Author: neel
Date: Tue Aug 20 06:46:40 2013
New Revision: 254549
URL: http://svnweb.freebsd.org/changeset/base/254549
Log:
Do not create superpage mappings in the iommu.
This is a workaround to hide the fact that we do not have any code to
demote a superpage mapping before we unmap a single page that is part
of the superpage.
Modified:
head/sys/amd64/vmm/intel/vtd.c
Modified: head/sys/amd64/vmm/intel/vtd.c
==============================================================================
--- head/sys/amd64/vmm/intel/vtd.c Tue Aug 20 06:20:05 2013
(r254548)
+++ head/sys/amd64/vmm/intel/vtd.c Tue Aug 20 06:46:40 2013
(r254549)
@@ -611,13 +611,30 @@ vtd_create_domain(vm_paddr_t maxaddr)
dom = malloc(sizeof(struct domain), M_VTD, M_ZERO | M_WAITOK);
dom->pt_levels = pt_levels;
dom->addrwidth = addrwidth;
- dom->spsmask = VTD_CAP_SPS(vtdmap->cap);
dom->id = domain_id();
dom->maxaddr = maxaddr;
dom->ptp = malloc(PAGE_SIZE, M_VTD, M_ZERO | M_WAITOK);
if ((uintptr_t)dom->ptp & PAGE_MASK)
panic("vtd_create_domain: ptp (%p) not page aligned", dom->ptp);
+#ifdef notyet
+ /*
+ * XXX superpage mappings for the iommu do not work correctly.
+ *
+ * By default all physical memory is mapped into the host_domain.
+ * When a VM is allocated wired memory the pages belonging to it
+ * are removed from the host_domain and added to the vm's domain.
+ *
+ * If the page being removed was mapped using a superpage mapping
+ * in the host_domain then we need to demote the mapping before
+ * removing the page.
+ *
+ * There is not any code to deal with the demotion at the moment
+ * so we disable superpage mappings altogether.
+ */
+ dom->spsmask = VTD_CAP_SPS(vtdmap->cap);
+#endif
+
SLIST_INSERT_HEAD(&domhead, dom, next);
return (dom);
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