diff options
| author | Jan Beulich <JBeulich@suse.com> | 2015-06-08 14:11:51 +0100 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2015-06-23 16:18:29 +0000 |
| commit | 69976894c1d91c4b0c985fa05936cb6b8d01382b (patch) | |
| tree | e53283fc6eac9b0746a819e3867228681d90a535 /hw/xen/xen_pt.c | |
| parent | 950fe0aa3f55ad6bb135fc9cde9ebf4df05f62fc (diff) | |
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 <stefano.stabellini@eu.citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Diffstat (limited to 'hw/xen/xen_pt.c')
| -rw-r--r-- | hw/xen/xen_pt.c | 16 |
1 files changed, 12 insertions, 4 deletions
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 */ |