Author: grehan
Date: Mon Jul 1 20:05:43 2013
New Revision: 252475
URL: http://svnweb.freebsd.org/changeset/base/252475
Log:
Ignore guest PAT settings by default in EPT mappings.
From experimentation, other hypervisors also do this.
Diagnosed by: tycho nightingale at pluribusnetworks com
Reviewed by: neel
Modified:
head/sys/amd64/vmm/intel/ept.c
Modified: head/sys/amd64/vmm/intel/ept.c
==============================================================================
--- head/sys/amd64/vmm/intel/ept.c Mon Jul 1 19:58:13 2013
(r252474)
+++ head/sys/amd64/vmm/intel/ept.c Mon Jul 1 20:05:43 2013
(r252475)
@@ -77,6 +77,11 @@ MALLOC_DECLARE(M_VMX);
static uint64_t page_sizes_mask;
+/*
+ * Set this to 1 to have the EPT tables respect the guest PAT settings
+ */
+static int ept_pat_passthru;
+
int
ept_init(void)
{
@@ -226,10 +231,13 @@ ept_create_mapping(uint64_t *ptp, vm_pad
ptp[ptpindex] |= EPT_PG_EX;
/*
- * XXX should we enforce this memory type by setting the
- * ignore PAT bit to 1.
+ * By default the PAT type is ignored - this appears to
+ * be how other hypervisors handle EPT. Allow this to be
+ * overridden.
*/
ptp[ptpindex] |= EPT_PG_MEMORY_TYPE(attr);
+ if (!ept_pat_passthru)
+ ptp[ptpindex] |= EPT_PG_IGNORE_PAT;
if (nlevels > 0)
ptp[ptpindex] |= EPT_PG_SUPERPAGE;
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