Matteo Frigo wrote:
Avi Kivity <avi@xxxxxxxxxx> writes:
Can you rerun on AMD, but set add npt=0 as a kvm-amd module parameter?
This will determine if this is an mmu bug or kvm-intel bug.
AMD works fine with npt=0, both cygwin and my setjmp()/longjmp() test
program. dmesg confirms that nested paging is disabled.
So it isn't the mmu.
I'm a a little far latency-wise from an AMD host. Can you run this
experiment on AMD (-monitor stdio will help):
- run a cygwin program in an infinite loop (while :; do :; done is
sufficient)
- 'info registers', look at gdt
- 'x/28x 0x$GDT'
I'm interested in offset 0x28, but please provide the whole thing for
sanity checking.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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