xen/pt: mark all PCIe capability bits read-only

xen_pt_emu_reg_pcie[]'s PCI_EXP_DEVCAP needs to cover all bits as read-
only to avoid unintended write-back (just a precaution, the field ought
to be read-only in hardware).

This is a preparatory patch for XSA-131.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

diff --git a/hw/pass-through.c b/hw/pass-through.c
index 139c3f54399d2fb4f6b17c315394cb2ec6c2f016..5d0dd394ad489bd141f566a6631d81d1e32e511d 100644 (file)
--- a/hw/pass-through.c
+++ b/hw/pass-through.c
@@ -577,7 +577,7 @@ static struct pt_reg_info_tbl pt_emu_reg_pcie_tbl[] = {
         .offset     = PCI_EXP_DEVCAP,
         .size       = 4,
         .init_val   = 0x00000000,
-        .ro_mask    = 0x1FFCFFFF,
+        .ro_mask    = 0xFFFFFFFF,
         .emu_mask   = 0x10000000,
         .init       = pt_common_reg_init,
         .u.dw.read  = pt_long_reg_read,