On 08/11/2011 08:41 AM, Tian, Kevin wrote:
> qemu-system-x86-4454 [004] 549.958172: kvm_exit:
> reason EXCEPTION_NMI rip 0x8051d5e1
> qemu-system-x86-4454 [004] 549.958172: kvm_page_fault:
> address c8f8a000 error_code b
error_code 'b' means the page fault is caused by a write access in kernel
space, but related page entry has reserved bit set. This is usually used by
OS for some special tricks, e.g. to handle page swaps. You may check related
setting in win guest.
In this case it was kvm setting the reserved bit.
Looking at your other trace, that server is probably an AMD with the NPT
feature, while your first one is an Intel without the equivalent (EPT).
For this type of workload, you need EPT or NPT.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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