Re: [PATCH] x86, efi: retry ExitBootServices() on failure

[joeyli <jlee-IBi9RG/b67k@public.gmane.org>]

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於 一，2013-06-17 於 11:17 +0100，Matt Fleming 提到：
> On Mon, 17 Jun, at 10:46:28AM, Jan Beulich wrote:
> > To me, all this looks like it is being done on phenomenological basis,
> > taking a particular build of a particular firmware implementation as
> > the reference. Imo we shouldn't change the code in this way. This
> > also applies to the fact that the step is being doubled rather than
> > e.g. tripled: With it ending up a "again" anyway (see below), what's
> > the point of avoiding one more of the iterations?
> > 
> > Generic considerations would result in the increment being at least
> > 3 * element size; twice the element size assumes that the allocator
> > would behave in certain ways (like returning the head or tail part of
> > a larger piece of memory).
>  
> I have no issue with changing the multiplier. But let's get
> clarification from Zach as to what exactly is going on here.
> 
> > I agree that there ought to be an upper limit. But a single retry here
> > again looks like a tailored solution to a particular observed (mis-)
> > behavior, rather than something resulting from general considerations.
> 
> What value would you suggest for the retry?
> 

Currently grub2 retry unlimited times like attached patch.

But, I also agree need have a upper limit.


Thanks a lot!
Joey Lee


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------------------------------------------------------------
revno: 4778
committer: Vladimir 'phcoder' Serbinenko <phcoder-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
branch nick: grub
timestamp: Tue 2013-03-26 11:34:56 +0100
message:
  	* grub-core/kern/efi/mm.c (grub_efi_finish_boot_services):
  	Try terminating EFI services several times due to quirks in some
  	implementations.
diff:
=== modified file 'ChangeLog'
--- ChangeLog	2013-03-26 10:29:52 +0000
+++ ChangeLog	2013-03-26 10:34:56 +0000
@@ -1,3 +1,9 @@
+2013-03-26  Vladimir Serbinenko  <phcoder-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+
+	* grub-core/kern/efi/mm.c (grub_efi_finish_boot_services):
+	Try terminating EFI services several times due to quirks in some
+	implementations.
+
 2013-03-26  Colin Watson  <cjwatson-GeWIH/nMZzLQT0dZR+AlfA@public.gmane.org>
 
 	* grub-core/commands/acpihalt.c (skip_ext_op): Add support for

=== modified file 'grub-core/kern/efi/mm.c'
--- grub-core/kern/efi/mm.c	2013-01-13 01:10:41 +0000
+++ grub-core/kern/efi/mm.c	2013-03-26 10:34:56 +0000
@@ -160,27 +160,41 @@
 			   apple, sizeof (apple)) == 0);
 #endif
 
-  if (grub_efi_get_memory_map (&finish_mmap_size, finish_mmap_buf, &finish_key,
-			       &finish_desc_size, &finish_desc_version) < 0)
-    return grub_error (GRUB_ERR_IO, "couldn't retrieve memory map");
-
-  if (outbuf && *outbuf_size < finish_mmap_size)
-    return grub_error (GRUB_ERR_IO, "memory map buffer is too small");
-
-  finish_mmap_buf = grub_malloc (finish_mmap_size);
-  if (!finish_mmap_buf)
-    return grub_errno;
-
-  if (grub_efi_get_memory_map (&finish_mmap_size, finish_mmap_buf, &finish_key,
-			       &finish_desc_size, &finish_desc_version) <= 0)
-    return grub_error (GRUB_ERR_IO, "couldn't retrieve memory map");
-
-  b = grub_efi_system_table->boot_services;
-  status = efi_call_2 (b->exit_boot_services, grub_efi_image_handle,
-		       finish_key);
-  if (status != GRUB_EFI_SUCCESS)
-    return grub_error (GRUB_ERR_IO, "couldn't terminate EFI services");
-
+  while (1)
+    {
+      if (grub_efi_get_memory_map (&finish_mmap_size, finish_mmap_buf, &finish_key,
+				   &finish_desc_size, &finish_desc_version) < 0)
+	return grub_error (GRUB_ERR_IO, "couldn't retrieve memory map");
+
+      if (outbuf && *outbuf_size < finish_mmap_size)
+	return grub_error (GRUB_ERR_IO, "memory map buffer is too small");
+
+      finish_mmap_buf = grub_malloc (finish_mmap_size);
+      if (!finish_mmap_buf)
+	return grub_errno;
+
+      if (grub_efi_get_memory_map (&finish_mmap_size, finish_mmap_buf, &finish_key,
+				   &finish_desc_size, &finish_desc_version) <= 0)
+	{
+	  grub_free (finish_mmap_buf);
+	  return grub_error (GRUB_ERR_IO, "couldn't retrieve memory map");
+	}
+
+      b = grub_efi_system_table->boot_services;
+      status = efi_call_2 (b->exit_boot_services, grub_efi_image_handle,
+			   finish_key);
+      if (status == GRUB_EFI_SUCCESS)
+	break;
+
+      if (status != GRUB_EFI_INVALID_PARAMETER)
+	{
+	  grub_free (finish_mmap_buf);
+	  return grub_error (GRUB_ERR_IO, "couldn't terminate EFI services");
+	}
+
+      grub_free (finish_mmap_buf);
+      grub_printf ("Trying to terminate EFI services again\n");
+    }
   grub_efi_is_finished = 1;
   if (outbuf_size)
     *outbuf_size = finish_mmap_size;