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iommu/vt-d: Enable 5-level paging mode in the PASID entry

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If the CPU has support for 5-level paging enabled and the IOMMU also
supports 5-level paging then enable the 5-level paging mode for first-
level translations - used when SVM is enabled.

Signed-off-by: Sohil Mehta <sohil.mehta@intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Sohil Mehta 2017-12-20 11:59:27 -08:00 committed by Joerg Roedel
parent f1ac10c24e
commit 2f13eb7c58
1 changed files with 13 additions and 2 deletions
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15
drivers/iommu/intel-svm.c
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@ -26,6 +26,10 @@
#include <linux/interrupt.h>
#include <asm/page.h>
#define PASID_ENTRY_P BIT_ULL(0)
#define PASID_ENTRY_FLPM_5LP BIT_ULL(9)
#define PASID_ENTRY_SRE BIT_ULL(11)
static irqreturn_t prq_event_thread(int irq, void *d);
struct pasid_entry {
@ -300,6 +304,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
struct intel_svm_dev *sdev;
struct intel_svm *svm = NULL;
struct mm_struct *mm = NULL;
u64 pasid_entry_val;
int pasid_max;
int ret;
@ -406,9 +411,15 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
kfree(sdev);
goto out;
}
iommu->pasid_table[svm->pasid].val = (u64)__pa(mm->pgd) | 1;
pasid_entry_val = (u64)__pa(mm->pgd) | PASID_ENTRY_P;
} else
iommu->pasid_table[svm->pasid].val = (u64)__pa(init_mm.pgd) | 1 | (1ULL << 11);
pasid_entry_val = (u64)__pa(init_mm.pgd) |
PASID_ENTRY_P | PASID_ENTRY_SRE;
if (cpu_feature_enabled(X86_FEATURE_LA57))
pasid_entry_val |= PASID_ENTRY_FLPM_5LP;
iommu->pasid_table[svm->pasid].val = pasid_entry_val;
wmb();
/* In caching mode, we still have to flush with PASID 0 when
* a PASID table entry becomes present. Not entirely clear