linux-kernel - Re: [PATCH v10 031/108] KVM: x86/mmu: Replace hardcoded value 0 for the initial value for SPTE

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Message-ID: <eab804a34b96dfdd74a816b92039fca9a81475f0.camel@intel.com>
Date:   Tue, 8 Nov 2022 11:33:12 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>
CC:     "sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Shahar, Sagi" <sagis@...gle.com>,
        "Aktas, Erdem" <erdemaktas@...gle.com>,
        "isaku.yamahata@...il.com" <isaku.yamahata@...il.com>,
        "dmatlack@...gle.com" <dmatlack@...gle.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>
Subject: Re: [PATCH v10 031/108] KVM: x86/mmu: Replace hardcoded value 0 for
 the initial value for SPTE

On Sat, 2022-10-29 at 23:22 -0700, isaku.yamahata@...el.com wrote:
> The plan is to unconditionally set the "suppress #VE" bit for both AMD and
> Intel as: 1) AMD hardware doesn't use this bit; 2) for conventional VMX
> guests, KVM never enables the "EPT-violation #VE" in VMCS control and
> "suppress #VE" bit is ignored by hardware.

Hi Isaku,

"AMD hardware doesn't use this bit" is wrong:

https://lore.kernel.org/lkml/cover.1659854790.git.isaku.yamahata@intel.com/T/#m5ed59404da43677e99ac51dd1360dc22b964bcbb