diff options
| author |   Jacob Pan <jacob.jun.pan@linux.intel.com> | 2020-01-02 08:18:03 +0800 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2020-01-07 14:05:57 +0100 |
| commit | ff3dc6521f78132eaaf62a842c3ece9060dcde26 (patch) | |
| tree | 63a98dad9f70909512ae377b651e83ff4ba3e631 /include/linux/intel-iommu.h | |
| parent | iommu/vt-d: Add Kconfig option to enable/disable scalable mode (diff) | |
| download | wireguard-linux-ff3dc6521f78132eaaf62a842c3ece9060dcde26.tar.xz wireguard-linux-ff3dc6521f78132eaaf62a842c3ece9060dcde26.zip | |
iommu/vt-d: Fix CPU and IOMMU SVM feature matching checks
Shared Virtual Memory(SVM) is based on a collective set of hardware
features detected at runtime. There are requirements for matching CPU
and IOMMU capabilities.
The current code checks CPU and IOMMU feature set for SVM support but
the result is never stored nor used. Therefore, SVM can still be used
even when these checks failed. The consequences can be:
1. CPU uses 5-level paging mode for virtual address of 57 bits, but
IOMMU can only support 4-level paging mode with 48 bits address for DMA.
2. 1GB page size is used by CPU but IOMMU does not support it. VT-d
unrecoverable faults may be generated.
The best solution to fix these problems is to prevent them in the first
place.
This patch consolidates code for checking PASID, CPU vs. IOMMU paging
mode compatibility, as well as provides specific error messages for
each failed checks. On sane hardware configurations, these error message
shall never appear in kernel log.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/intel-iommu.h')
| -rw-r--r-- | include/linux/intel-iommu.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 6d8bf4bdf240..aaece25c055f 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -435,6 +435,7 @@ enum { #define VTD_FLAG_TRANS_PRE_ENABLED (1 << 0) #define VTD_FLAG_IRQ_REMAP_PRE_ENABLED (1 << 1) +#define VTD_FLAG_SVM_CAPABLE (1 << 2) extern int intel_iommu_sm; @@ -658,7 +659,7 @@ void iommu_flush_write_buffer(struct intel_iommu *iommu); int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct device *dev); #ifdef CONFIG_INTEL_IOMMU_SVM -int intel_svm_init(struct intel_iommu *iommu); +extern void intel_svm_check(struct intel_iommu *iommu); extern int intel_svm_enable_prq(struct intel_iommu *iommu); extern int intel_svm_finish_prq(struct intel_iommu *iommu); @@ -686,6 +687,8 @@ struct intel_svm { }; extern struct intel_iommu *intel_svm_device_to_iommu(struct device *dev); +#else +static inline void intel_svm_check(struct intel_iommu *iommu) {} #endif #ifdef CONFIG_INTEL_IOMMU_DEBUGFS |