Andi Kleen wrote:
This assumption is incorrect. This code is executed after preemption
has been enabled, and we may have even slept before reaching it.
The only thing that counts here is the context before the machine
check event. If there was a vmexit we know it was in guest context.
The only requirement we have is that we're running still on the same
CPU. I assume that's true, otherwise the vmcb accesses wouldn't work?
It's not true, we're in preemptible context and may have even slept.
vmcs access work because we have a preempt notifier called when we are
scheduled in, and will execute vmclear/vmptrld as necessary. Look at
kvm_preempt_ops in virt/kvm_main.c.
We get both an explicit EXIT_REASON and an exception?
These are different cases. The exception is #MC in guest context,
the EXIT_REASON is when a #MC happens while the CPU is executing
the VM entry microcode.
I see, thanks.
--
error compiling committee.c: too many arguments to function
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