Re: [Xen-devel] Re: fs-backend on -unstable

[Boris Derzhavets <bderzhavets@xxxxxxxxx>]

Patch applied to /usr/src/xen-unstable.hg/tools/ioemu-dir/hw/ide.c.

# cd /usr/src/xen-unstable.hg
# find . -name ide.c -print
./stubdom/ioemu/hw/ide.c
./tools/ioemu-remote/hw/ide.c
# ls -l ./stubdom/ioemu/hw/ide.c
lrwxrwxrwx 1 root src 50 2009-03-26 07:45 ./stubdom/ioemu/hw/ide.c -> /usr/src/xen-unstable.hg//tools/ioemu-dir/hw/ide.c

# make tools
# make install-tools
# cd stubdom # there is symlink to ./tools/ioemu-remote/ide.c
# make
# make install

System restarted (just in case).
No luck (just same picture as before) under Xen Unstable & Suse's 2.6.27-5

Boris.

--- On Thu, 3/26/09, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> wrote:

From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: fs-backend on -unstable
To: "Jody Belka" <lists-xen@xxxxxxxx>
Cc: "Samuel Thibault" <samuel.thibault@xxxxxxxxxxxx>, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx>, "Xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Date: Thursday, March 26, 2009, 6:21 AM

Jody Belka wrote:

> Now, the stub domain isn't actually working for me anyway, even on
> non-pvops0, but it is able to talk to the fs-backend at least. To show
> what that looks like, I've attached a couple of emails I sent
off-list.



There are some known issues that affect stubdoms at the moment, since
they involve some changes made on qemu upstream I am trying to find a
solution there.

However if you want to test the latest stubdoms you can try this patch,
it works for me.

---

diff --git a/hw/ide.c b/hw/ide.c
index 7031ba1..a97c78b
 100644
--- a/hw/ide.c
+++ b/hw/ide.c
@@ -1056,10 +1056,11 @@ static int dma_buf_prepare(BMDMAState *bm, int
is_write)
         uint32_t addr;
         uint32_t size;
     } prd;
-    int l, len;
+    int l, len, n;
     void *mem;
     target_phys_addr_t l1;
 
+    n = s->nsector <= IDE_DMA_BUF_SECTORS ? s->nsector :
IDE_DMA_BUF_SECTORS;
     qemu_iovec_init(&s->iovec, s->nsector / (TARGET_PAGE_SIZE/512) +
1);
     s->io_buffer_size = 0;
     for(;;) {
@@ -1082,6 +1083,13 @@ static int dma_buf_prepare(BMDMAState *bm, int is_write)
         l = bm->cur_prd_len;
         if (l > 0) {
             l1 = l;
+            if (l1 > IDE_DMA_BUF_SECTORS * 512)
+                l1 = IDE_DMA_BUF_SECTORS * 512;
+            if (s->io_buffer_size + l1 > IDE_DMA_BUF_SECTORS * 512) {
+                l1 = IDE_DMA_BUF_SECTORS * 512 -
 s->io_buffer_size;
+                if (!l1)
+                    return s->io_buffer_size != 0;
+            }
             mem = cpu_physical_memory_map(bm->cur_prd_addr, &l1,
is_write);
             if (!mem) {
                 break;
@@ -1263,6 +1271,8 @@ static void ide_read_dma_cb(void *opaque, int ret)
 
     /* launch next transfer */
     n = s->nsector;
+    if (n > IDE_DMA_BUF_SECTORS)
+        n = IDE_DMA_BUF_SECTORS;
     s->io_buffer_index = 0;
     s->io_buffer_size = n * 512;
     if (dma_buf_prepare(bm, 1) == 0)
@@ -1412,6 +1422,8 @@ static void ide_write_dma_cb(void *opaque, int ret)
     }
 
     n = s->nsector;
+    if (n > IDE_DMA_BUF_SECTORS)
+        n = IDE_DMA_BUF_SECTORS;
     s->io_buffer_size = n * 512;
     /* launch next transfer */
     if (dma_buf_prepare(bm, 0) ==
 0)

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