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From: Dave Young <dyoung@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: mjg59@srcf.ucam.org, msalter@redhat.com,
	linux-efi@vger.kernel.org, toshi.kani@hp.com,
	matt@console-pimps.org, greg@kroah.com, x86@kernel.org,
	kexec@lists.infradead.org, leif.lindholm@linaro.org,
	James.Bottomley@HansenPartnership.com, horms@verge.net.au,
	bp@alien8.de, ebiederm@xmission.com, hpa@zytor.com,
	akpm@linux-foundation.org, mingo@kernel.org, vgoyal@redhat.com
Subject: [PATCH v6 11/14] x86: add xloadflags bit for efi runtime support on kexec
Date: Mon, 16 Dec 2013 17:30:32 +0800	[thread overview]
Message-ID: <1387186235-15972-12-git-send-email-dyoung@redhat.com> (raw)
In-Reply-To: <1387186235-15972-1-git-send-email-dyoung@redhat.com>

Old kexec-tools can not load new kernel. The reason is kexec-tools do not fill
efi_info in x86 setup header previously, thus efi failed to initialize.
In new kexec-tools it will by default fill efi_info and pass other efi required
infomation to 2nd kernel so kexec kernel efi initialization can succeed finally.

To prevent from breaking userspace, add a new xloadflags bit so kexec-tools
can check the flag and switch to old logic.

changelog:
Matt: +&& defined(CONFIG_KEXEC)
      improve patch description.
HPA: document the flag.

Signed-off-by: Dave Young <dyoung@redhat.com>
Acked-by: Borislav Petkov <bp@suse.de>
---
 Documentation/x86/boot.txt            | 3 +++
 arch/x86/boot/header.S                | 9 ++++++++-
 arch/x86/include/uapi/asm/bootparam.h | 1 +
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Documentation/x86/boot.txt b/Documentation/x86/boot.txt
index f4f268c..cb81741d 100644
--- a/Documentation/x86/boot.txt
+++ b/Documentation/x86/boot.txt
@@ -608,6 +608,9 @@ Protocol:       2.12+
 	- If 1, the kernel supports the 64-bit EFI handoff entry point
           given at handover_offset + 0x200.
 
+  Bit 4 (read): XLF_EFI_KEXEC
+	- If 1, the kernel supports kexec EFI boot with EFI runtime support.
+
 Field name:	cmdline_size
 Type:		read
 Offset/size:	0x238/4
diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 9ec06a1..ec3b8ba 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -391,7 +391,14 @@ xloadflags:
 #else
 # define XLF23 0
 #endif
-			.word XLF0 | XLF1 | XLF23
+
+#if defined(CONFIG_X86_64) && defined(CONFIG_EFI) && defined(CONFIG_KEXEC)
+# define XLF4 XLF_EFI_KEXEC
+#else
+# define XLF4 0
+#endif
+
+			.word XLF0 | XLF1 | XLF23 | XLF4
 
 cmdline_size:   .long   COMMAND_LINE_SIZE-1     #length of the command line,
                                                 #added with boot protocol
diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
index 64fe421..225b098 100644
--- a/arch/x86/include/uapi/asm/bootparam.h
+++ b/arch/x86/include/uapi/asm/bootparam.h
@@ -24,6 +24,7 @@
 #define XLF_CAN_BE_LOADED_ABOVE_4G	(1<<1)
 #define XLF_EFI_HANDOVER_32		(1<<2)
 #define XLF_EFI_HANDOVER_64		(1<<3)
+#define XLF_EFI_KEXEC			(1<<4)
 
 #ifndef __ASSEMBLY__
 
-- 
1.8.3.1


_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

  parent reply	other threads:[~2013-12-16  9:33 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-12-16  9:30 [PATCH v6 00/14] kexec kernel efi runtime support Dave Young
2013-12-16  9:30 ` [PATCH v6 01/14] x86/mm: sparse warning fix for early_memremap Dave Young
2013-12-16  9:30 ` [PATCH v6 02/14] efi: Use early_memremap and early_memunmap to fix sparse warnings Dave Young
2013-12-16  9:30 ` [PATCH v6 03/14] efi: remove unused variables in __map_region Dave Young
2013-12-16  9:30 ` [PATCH v6 04/14] efi: add a wrapper function efi_map_region_fixed Dave Young
2013-12-16  9:30 ` [PATCH v6 05/14] efi: reserve boot service fix Dave Young
2013-12-16  9:30 ` [PATCH v6 06/14] efi: cleanup efi_enter_virtual_mode function Dave Young
2013-12-16  9:30 ` [PATCH v6 07/14] efi: export more efi table variable to sysfs Dave Young
2013-12-16  9:30 ` [PATCH v6 08/14] efi: export efi runtime memory mapping " Dave Young
2013-12-16 15:09   ` Matt Fleming
2013-12-17  6:13     ` Dave Young
2013-12-17  8:00   ` [PATCH v7 " Dave Young
2013-12-16  9:30 ` [PATCH v6 09/14] efi: passing kexec necessary efi data via setup_data Dave Young
2013-12-17  8:01   ` [PATCH v7 " Dave Young
2013-12-17  8:08     ` Dave Young
2013-12-16  9:30 ` [PATCH v6 10/14] efi: only print saved efi runtime maps instead of all memmap ranges for kexec Dave Young
2013-12-19 16:41   ` Matt Fleming
2013-12-20  1:35     ` Dave Young
2013-12-20  1:57       ` Dave Young
2013-12-16  9:30 ` Dave Young [this message]
2013-12-16  9:30 ` [PATCH v6 12/14] x86: export x86 boot_params to sysfs Dave Young
2013-12-16  9:30 ` [PATCH v6 13/14] x86: reserve setup_data ranges late after parsing memmap cmdline Dave Young
2013-12-16  9:30 ` [PATCH v6 14/14] x86: kdebugfs do not use __va for getting setup_data virt addr Dave Young
2013-12-16 16:35   ` Matt Fleming
2013-12-17  6:24     ` Dave Young
2013-12-17  6:53       ` Dave Young
2013-12-17 11:24         ` Matt Fleming
2013-12-18  9:29           ` Dave Young

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