[Qemu-devel] [RFC PATCH 4/7] ide: IOMMU support

[Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>]

Memory accesses must go through the IOMMU layer.

Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
---
 hw/ide/core.c |   46 +++++++++++++++++++++++++++++++---------------
 1 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/hw/ide/core.c b/hw/ide/core.c
index 0b3b7c2..7f8f7df 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -26,6 +26,7 @@
 #include <hw/pc.h>
 #include <hw/pci.h>
 #include <hw/scsi.h>
+#include <hw/iommu.h>
 #include "qemu-timer.h"
 #include "sysemu.h"
 #include "dma.h"
@@ -433,7 +434,12 @@ static int dma_buf_prepare(BMDMAState *bm, int is_write)
         uint32_t addr;
         uint32_t size;
     } prd;
-    int l, len;
+    int l, len, err, io_len;
+    struct iommu *iommu;
+    DeviceState *dev;
+    target_phys_addr_t io_addr;
+
+    iommu = iommu_get(s->bus->qbus.parent, &dev);
 
     qemu_sglist_init(&s->sg, s->nsector / (IDE_PAGE_SIZE / 512) + 1);
     s->io_buffer_size = 0;
@@ -443,7 +449,7 @@ static int dma_buf_prepare(BMDMAState *bm, int is_write)
             if (bm->cur_prd_last ||
                 (bm->cur_addr - bm->addr) >= IDE_PAGE_SIZE)
                 return s->io_buffer_size != 0;
-            cpu_physical_memory_read(bm->cur_addr, (uint8_t *)&prd, 8);
+            err = iommu_read(iommu, dev, bm->cur_addr, (uint8_t *)&prd, 8);
             bm->cur_addr += 8;
             prd.addr = le32_to_cpu(prd.addr);
             prd.size = le32_to_cpu(prd.size);
@@ -455,11 +461,22 @@ static int dma_buf_prepare(BMDMAState *bm, int is_write)
             bm->cur_prd_last = (prd.size & 0x80000000);
         }
         l = bm->cur_prd_len;
-        if (l > 0) {
-            qemu_sglist_add(&s->sg, bm->cur_prd_addr, l);
-            bm->cur_prd_addr += l;
-            bm->cur_prd_len -= l;
-            s->io_buffer_size += l;
+        while (l > 0) {
+            /*
+             * In case translation / access checking fails no
+             * transfer happens but we pretend it went through.
+             */
+            err = iommu_translate(iommu, dev, bm->cur_prd_addr,
+                                  &io_addr, &io_len, !is_write);
+            if (!err) {
+                if (io_len > l)
+                    io_len = l;
+                qemu_sglist_add(&s->sg, io_addr, io_len);
+            }
+            bm->cur_prd_addr += io_len;
+            bm->cur_prd_len -= io_len;
+            s->io_buffer_size += io_len;
+            l -= io_len;
         }
     }
     return 1;
@@ -516,6 +533,10 @@ static int dma_buf_rw(BMDMAState *bm, int is_write)
         uint32_t size;
     } prd;
     int l, len;
+    struct iommu *iommu;
+    DeviceState *dev;
+
+    iommu = iommu_get(s->bus->qbus.parent, &dev);
 
     for(;;) {
         l = s->io_buffer_size - s->io_buffer_index;
@@ -526,7 +547,7 @@ static int dma_buf_rw(BMDMAState *bm, int is_write)
             if (bm->cur_prd_last ||
                 (bm->cur_addr - bm->addr) >= IDE_PAGE_SIZE)
                 return 0;
-            cpu_physical_memory_read(bm->cur_addr, (uint8_t *)&prd, 8);
+            iommu_read(iommu, dev, bm->cur_addr, (uint8_t *)&prd, 8);
             bm->cur_addr += 8;
             prd.addr = le32_to_cpu(prd.addr);
             prd.size = le32_to_cpu(prd.size);
@@ -540,13 +561,8 @@ static int dma_buf_rw(BMDMAState *bm, int is_write)
         if (l > bm->cur_prd_len)
             l = bm->cur_prd_len;
         if (l > 0) {
-            if (is_write) {
-                cpu_physical_memory_write(bm->cur_prd_addr,
-                                          s->io_buffer + s->io_buffer_index, l);
-            } else {
-                cpu_physical_memory_read(bm->cur_prd_addr,
-                                          s->io_buffer + s->io_buffer_index, l);
-            }
+            iommu_rw(iommu, dev, bm->cur_prd_addr,
+                     s->io_buffer + s->io_buffer_index, l, is_write);
             bm->cur_prd_addr += l;
             bm->cur_prd_len -= l;
             s->io_buffer_index += l;
-- 
1.7.1