Re: [PATCH] deal with interrupt shadow state for emulated instruction

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H. Peter Anvin wrote:
Avi Kivity wrote:

We don't emulate guest user mode.

Well, if guest userspace can convince its kernel to give it access to some memory mapped I/O register, I guess it can execute repeated 'mov ss, mmio' and starve the guest kernel.


It doesn't need a MMIO register to do that, even.


Can you explain how?

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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