@@ -482,14 +482,11 @@ static uint32_t assigned_dev_pci_read_config(PCIDevice *d, uint32_t address,
/*
* Catch access to
* - vendor & device ID
- * - command register (if emulation needed)
* - base address registers
* - ROM base address & capability pointer
* - interrupt line & pin
*/
if (ranges_overlap(address, len, PCI_VENDOR_ID, 4) ||
- (pci_dev->need_emulate_cmd &&
- ranges_overlap(address, len, PCI_COMMAND, 2)) ||
ranges_overlap(address, len, PCI_BASE_ADDRESS_0, 24) ||
ranges_overlap(address, len, PCI_ROM_ADDRESS, 5) ||
ranges_overlap(address, len, PCI_INTERRUPT_LINE, 2)) {
@@ -521,6 +518,11 @@ do_log:
DEBUG("(%x.%x): address=%04x val=0x%08x len=%d\n",
(d->devfn >> 3) & 0x1F, (d->devfn & 0x7), address, val, len);
+ if (pci_dev->need_emulate_cmd) {
+ val = merge_bits(val, pci_default_read_config(d, address, len),
+ address, len, PCI_COMMAND, 0xffff);
+ }
+
if (!pci_dev->cap.available) {
/* kill the special capabilities */
if (address == PCI_COMMAND && len == 4) {
If we emulate the command register, we must only read its content from the shadow config space. For dword read of both PCI_COMMAND and PCI_STATUS, at least the latter must be read from the device. For simplicity reasons and as the code path is not considered performance critical for the affected SRIOV devices, the fix performes device access to the command word unconditionally, even if emulation is enabled and only that word is read. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> --- hw/device-assignment.c | 8 +++++--- 1 files changed, 5 insertions(+), 3 deletions(-)