linux-kernel - [RFC PATCH v1 14/18] iommu/amd: AMD IOMMU support for memory encryption

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Date:	Tue, 26 Apr 2016 17:58:24 -0500
From:	Tom Lendacky <thomas.lendacky@....com>
To:	<linux-arch@...r.kernel.org>, <linux-efi@...r.kernel.org>,
	<kvm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<kasan-dev@...glegroups.com>, <linux-mm@...ck.org>,
	<iommu@...ts.linux-foundation.org>
CC:	Radim Krčmář <rkrcmar@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Jonathan Corbet <corbet@....net>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Joerg Roedel <joro@...tes.org>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"Ingo Molnar" <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	"Alexander Potapenko" <glider@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Dmitry Vyukov" <dvyukov@...gle.com>
Subject: [RFC PATCH v1 14/18] iommu/amd: AMD IOMMU support for memory
 encryption

Add support to the AMD IOMMU driver to set the memory encryption mask if
memory encryption is enabled.

Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
---
 arch/x86/include/asm/mem_encrypt.h |    2 ++
 arch/x86/mm/mem_encrypt.c          |    5 +++++
 drivers/iommu/amd_iommu.c          |   10 ++++++++++
 3 files changed, 17 insertions(+)

diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
index d17d8cf..55163e4 100644
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -39,6 +39,8 @@ void __init sme_early_init(void);
 /* Architecture __weak replacement functions */
 void __init mem_encrypt_init(void);
 
+unsigned long amd_iommu_get_me_mask(void);
+
 unsigned long swiotlb_get_me_mask(void);
 void swiotlb_set_mem_dec(void *vaddr, unsigned long size);
 
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 594dc65..6efceb8 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -179,6 +179,11 @@ void __init mem_encrypt_init(void)
 	swiotlb_clear_encryption();
 }
 
+unsigned long amd_iommu_get_me_mask(void)
+{
+	return sme_me_mask;
+}
+
 unsigned long swiotlb_get_me_mask(void)
 {
 	return sme_me_mask;
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 5efadad..5dc8f52 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -156,6 +156,15 @@ struct dma_ops_domain {
 	struct aperture_range *aperture[APERTURE_MAX_RANGES];
 };
 
+/*
+ * Support for memory encryption. If memory encryption is supported, then an
+ * override to this function will be provided.
+ */
+unsigned long __weak amd_iommu_get_me_mask(void)
+{
+	return 0;
+}
+
 /****************************************************************************
  *
  * Helper functions
@@ -2612,6 +2621,7 @@ static dma_addr_t __map_single(struct device *dev,
 	if (address == DMA_ERROR_CODE)
 		goto out;
 
+	paddr |= amd_iommu_get_me_mask();
 	start = address;
 	for (i = 0; i < pages; ++i) {
 		ret = dma_ops_domain_map(dma_dom, start, paddr, dir);