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lguest: allow booting guest with CONFIG_RELOCATABLE=y

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The CONFIG_RELOCATABLE code tries to align the unpack destination to
the value of 'kernel_alignment' in the setup_hdr.  If that's 0, it
tries to unpack to address 0, which in fact causes the gunzip code
to call 'error("Out of memory while allocating output buffer")'.

The bootloader (ie. the lguest Launcher in this case) should be doing
setting this field; the normal bzImage is 16M, we can use the same.

Reported-by: Stefanos Geraggelos <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
Cc: [email protected]
This commit is contained in:
Rusty Russell 2011-08-15 10:15:10 +09:30
commit e22a539824
1 changed files with 3 additions and 0 deletions
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3
Documentation/virtual/lguest/lguest.c
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@ -1996,6 +1996,9 @@ int main(int argc, char *argv[])
/* We use a simple helper to copy the arguments separated by spaces. */
concat((char *)(boot + 1), argv+optind+2);
/* Set kernel alignment to 16M (CONFIG_PHYSICAL_ALIGN) */
boot->hdr.kernel_alignment = 0x1000000;
/* Boot protocol version: 2.07 supports the fields for lguest. */
boot->hdr.version = 0x207;