linux-kernel - Re: [PATCH v4 07/12] KVM: VMX: drop IPAT in memtype when CD=1 for KVM_X86_QUIRK_CD_NW

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Message-ID: <ZPWKP7nVyOg4jJo0@yzhao56-desk.sh.intel.com>
Date:   Mon, 4 Sep 2023 15:41:51 +0800
From:   Yan Zhao <yan.y.zhao@...el.com>
To:     Sean Christopherson <seanjc@...gle.com>
CC:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <pbonzini@...hat.com>, <chao.gao@...el.com>, <kai.huang@...el.com>,
        <robert.hoo.linux@...il.com>, <yuan.yao@...ux.intel.com>
Subject: Re: [PATCH v4 07/12] KVM: VMX: drop IPAT in memtype when CD=1 for
 KVM_X86_QUIRK_CD_NW_CLEARED

...
> > BTW, returning guest MTRR type as if CR0.CD=0 is also not preferred because
> > it still has to hardcode the MTRR type to WB during the
> 
> Please use full names instead of prononous, I found the "it still has to hardcode"
Thanks! yes, will avoid this kind of prononous in future.

> part really hard to grok.  I think this is what you're saying?
> 
>   BTW, returning guest MTRR type as if CR0.CD=0 is also not preferred because
>   KVMs ABI for the quirk also requires KVM to force WB memtype regardless of
>   guest MTRRs to workaround the slow guest boot-up issue.

Yes, exactly :)