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Message-Id: <1357260531-11115-6-git-send-email-yinghai@kernel.org> Date: Thu, 3 Jan 2013 16:48:25 -0800 From: Yinghai Lu <yinghai@...nel.org> To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com> Cc: "Eric W. Biederman" <ebiederm@...ssion.com>, Andrew Morton <akpm@...ux-foundation.org>, Borislav Petkov <bp@...en8.de>, Jan Kiszka <jan.kiszka@....de>, Jason Wessel <jason.wessel@...driver.com>, linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>, Alexander Duyck <alexander.h.duyck@...el.com>, Fenghua Yu <fenghua.yu@...el.com> Subject: [PATCH v7u1 05/31] x86, 64bit: copy zero-page early 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 <yinghai@...nel.org> Cc: Alexander Duyck <alexander.h.duyck@...el.com> Cc: Fenghua Yu <fenghua.yu@...el.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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