From 80a506b8fdcfa868bb53eb740f928217d0966fc1 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Tue, 27 Jul 2010 17:14:24 +0200 Subject: [PATCH] x86/amd-iommu: Export cache-coherency capability This patch exports the capability of the AMD IOMMU to force cache coherency of DMA transactions through the IOMMU-API. This is required to disable some nasty hacks in KVM when this capability is not available. Signed-off-by: Joerg Roedel --- arch/x86/kernel/amd_iommu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 29dd3b9f2f0..fa044e1e30a 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -2572,6 +2572,11 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, static int amd_iommu_domain_has_cap(struct iommu_domain *domain, unsigned long cap) { + switch (cap) { + case IOMMU_CAP_CACHE_COHERENCY: + return 1; + } + return 0; } -- 2.11.4.GIT