Ignore length of resource for PCI ROM request

Shuo Liu · jren1 · commit 44b0ec04133c · 2018-05-15T17:19:35.000+08:00
Writing PCIR_BIOS is to get PCI ROM resource length. Ingore the request
as it's not support currently. Else, guest might get wrong information
about the PCI ROM resource.

Signed-off-by: Shuo Liu &lt;shuo.a.liu@intel.com&gt;
diff --git a/devicemodel/hw/pci/core.c b/devicemodel/hw/pci/core.c
@@ -1905,6 +1905,8 @@ pci_cfgrw(struct vmctx *ctx, int vcpu, int in, int bus, int slot, int func,
 			}
 			pci_set_cfgdata32(dev, coff, bar);
 
+		} else if (coff == PCIR_BIOS) {
+			/* ignore ROM BAR length request */
 		} else if (pci_emul_iscap(dev, coff)) {
 			pci_emul_capwrite(dev, coff, bytes, *eax);
 		} else if (coff >= PCIR_COMMAND && coff < PCIR_REVID) {

Original file line number	Diff line number	Diff line change
`@@ -1905,6 +1905,8 @@ pci_cfgrw(struct vmctx *ctx, int vcpu, int in, int bus, int slot, int func,`
`1905`	`1905`	`}`
`1906`	`1906`	`pci_set_cfgdata32(dev, coff, bar);`
`1907`	`1907`
	`1908`	`+ } else if (coff == PCIR_BIOS) {`
	`1909`	`+ /* ignore ROM BAR length request */`
`1908`	`1910`	`} else if (pci_emul_iscap(dev, coff)) {`
`1909`	`1911`	`pci_emul_capwrite(dev, coff, bytes, *eax);`
`1910`	`1912`	`} else if (coff >= PCIR_COMMAND && coff < PCIR_REVID) {`