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From: Tianyu Lan <ltykernel@gmail.com>
To: kys@microsoft.com, haiyangz@microsoft.com,
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Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org,
	linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-scsi@vger.kernel.org, netdev@vger.kernel.org,
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Subject: [PATCH V2 11/14] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM
Date: Wed,  4 Aug 2021 14:45:07 -0400	[thread overview]
Message-ID: <20210804184513.512888-12-ltykernel@gmail.com> (raw)
In-Reply-To: <20210804184513.512888-1-ltykernel@gmail.com>

From: Tianyu Lan <Tianyu.Lan@microsoft.com>

In Isolation VM with AMD SEV, bounce buffer needs to be accessed via
extra address space which is above shared_gpa_boundary
(E.G 39 bit address line) reported by Hyper-V CPUID ISOLATION_CONFIG.
The access physical address will be original physical address +
shared_gpa_boundary. The shared_gpa_boundary in the AMD SEV SNP
spec is called virtual top of memory(vTOM). Memory addresses below
vTOM are automatically treated as private while memory above
vTOM is treated as shared.

Use dma_map_decrypted() in the swiotlb code, store remap address returned
and use the remap address to copy data from/to swiotlb bounce buffer.

Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
Change since v1:
       * Make swiotlb_init_io_tlb_mem() return error code and return
         error when dma_map_decrypted() fails.

Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
 include/linux/swiotlb.h |  4 ++++
 kernel/dma/swiotlb.c    | 32 ++++++++++++++++++++++++--------
 2 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index f507e3eacbea..584560ecaa8e 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -72,6 +72,9 @@ extern enum swiotlb_force swiotlb_force;
  * @end:	The end address of the swiotlb memory pool. Used to do a quick
  *		range check to see if the memory was in fact allocated by this
  *		API.
+ * @vaddr:	The vaddr of the swiotlb memory pool. The swiotlb
+ *		memory pool may be remapped in the memory encrypted case and store
+ *		virtual address for bounce buffer operation.
  * @nslabs:	The number of IO TLB blocks (in groups of 64) between @start and
  *		@end. For default swiotlb, this is command line adjustable via
  *		setup_io_tlb_npages.
@@ -89,6 +92,7 @@ extern enum swiotlb_force swiotlb_force;
 struct io_tlb_mem {
 	phys_addr_t start;
 	phys_addr_t end;
+	void *vaddr;
 	unsigned long nslabs;
 	unsigned long used;
 	unsigned int index;
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 1fa81c096c1d..29b6d888ef3b 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -176,7 +176,7 @@ void __init swiotlb_update_mem_attributes(void)
 	memset(vaddr, 0, bytes);
 }
 
-static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
+static int swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
 				    unsigned long nslabs, bool late_alloc)
 {
 	void *vaddr = phys_to_virt(start);
@@ -194,14 +194,21 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
 		mem->slots[i].alloc_size = 0;
 	}
 
-	set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
-	memset(vaddr, 0, bytes);
+	mem->vaddr = dma_map_decrypted(vaddr, bytes);
+	if (!mem->vaddr) {
+		pr_err("Failed to decrypt memory.\n");
+		return -ENOMEM;
+	}
+
+	memset(mem->vaddr, 0, bytes);
+	return 0;
 }
 
 int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
 {
 	struct io_tlb_mem *mem;
 	size_t alloc_size;
+	int ret;
 
 	if (swiotlb_force == SWIOTLB_NO_FORCE)
 		return 0;
@@ -216,7 +223,11 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
 		panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
 		      __func__, alloc_size, PAGE_SIZE);
 
-	swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false);
+	ret = swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false);
+	if (ret) {
+		memblock_free(__pa(mem), alloc_size);
+		return ret;
+	}
 
 	io_tlb_default_mem = mem;
 	if (verbose)
@@ -304,6 +315,8 @@ int
 swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
 {
 	struct io_tlb_mem *mem;
+	int size = get_order(struct_size(mem, slots, nslabs));
+	int ret;
 
 	if (swiotlb_force == SWIOTLB_NO_FORCE)
 		return 0;
@@ -312,12 +325,15 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
 	if (WARN_ON_ONCE(io_tlb_default_mem))
 		return -ENOMEM;
 
-	mem = (void *)__get_free_pages(GFP_KERNEL,
-		get_order(struct_size(mem, slots, nslabs)));
+	mem = (void *)__get_free_pages(GFP_KERNEL, size);
 	if (!mem)
 		return -ENOMEM;
 
-	swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true);
+	ret = swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true);
+	if (ret) {
+		free_pages((unsigned long)mem, size);
+		return ret;
+	}
 
 	io_tlb_default_mem = mem;
 	swiotlb_print_info();
@@ -360,7 +376,7 @@ static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size
 	phys_addr_t orig_addr = mem->slots[index].orig_addr;
 	size_t alloc_size = mem->slots[index].alloc_size;
 	unsigned long pfn = PFN_DOWN(orig_addr);
-	unsigned char *vaddr = phys_to_virt(tlb_addr);
+	unsigned char *vaddr = mem->vaddr + tlb_addr - mem->start;
 	unsigned int tlb_offset;
 
 	if (orig_addr == INVALID_PHYS_ADDR)
-- 
2.25.1


  parent reply	other threads:[~2021-08-04 18:46 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04 18:44 [PATCH V2 00/14] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-08-04 18:44 ` [PATCH V2 01/14] x86/HV: Initialize GHCB page in Isolation VM Tianyu Lan
2021-08-04 18:44 ` [PATCH V2 02/14] x86/HV: Initialize shared memory boundary in the " Tianyu Lan
2021-08-04 18:44 ` [PATCH V2 03/14] x86/set_memory: Add x86_set_memory_enc static call support Tianyu Lan
2021-08-04 19:27   ` Dave Hansen
2021-08-05 14:05     ` Tianyu Lan
2021-08-05 14:11       ` Peter Zijlstra
2021-08-05 14:23       ` Peter Zijlstra
2021-08-05 14:29         ` Dave Hansen
2021-08-05 15:51           ` Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 04/14] x86/HV: Add new hvcall guest address host visibility support Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 05/14] HV: Mark vmbus ring buffer visible to host in Isolation VM Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 06/14] HV: Add Write/Read MSR registers via ghcb page Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 07/14] HV: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 08/14] HV/Vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 09/14] HV/Vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 10/14] DMA: Add dma_map_decrypted/dma_unmap_encrypted() function Tianyu Lan
2021-08-05 15:56   ` Tianyu Lan
2021-08-04 18:45 ` Tianyu Lan [this message]
2021-08-05 16:01   ` [PATCH V2 11/14] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 12/14] HV/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 13/14] HV/Netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-08-04 18:45 ` [PATCH V2 14/14] HV/Storvsc: Add Isolation VM support for storvsc driver Tianyu Lan

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