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Ignore guest PAT settings by default in EPT mappings.

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From experimentation, other hypervisors also do this.

Diagnosed by:	tycho nightingale at pluribusnetworks com
Reviewed by:	neel
This commit is contained in:
Peter Grehan 2013-07-01 20:05:43 +00:00
parent 004f2eb2c1
commit e60f5d779e
1 changed files with 10 additions and 2 deletions
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12
sys/amd64/vmm/intel/ept.c
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@ -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_paddr_t gpa, vm_paddr_t hpa, size_t length,
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;