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From: Stefano Stabellini <sstabellini@kernel.org>
To: xen-devel@lists.xenproject.org
Cc: Stefano Stabellini <stefanos@xilinx.com>,
	julien.grall@arm.com, sstabellini@kernel.org,
	206497@studenti.unimore.it
Subject: [PATCH] xen/arm: skip first page when RAM starts at 0x0
Date: Thu, 25 Apr 2019 10:51:55 -0700	[thread overview]
Message-ID: <1556214715-22030-1-git-send-email-sstabellini@kernel.org> (raw)

Xen assumes that RAM starts at addresses greater than 0x0 in a few
places. The PDX code is one of them but there are more.

For now, skip the first page in memory when the start addess is 0x0.

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
---
 xen/arch/arm/bootfdt.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index 891b4b6..2ae4238 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -157,6 +157,13 @@ static void __init process_memory_node(const void *fdt, int node,
         device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
         if ( !size )
             continue;
+
+        /*
+         * Xen cannot deal with memory starting at 0x0. Burn the first
+         * page.
+         */
+        if ( start == 0 )
+            start += PAGE_SIZE;
         bootinfo.mem.bank[bootinfo.mem.nr_banks].start = start;
         bootinfo.mem.bank[bootinfo.mem.nr_banks].size = size;
         bootinfo.mem.nr_banks++;
-- 
1.9.1


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Xen-devel@lists.xenproject.org
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WARNING: multiple messages have this Message-ID (diff)
From: Stefano Stabellini <sstabellini@kernel.org>
To: xen-devel@lists.xenproject.org
Cc: Stefano Stabellini <stefanos@xilinx.com>,
	julien.grall@arm.com, sstabellini@kernel.org,
	206497@studenti.unimore.it
Subject: [Xen-devel] [PATCH] xen/arm: skip first page when RAM starts at 0x0
Date: Thu, 25 Apr 2019 10:51:55 -0700	[thread overview]
Message-ID: <1556214715-22030-1-git-send-email-sstabellini@kernel.org> (raw)
Message-ID: <20190425175155.1LHNNM6u-LYANroTHOunPRLIeGn6q2aMTLyAUCWNH-A@z> (raw)

Xen assumes that RAM starts at addresses greater than 0x0 in a few
places. The PDX code is one of them but there are more.

For now, skip the first page in memory when the start addess is 0x0.

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
---
 xen/arch/arm/bootfdt.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index 891b4b6..2ae4238 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -157,6 +157,13 @@ static void __init process_memory_node(const void *fdt, int node,
         device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
         if ( !size )
             continue;
+
+        /*
+         * Xen cannot deal with memory starting at 0x0. Burn the first
+         * page.
+         */
+        if ( start == 0 )
+            start += PAGE_SIZE;
         bootinfo.mem.bank[bootinfo.mem.nr_banks].start = start;
         bootinfo.mem.bank[bootinfo.mem.nr_banks].size = size;
         bootinfo.mem.nr_banks++;
-- 
1.9.1


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel

             reply	other threads:[~2019-04-25 17:51 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-25 17:51 Stefano Stabellini [this message]
2019-04-25 17:51 ` [Xen-devel] [PATCH] xen/arm: skip first page when RAM starts at 0x0 Stefano Stabellini
2019-04-25 21:27 ` Julien Grall
2019-04-25 21:27   ` [Xen-devel] " Julien Grall
2019-04-26  9:12   ` Jan Beulich
2019-04-26  9:12     ` [Xen-devel] " Jan Beulich
2019-04-26  9:19     ` Julien Grall
2019-04-26  9:19       ` [Xen-devel] " Julien Grall
2019-04-26  9:42       ` Jan Beulich
2019-04-26  9:42         ` [Xen-devel] " Jan Beulich
2019-04-26 15:38         ` Julien Grall
2019-04-26 15:38           ` [Xen-devel] " Julien Grall
2019-04-26 15:48           ` Jan Beulich
2019-04-26 15:48             ` [Xen-devel] " Jan Beulich
2019-04-26 21:31             ` Julien Grall
2019-04-26 21:31               ` [Xen-devel] " Julien Grall
2019-04-26 23:47               ` Stefano Stabellini
2019-04-26 23:47                 ` [Xen-devel] " Stefano Stabellini
2019-04-27 19:43                 ` Julien Grall
2019-04-27 19:43                   ` [Xen-devel] " Julien Grall
2019-04-29  7:15                 ` Jan Beulich
2019-04-29  7:15                   ` [Xen-devel] " Jan Beulich
2019-04-29 15:54                   ` Julien Grall
2019-04-29 15:54                     ` [Xen-devel] " Julien Grall
2019-04-29 16:07                     ` Jan Beulich
2019-04-29 16:07                       ` [Xen-devel] " Jan Beulich
2019-04-29 17:51                       ` Stefano Stabellini
2019-04-29 17:51                         ` [Xen-devel] " Stefano Stabellini
2019-05-01 22:44                         ` Stefano Stabellini
2019-05-01 22:44                           ` [Xen-devel] " Stefano Stabellini
2019-05-02  7:30                           ` Jan Beulich
2019-05-02  7:30                             ` [Xen-devel] " Jan Beulich
2019-05-02  9:02                             ` Julien Grall
2019-05-02  9:02                               ` [Xen-devel] " Julien Grall
2019-05-02  9:20                               ` Jan Beulich
2019-05-02  9:20                                 ` [Xen-devel] " Jan Beulich
2019-05-02 22:25                                 ` Stefano Stabellini
2019-05-02 22:25                                   ` [Xen-devel] " Stefano Stabellini
2019-05-03  7:26                                   ` Jan Beulich
2019-05-03  7:26                                     ` [Xen-devel] " Jan Beulich
2019-05-03 20:16                                     ` Stefano Stabellini
2019-05-03 20:16                                       ` [Xen-devel] " Stefano Stabellini
2019-04-29  7:07               ` Jan Beulich
2019-04-29  7:07                 ` [Xen-devel] " Jan Beulich

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