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Frediano Ziglio
e58a2858d5
Right now, Xen clobbers the value at 0xffc when performing it's load-base calculation. We've got plenty of free registers at this point, so the value can be preserved easily. This fixes a real bug booting under Coreboot+SeaBIOS, where 0xffc happens to be the cbmem pointer (e.g. Coreboot's dmesg ring, among other things). However, there's also a better choice of memory location to use than 0xffc, as all our supported boot protocols have a pointer to an info structure in %ebx. Update the documentation to match. Fixes:1695e53851("x86/boot: Fix the boot time relocation calculations") Fixes:d96bb172e8("x86/entry: Early PVH boot code") Signed-off-by: Frediano Ziglio <frediano.ziglio@cloud.com> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jason Andryuk <jason.andryuk@amd.com> Reviewed-by: Jan Beulich <jbeulich@suse.com>
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