From: Phil Dennis-Jordan Date: Fri, 27 Dec 2024 12:13:33 +0000 (+0100) Subject: hw/usb/hcd-xhci-pci: Use event ring 0 if mapping unsupported X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ef82ab692424c7fb42c3aeb6b65db68eade6213a;p=qemu.git hw/usb/hcd-xhci-pci: Use event ring 0 if mapping unsupported The XHCI specification, section 4.17.1 specifies that "If the Number of Interrupters (MaxIntrs) field is greater than 1, then Interrupter Mapping shall be supported." and "If Interrupter Mapping is not supported, the Interrupter Target field shall be ignored by the xHC and all Events targeted at Interrupter 0." QEMU's XHCI device has so far not specially addressed this case, so we add a check to xhci_event() to redirect to event ring and interrupt 0 if mapping is disabled. Signed-off-by: Phil Dennis-Jordan Reviewed-by: Philippe Mathieu-Daudé Message-ID: <20241227121336.25838-4-phil@philjordan.eu> Signed-off-by: Philippe Mathieu-Daudé --- diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c index 7dc0994c89..00d5bc3779 100644 --- a/hw/usb/hcd-xhci.c +++ b/hw/usb/hcd-xhci.c @@ -644,6 +644,10 @@ static void xhci_event(XHCIState *xhci, XHCIEvent *event, int v) dma_addr_t erdp; unsigned int dp_idx; + if (xhci->numintrs == 1) { + v = 0; + } + if (v >= xhci->numintrs) { DPRINTF("intr nr out of range (%d >= %d)\n", v, xhci->numintrs); return;