linux-kernel - [PATCH -v4] x86: only load initrd above 4g on second try

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Date:	Wed,  3 Sep 2014 21:50:07 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Matt Fleming <matt.fleming@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>
Cc:	Mantas Mikulėnas <grawity@...il.com>,
	Anders Darander <anders@...rgestorm.se>,
	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH -v4] x86: only load initrd above 4g on second try

Mantas found that after commit 4bf7111f5016 ("x86/efi: Support initrd
loaded above 4G"), the kernel freezes at the earliest possible moment
when trying to boot via UEFI on Asus laptop.

Revert to old way to load initrd under 4G on first try,
second try will use above 4G buffer when initrd is too big
and does not fit under 4G.

-v2: add print out for second try, and print out files buf address.
-v3: can not snprintf
-v4: drop address print out for files buf

Reported-by: Mantas Mikulėnas <grawity@...il.com>
Tested-by: Anders Darander <anders@...rgestorm.se>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/boot/compressed/eboot.c |   18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

Index: linux-2.6/arch/x86/boot/compressed/eboot.c
===================================================================
--- linux-2.6.orig/arch/x86/boot/compressed/eboot.c
+++ linux-2.6/arch/x86/boot/compressed/eboot.c
@@ -1032,7 +1032,6 @@ struct boot_params *make_boot_params(str
 	int i;
 	unsigned long ramdisk_addr;
 	unsigned long ramdisk_size;
-	unsigned long initrd_addr_max;
 
 	efi_early = c;
 	sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
@@ -1095,15 +1094,20 @@ struct boot_params *make_boot_params(str
 
 	memset(sdt, 0, sizeof(*sdt));
 
-	if (hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G)
-		initrd_addr_max = -1UL;
-	else
-		initrd_addr_max = hdr->initrd_addr_max;
-
 	status = handle_cmdline_files(sys_table, image,
 				      (char *)(unsigned long)hdr->cmd_line_ptr,
-				      "initrd=", initrd_addr_max,
+				      "initrd=", hdr->initrd_addr_max,
 				      &ramdisk_addr, &ramdisk_size);
+
+	if (status != EFI_SUCCESS &&
+	    hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
+		efi_printk(sys_table, "Trying to load files to higher address\n");
+		status = handle_cmdline_files(sys_table, image,
+				      (char *)(unsigned long)hdr->cmd_line_ptr,
+				      "initrd=", -1UL,
+				      &ramdisk_addr, &ramdisk_size);
+	}
+
 	if (status != EFI_SUCCESS)
 		goto fail2;
 	hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
--
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