Commit 59103caa authored by Sohil Mehta's avatar Sohil Mehta Committed by Joerg Roedel
Browse files

iommu/vt-d: Add a check for 1GB page support 



Add a check to verify IOMMU 1GB page support. If the CPU supports 1GB
pages but the IOMMU does not support it then disable SVM by not
allocating PASID tables.

Signed-off-by: default avatarSohil Mehta <sohil.mehta@intel.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 5e3b4a15

drivers/iommu/intel-svm.c

+4 −0
Original line number Diff line number Diff line
@@ -41,6 +41,10 @@ int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu) 
	struct page *pages;

	int order;



	if (cpu_feature_enabled(X86_FEATURE_GBPAGES) &&

			!cap_fl1gp_support(iommu->cap))

		return -EINVAL;



	/* Start at 2 because it's defined as 2^(1+PSS) */

	iommu->pasid_max = 2 << ecap_pss(iommu->ecap);

include/linux/intel-iommu.h

+1 −0
Original line number Diff line number Diff line
@@ -84,6 +84,7 @@ 
 * Decoding Capability Register

 */

#define cap_pi_support(c)	(((c) >> 59) & 1)

#define cap_fl1gp_support(c)	(((c) >> 56) & 1)

#define cap_read_drain(c)	(((c) >> 55) & 1)

#define cap_write_drain(c)	(((c) >> 54) & 1)

#define cap_max_amask_val(c)	(((c) >> 48) & 0x3f)

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