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xen-devel
Re: [Xen-devel] [PATCH 2/5] xen/x86-64: clean up warnings aboutIST-usin
Jan Beulich wrote:
else if (addr == (unsigned long)int3)
addr = (unsigned long)xen_int3;
- else
- WARN_ON(val->ist != 0);
+ else if (addr == (unsigned long)double_fault ||
+ addr == (unsigned long)stack_segment) {
I don't think you want to exclude handling stack faults: Ordinary memory
references using rsp or rbp as the base register will cause these instead
of general protection faults when the resulting effective address is non-
canonical.
So even usermode memory accesses? Ew. Well, we can run the trap
handler on the normal kernel stack in that case. I'll cook something up.
J
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