44 lines
1.5 KiB
Diff
44 lines
1.5 KiB
Diff
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From 74f052de33cb14d7a1656079a53102a7cbbb6e75 Mon Sep 17 00:00:00 2001
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From: jiangdongxu <jiangdongxu1@huawei.com>
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Date: Fri, 11 Feb 2022 16:16:05 +0800
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Subject: [PATCH 2/6] seabios: do not give back high ram
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Oracle 6 and 7 series virtual machines will use the high ram returned by
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sebios. Since these high ram will not be initialized before kernel used,
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this will cause a system exception. This patch removes the logic for
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returning high ram, making the virtual machine will not use this part
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of the memory, thus avoiding this kernel bug.
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Signed-off-by: wangxin <wangxinxin.wang@huawei.com>
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Signed-off-by: Fangyi <eric.fangyi@huawei.com>
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Signed-off-by: jiangdongxu <jiangdongxu1@huawei.com>
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---
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roms/seabios/src/malloc.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/roms/seabios/src/malloc.c b/roms/seabios/src/malloc.c
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index 3733855caf..5827a6523a 100644
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--- a/roms/seabios/src/malloc.c
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+++ b/roms/seabios/src/malloc.c
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@@ -549,6 +549,9 @@ malloc_prepboot(void)
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dprintf(1, "Space available for UMB: %x-%x, %x-%x\n"
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, RomEnd, base, info->range_start, info->range_end);
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+ // We should not give back unused high ram, to support some special
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+ // guest OS, like oracle linux series.
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+#ifdef HIGH_MEM_BACK
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// Give back unused high ram.
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info = alloc_find_lowest(&ZoneHigh);
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if (info) {
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@@ -556,6 +559,7 @@ malloc_prepboot(void)
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e820_add(info->range_start, giveback, E820_RAM);
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dprintf(1, "Returned %d bytes of ZoneHigh\n", giveback);
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}
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+#endif
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calcRamSize();
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}
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--
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2.27.0
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