real_mode_data aka zero-page could be above 4g.
We will have #PF handler to set page table for not accessible ram
early, but could limit it before x86_64_start_reservations to limit
the change to native path.
Also we will need to ramdisk info in zero-page to access microcode
blob in ramdisk in x86_64_start_kernel, so copy zero-page early make
it accessing ramdisk info simple.
Signed-off-by: Yinghai Lu <ying...@kernel.org>
Cc: Alexander Duyck <alexander.h.du...@intel.com>
Cc: Fenghua Yu <fenghua...@intel.com>
---
arch/x86/kernel/head64.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 7b215a5..c0a25e0 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -87,6 +87,8 @@ void __init x86_64_start_kernel(char * real_mode_data)
}
load_idt((const struct desc_ptr *)&idt_descr);
+ copy_bootdata(__va(real_mode_data));
+
if (console_loglevel == 10)
early_printk("Kernel alive\n");
@@ -95,7 +97,9 @@ void __init x86_64_start_kernel(char * real_mode_data)
void __init x86_64_start_reservations(char *real_mode_data)
{
- copy_bootdata(__va(real_mode_data));
+ /* version is always not zero if it is copied */
+ if (!boot_params.hdr.version)
+ copy_bootdata(__va(real_mode_data));
memblock_reserve(__pa_symbol(_text),
(unsigned long)__bss_stop - (unsigned long)_text);
--
1.7.10.4
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