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[134.134.136.31]) by mx.google.com with ESMTPS id be11si10176029plb.303.2019.05.13.09.46.23 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 May 2019 09:46:23 -0700 (PDT) Received-SPF: pass (google.com: domain of sean.j.christopherson@intel.com designates 134.134.136.31 as permitted sender) client-ip=134.134.136.31; Authentication-Results: mx.google.com; spf=pass (google.com: domain of sean.j.christopherson@intel.com designates 134.134.136.31 as permitted sender) smtp.mailfrom=sean.j.christopherson@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 May 2019 09:46:22 -0700 X-ExtLoop1: 1 Received: from sjchrist-coffee.jf.intel.com (HELO linux.intel.com) ([10.54.74.36]) by orsmga002.jf.intel.com with ESMTP; 13 May 2019 09:46:22 -0700 Date: Mon, 13 May 2019 09:46:22 -0700 From: Sean Christopherson To: Dave Hansen Cc: Alexandre Chartre , 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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.