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Commit ffae641f authored by Andy Lutomirski's avatar Andy Lutomirski Committed by Thomas Gleixner
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x86/entry/64/compat: Fix Xen PV SYSENTER frame setup



The SYSENTER frame setup was nonsense.  It worked by accident because the
normal code into which the Xen asm jumped (entry_SYSENTER_32/compat) threw
away SP without touching the stack.  entry_SYSENTER_compat was recently
modified such that it relied on having a valid stack pointer, so now the
Xen asm needs to invoke it with a valid stack.

Fix it up like SYSCALL: use the Xen-provided frame and skip the bare
metal prologue.

Fixes: 1c3e5d3f ("x86/entry: Make entry_64_compat.S objtool clean")
Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lkml.kernel.org/r/947880c41ade688ff4836f665d0c9fcaa9bd1201.1593191971.git.luto@kernel.org
parent d1721250
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