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Re: [Qemu-devel] [PATCH v3 1/2] kvm: support -dedicated cpu-pm=on|off

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v3 1/2] kvm: support -dedicated cpu-pm=on|off
Date: Wed, 20 Jun 2018 16:20:40 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

On 19/06/2018 22:43, Michael S. Tsirkin wrote:
>> 2) Maybe -hostresource?
> Is ability to cause high latency for other threads really a resource?

The "resource" here is host CPU time.  In general, a vCPU with
KVM_CPU_X86_DISABLE_EXITS will use more host CPU time and block
overcommitting, just like mlock does for memory.


> The issues in question:
> 1. a malicious guest can cause high latency for others sharing the host cpu.
> 2. to host scheduler cpu looks busier than it really is.

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