc605ed2e73e.tar.gz | |
Allow single byte reads of the emulated MSI-X tables. This is not required
by the PCI specification but needed to dump MMIO space from "ddb" in the
guest.
Diffstat (limited to 'usr.sbin/bhyve')
| -rw-r--r-- | usr.sbin/bhyve/pci_emul.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/usr.sbin/bhyve/pci_emul.c b/usr.sbin/bhyve/pci_emul.c index 005e8b1..626dfdf 100644 --- a/usr.sbin/bhyve/pci_emul.c +++ b/usr.sbin/bhyve/pci_emul.c @@ -245,8 +245,12 @@ pci_emul_msix_tread(struct pci_devinst *pi, uint64_t offset, int size) int tab_index; uint64_t retval = ~0; - /* support only 4 or 8 byte reads */ - if (size != 4 && size != 8) + /* + * The PCI standard only allows 4 and 8 byte accesses to the MSI-X + * table but we also allow 1 byte access to accomodate reads from + * ddb. + */ + if (size != 1 && size != 4 && size != 8) return (retval); msix_entry_offset = offset % MSIX_TABLE_ENTRY_SIZE; @@ -263,7 +267,9 @@ pci_emul_msix_tread(struct pci_devinst *pi, uint64_t offset, int size) dest = (char *)(pi->pi_msix.table + tab_index); dest += msix_entry_offset; - if (size == 4) + if (size == 1) + retval = *((uint8_t *)dest); + else if (size == 4) retval = *((uint32_t *)dest); else retval = *((uint64_t *)dest); |
