Re: [Xen-devel] [Xen-staging] [xen staging] Revert "xen/arm: Allocate memory for dom0 from the bottom with the 1:1 Workaround"

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-04-03 at 16:33 +0000, patchbot@xxxxxxx wrote:
> commit 1be5c1947fd52f5faaf6b678a829d47b0ec88bfd
> Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
> AuthorDate: Wed Apr 2 13:03:36 2014 +0100
> Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
> CommitDate: Thu Apr 3 17:15:41 2014 +0100
> 
>     Revert "xen/arm: Allocate memory for dom0 from the bottom with the 1:1 
> Workaround

Julien has just noticed that this breaks boot on the Midway systems. The
obvious fix broken the boot on 64-bit instead so for now I've reverted
the revert and I'll look into this properly tomorrow.

The unrevert is below, I've already pushed it.

-----8<------------------

From d6ca80e03cc062c984401aefba5e277a9d9139a0 Mon Sep 17 00:00:00 2001
From: Ian Campbell <ian.campbell@xxxxxxxxxx>
Date: Thu, 3 Apr 2014 17:54:34 +0100
Subject: [PATCH] Revert "Revert "xen/arm: Allocate memory for dom0 from the
 bottom with the 1:1 Workaround""

This reverts commit 1be5c1947fd52f5faaf6b678a829d47b0ec88bfd, effectively
reinstating 6c21cb36e263de2db8716b477157a5b6cd531e1e.

Without this booting dom0 on systems with >4GB of RAM is broken because the
guest gets allocated a memory range which it cannot access.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index a0b73d2..502db84 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -69,12 +69,19 @@ static void allocate_memory_11(struct domain *d, struct 
kernel_info *kinfo)
 {
     paddr_t start;
     paddr_t size;
-    struct page_info *pg;
+    struct page_info *pg = NULL;
     unsigned int order = get_order_from_bytes(dom0_mem);
     int res;
     paddr_t spfn;
+    unsigned int bits;
+
+    for ( bits = PAGE_SHIFT + 1; bits < PADDR_BITS; bits++ )
+    {
+        pg = alloc_domheap_pages(d, order, MEMF_bits(bits));
+        if ( pg != NULL )
+            break;
+    }
 
-    pg = alloc_domheap_pages(d, order, 0);
     if ( !pg )
         panic("Failed to allocate contiguous memory for dom0");
 
-- 
1.7.10.4




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