[PATCH] hw/xen_pt: Don't grant opregion permissions

[Grzegorz Uriasz <gorbak25@xxxxxxxxx>]

With the upstreaming of linux based stubdomains to xen, qemu can't
assume it runs inside dom0 - permission assignment must be moved to
libxl running in dom0. This xen patch:
https://lists.xenproject.org/archives/html/xen-devel/2020-06/msg00973.html
implements granting the required permissions to the stubdomain running
qemu. This patch removes granting opregion permissions in qemu - this
should be fine as when qemu is running inside dom0 the memory mapping will
be successfully created without first explicitly granting the permission.

Signed-off-by: Grzegorz Uriasz <gorbak25@xxxxxxxxx>
---
 hw/xen/xen_pt_graphics.c | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/hw/xen/xen_pt_graphics.c b/hw/xen/xen_pt_graphics.c
index 7d46e9c209..303674365b 100644
--- a/hw/xen/xen_pt_graphics.c
+++ b/hw/xen/xen_pt_graphics.c
@@ -283,19 +283,6 @@ void igd_write_opregion(XenPCIPassthroughState *s, 
uint32_t val)
     igd_guest_opregion = (unsigned long)(val & ~XEN_PCI_INTEL_OPREGION_MASK)
                             | (igd_host_opregion & 
XEN_PCI_INTEL_OPREGION_MASK);
 
-    ret = xc_domain_iomem_permission(xen_xc, xen_domid,
-            (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
-            XEN_PCI_INTEL_OPREGION_PAGES,
-            XEN_PCI_INTEL_OPREGION_ENABLE_ACCESSED);
-
-    if (ret) {
-        XEN_PT_ERR(&s->dev, "[%d]:Can't enable to access IGD host opregion:"
-                    " 0x%lx.\n", ret,
-                    (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT)),
-        igd_guest_opregion = 0;
-        return;
-    }
-
     ret = xc_domain_memory_mapping(xen_xc, xen_domid,
             (unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT),
             (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
-- 
2.27.0