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Re: [Qemu-devel] [PATCH] target-i386: add pcid to both Sandy Bridge and
From: |
Vincent Bernat |
Subject: |
Re: [Qemu-devel] [PATCH] target-i386: add pcid to both Sandy Bridge and Ivy Bridge |
Date: |
Tue, 09 Jan 2018 07:40:26 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux) |
❦ 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.
--
When you are about to die, a wombat is better than no company at all.
-- Roger Zelazny, "Doorways in the Sand"
- Re: [Qemu-devel] [PATCH] target-i386: add pcid to both Sandy Bridge and Ivy Bridge, (continued)
Re: [Qemu-devel] [PATCH] target-i386: add pcid to both Sandy Bridge and Ivy Bridge, Paolo Bonzini, 2018/01/08
Re: [Qemu-devel] [PATCH] target-i386: add pcid to both Sandy Bridge and Ivy Bridge, Vincent Bernat, 2018/01/09
Re: [Qemu-devel] [PATCH] target-i386: add pcid to both Sandy Bridge and Ivy Bridge,
Vincent Bernat <=