linux-kernel - [PATCH 09/11] x86/amd-iommu: Make amd_iommu_iova_to

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Date:	Thu, 28 Jan 2010 12:38:00 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	David Woodhouse <dwmw2@...radead.org>
CC:	kvm@...r.kernel.org, iommu@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 09/11] x86/amd-iommu: Make amd_iommu_iova_to_phys aware of multiple page sizes

This patch extends the amd_iommu_iova_to_phys() function to
handle different page sizes correctly. It doesn't use
fetch_pte() anymore because we don't know (or care about)
the page_size used for mapping the given iova.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/amd_iommu.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 503d312..52e44af 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -2556,17 +2556,22 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
 					  unsigned long iova)
 {
 	struct protection_domain *domain = dom->priv;
-	unsigned long offset = iova & ~PAGE_MASK;
+	unsigned long offset_mask;
 	phys_addr_t paddr;
-	u64 *pte;
+	u64 *pte, __pte;
 
 	pte = fetch_pte(domain, iova);
 
 	if (!pte || !IOMMU_PTE_PRESENT(*pte))
 		return 0;
 
-	paddr  = *pte & IOMMU_PAGE_MASK;
-	paddr |= offset;
+	if (PM_PTE_LEVEL(*pte) == 0)
+		offset_mask = PAGE_SIZE - 1;
+	else
+		offset_mask = PTE_PAGE_SIZE(*pte) - 1;
+
+	__pte = *pte & PM_ADDR_MASK;
+	paddr = (__pte & ~offset_mask) | (iova & offset_mask);
 
 	return paddr;
 }
-- 
1.6.6


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