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Date:   Mon, 13 May 2019 09:46:22 -0700
From:   Sean Christopherson <sean.j.christopherson@intel.com>
To:     Dave Hansen <dave.hansen@intel.com>
Cc:     Alexandre Chartre <alexandre.chartre@oracle.com>,
        pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de,
        mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
        dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org,
        kvm@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, konrad.wilk@oracle.com,
        jan.setjeeilers@oracle.com, liran.alon@oracle.com,
        jwadams@google.com
Subject: Re: [RFC KVM 19/27] kvm/isolation: initialize the KVM page table
 with core mappings
Message-ID: <20190513164622.GC28561@linux.intel.com>
References: <1557758315-12667-1-git-send-email-alexandre.chartre@oracle.com>
 <1557758315-12667-20-git-send-email-alexandre.chartre@oracle.com>
 <a9198e28-abe1-b980-597e-2d82273a2c17@intel.com>
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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.