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D43930.id134432.diff
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diff --git a/sys/amd64/amd64/xen-locore.S b/sys/amd64/amd64/xen-locore.S
--- a/sys/amd64/amd64/xen-locore.S
+++ b/sys/amd64/amd64/xen-locore.S
@@ -67,7 +67,7 @@
.p2align PAGE_SHIFT, 0x90 /* Hypercall_page needs to be PAGE aligned */
ENTRY(hypercall_page)
- .skip 0x1000, 0x90 /* Fill with "nop"s */
+ .skip 0x1000, 0xcc /* Fill with `int3` to generate a #BP trap. */
/* PVH entry point. */
.code32
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D43930.id134432.diff (408 B)
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D43930: x86/xen: fill hypercall page with int3
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