From 69976894c1d91c4b0c985fa05936cb6b8d01382b Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Mon, 8 Jun 2015 14:11:51 +0100 Subject: xen/pass-through: ROM BAR handling adjustments Expecting the ROM BAR to be written with an all ones value when sizing the region is wrong - the low bit has another meaning (enable/disable) and bits 1..10 are reserved. The PCI spec also mandates writing all ones to just the address portion of the register. Use suitable constants also for initializing the ROM BAR register field description. Signed-off-by: Stefano Stabellini Signed-off-by: Jan Beulich --- hw/xen/xen_pt.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) (limited to 'hw/xen/xen_pt.c') diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c index 8d47a4502c..7b8a31e4b7 100644 --- a/hw/xen/xen_pt.c +++ b/hw/xen/xen_pt.c @@ -249,10 +249,18 @@ static void xen_pt_pci_write_config(PCIDevice *d, uint32_t addr, /* check unused BAR register */ index = xen_pt_bar_offset_to_index(addr); - if ((index >= 0) && (val > 0 && val < XEN_PT_BAR_ALLF) && - (s->bases[index].bar_flag == XEN_PT_BAR_FLAG_UNUSED)) { - XEN_PT_WARN(d, "Guest attempt to set address to unused Base Address " - "Register. (addr: 0x%02x, len: %d)\n", addr, len); + if ((index >= 0) && (val != 0)) { + uint32_t chk = val; + + if (index == PCI_ROM_SLOT) + chk |= (uint32_t)~PCI_ROM_ADDRESS_MASK; + + if ((chk != XEN_PT_BAR_ALLF) && + (s->bases[index].bar_flag == XEN_PT_BAR_FLAG_UNUSED)) { + XEN_PT_WARN(d, "Guest attempt to set address to unused " + "Base Address Register. (addr: 0x%02x, len: %d)\n", + addr, len); + } } /* find register group entry */ -- cgit v1.2.3