Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Fri, 18 Mar 2022 11:55:11 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Dave Hansen <dave.hansen@intel.com>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>, mingo@redhat.com,
        bp@alien8.de, luto@kernel.org,
        sathyanarayanan.kuppuswamy@linux.intel.com, aarcange@redhat.com,
        ak@linux.intel.com, dan.j.williams@intel.com, david@redhat.com,
        hpa@zytor.com, jgross@suse.com, jmattson@google.com,
        joro@8bytes.org, jpoimboe@redhat.com, knsathya@kernel.org,
        pbonzini@redhat.com, sdeep@vmware.com, seanjc@google.com,
        tony.luck@intel.com, vkuznets@redhat.com, wanpengli@tencent.com,
        thomas.lendacky@amd.com, brijesh.singh@amd.com, x86@kernel.org,
        linux-kernel@vger.kernel.org,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Dave Hansen <dave.hansen@linux.intel.com>
Subject: Re: [PATCHv6 07/30] x86/traps: Add #VE support for TDX guest
Message-ID: <YjRlDytYjENcurpT@hirez.programming.kicks-ass.net>
References: <20220316020856.24435-1-kirill.shutemov@linux.intel.com>
 <20220316020856.24435-8-kirill.shutemov@linux.intel.com>
 <877d8t2ykp.ffs@tglx>
 <20220317173354.rqymufl37lcrtmjh@black.fi.intel.com>
 <20220317202141.GO8939@worktop.programming.kicks-ass.net>
 <5b3bece3-5956-3116-a07c-a0b6f380fac8@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <5b3bece3-5956-3116-a07c-a0b6f380fac8@intel.com>
Precedence: bulk

On Thu, Mar 17, 2022 at 01:32:07PM -0700, Dave Hansen wrote:

> The TDX rules are *much* nicer than SEV.  They're also a lot nicer on
> TDX _now_ than they used to be.  There are a few stubborn people at
> Intel who managed to add some drops of sanity to the architecture.

Right; that is saner than it used to be. I have definite memories that
pages could be taken back by the TDX thing and would need
re-authentication. A pool of 'fixed' pages was talked about. I'm glad to
hear all that is gone.