diff options
| -rw-r--r-- | usr.sbin/bhyve/pci_emul.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/usr.sbin/bhyve/pci_emul.c b/usr.sbin/bhyve/pci_emul.c index a95f261..fe21cee 100644 --- a/usr.sbin/bhyve/pci_emul.c +++ b/usr.sbin/bhyve/pci_emul.c @@ -941,10 +941,19 @@ pci_emul_capwrite(struct pci_devinst *pi, int offset, int bytes, uint32_t val) assert(offset >= capoff); /* - * Capability ID and Next Capability Pointer are readonly + * Capability ID and Next Capability Pointer are readonly. + * However, some o/s's do 4-byte writes that include these. + * For this case, trim the write back to 2 bytes and adjust + * the data. */ - if (offset == capoff || offset == capoff + 1) - return; + if (offset == capoff || offset == capoff + 1) { + if (offset == capoff && bytes == 4) { + bytes = 2; + offset += 2; + val >>= 16; + } else + return; + } switch (capid) { case PCIY_MSI: |
