Re: [Qemu-devel] [PATCH] target-i386: add pcid to both Sandy Bridge and Ivy Bridge

[Vincent Bernat]

 ❦  8 janvier 2018 17:37 -0500, Paolo Bonzini <address@hidden> :

>> One possible way to work around this problem is to declare that
>> QEMU 2.12 with KVM will require Linux v3.6 and newer (because we
>> need Linux kernel commit ad756a1603c5 "KVM: VMX: Implement
>> PCID/INVPCID for guests with EPT").
>
> Note that PCID is still not supported for guests without EPT, so
> this would break ept=0 with recent "-cpu" models.  I'm not sure of
> a way to fix it; probably it just has to be documented.

>From the above patch, it seems only INVPCID needs EPT. KVM exposes PCID
whenever it is present on the host.
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