From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> [ Upstream commit 032c5ee40e9fc68ed650a3f86f23259376ec93fc ] The IOMMU VT-d implementation uses the first level for GPA->HPA translation by default. Although both the first level and the second level could handle the DMA translation, they're different in some way. For example, the second level translation has separate controls for the Access/Dirty page tracking. With the first level translation, there's no such control. On the other hand, the second level translation has the page-level control for forcing snoop, but the first level only has global control with pasid granularity. This uses the second level for GPA->HPA translation so that we can provide a consistent hardware interface for use cases like dirty page tracking for live migration. Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx> Link: https://lore.kernel.org/r/20210926114535.923263-1-baolu.lu@xxxxxxxxxxxxxxx Link: https://lore.kernel.org/r/20211014053839.727419-6-baolu.lu@xxxxxxxxxxxxxxx Signed-off-by: Joerg Roedel <jroedel@xxxxxxx> Stable-dep-of: 257ec2907419 ("iommu/vt-d: Allow to use flush-queue when first level is default") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/iommu/intel/iommu.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 6be0fb10cb8a9..850b0590c24a5 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -1917,9 +1917,18 @@ static void free_dmar_iommu(struct intel_iommu *iommu) * Check and return whether first level is used by default for * DMA translation. */ -static bool first_level_by_default(void) +static bool first_level_by_default(unsigned int type) { - return scalable_mode_support() && intel_cap_flts_sanity(); + /* Only SL is available in legacy mode */ + if (!scalable_mode_support()) + return false; + + /* Only level (either FL or SL) is available, just use it */ + if (intel_cap_flts_sanity() ^ intel_cap_slts_sanity()) + return intel_cap_flts_sanity(); + + /* Both levels are available, decide it based on domain type */ + return type != IOMMU_DOMAIN_UNMANAGED; } static struct dmar_domain *alloc_domain(unsigned int type) @@ -1932,7 +1941,7 @@ static struct dmar_domain *alloc_domain(unsigned int type) memset(domain, 0, sizeof(*domain)); domain->nid = NUMA_NO_NODE; - if (first_level_by_default()) + if (first_level_by_default(type)) domain->flags |= DOMAIN_FLAG_USE_FIRST_LEVEL; domain->has_iotlb_device = false; INIT_LIST_HEAD(&domain->devices); -- 2.39.2
