linux-kernel - Re: [RFC KVM 19/27] kvm/isolation: initialize the KVM page table with core mappings

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Message-ID: <20190513164622.GC28561@linux.intel.com>
Date:   Mon, 13 May 2019 09:46:22 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Alexandre Chartre <alexandre.chartre@...cle.com>,
        pbonzini@...hat.com, rkrcmar@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        kvm@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, konrad.wilk@...cle.com,
        jan.setjeeilers@...cle.com, liran.alon@...cle.com,
        jwadams@...gle.com
Subject: Re: [RFC KVM 19/27] kvm/isolation: initialize the KVM page table
 with core mappings

On Mon, May 13, 2019 at 08:50:19AM -0700, Dave Hansen wrote:
> I seem to remember that the KVM VMENTRY/VMEXIT context is very special.
> Interrupts (and even NMIs?) are disabled.  Would it be feasible to do
> the switching in there so that we never even *get* interrupts in the KVM
> context?

NMIs are enabled on VMX's VM-Exit.  On SVM, NMIs are blocked on exit until
STGI is executed.