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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id jl21sm2423410ejc.42.2021.06.25.02.05.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 25 Jun 2021 02:05:00 -0700 (PDT) Subject: Re: [PATCH 3/4] KVM: x86: WARN and reject loading KVM if NX is supported but not enabled To: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210615164535.2146172-1-seanjc@google.com> <20210615164535.2146172-4-seanjc@google.com> From: Paolo Bonzini Message-ID: Date: Fri, 25 Jun 2021 11:04:59 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 25/06/21 00:33, Sean Christopherson wrote: > On Tue, Jun 15, 2021, Sean Christopherson wrote: >> WARN if NX is reported as supported but not enabled in EFER. All flavors >> of the kernel, including non-PAE 32-bit kernels, set EFER.NX=1 if NX is >> supported, even if NX usage is disable via kernel command line. > > Ugh, I misread .Ldefault_entry in head_32.S, it skips over the entire EFER code > if PAE=0. Apparently I didn't test this with non-PAE paging and EPT? > > Paolo, I'll send a revert since it's in kvm/next, but even better would be if > you can drop the patch :-) Lucky for me you didn't pick up patch 4/4 that > depends on this... > > I'll revisit this mess in a few weeks. Rather, let's keep this, see if anyone complains and possibly add a "depends on X86_PAE || X86_64" to KVM. Paolo