From: Jan Beulich <jbeulich@suse.com>
Date: Tue, 2 Jun 2015 15:43:08 +0000 (+0000)
Subject: xen/pt: mark all PCIe capability bits read-only
X-Git-Tag: qemu-xen-4.4.3-rc1~5
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=8461481fd0ba47ab9bbb9ad947e60710b13899d6;p=qemu-upstream-4.4-testing.git

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/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c
index 65b3479ff..45ff34e45 100644
--- a/hw/xen/xen_pt_config_init.c
+++ b/hw/xen/xen_pt_config_init.c
@@ -873,7 +873,7 @@ static XenPTRegInfo xen_pt_emu_reg_pcie[] = {
         .offset     = PCI_EXP_DEVCAP,
         .size       = 4,
         .init_val   = 0x00000000,
-        .ro_mask    = 0x1FFCFFFF,
+        .ro_mask    = 0xFFFFFFFF,
         .emu_mask   = 0x10000000,
         .init       = xen_pt_common_reg_init,
         .u.dw.read  = xen_pt_long_reg_read,