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x86/ibt,xen: Sprinkle the ENDBR

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Even though Xen currently doesn't advertise IBT, prepare for when it
will eventually do so and sprinkle the ENDBR dust accordingly.

Even though most of the entry points are IRET like, the CPL0
Hypervisor can set WAIT-FOR-ENDBR and demand ENDBR at these sites.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154317.873919996@infradead.org
This commit is contained in:
Peter Zijlstra
2022-03-08 16:30:23 +01:00
parent 8b87d8cec1
commit 5b2fc51576
6 changed files with 22 additions and 3 deletions
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2
arch/x86/include/asm/segment.h
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@@ -283,7 +283,7 @@ static inline void vdso_read_cpunode(unsigned *cpu, unsigned *node)
* pop %rcx; pop %r11; jmp early_idt_handler_array[i]; summing up to
* max 8 bytes.
*/
#define XEN_EARLY_IDT_HANDLER_SIZE 8
#define XEN_EARLY_IDT_HANDLER_SIZE (8 + ENDBR_INSN_SIZE)
#ifndef __ASSEMBLY__