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([2001:b07:6468:f312:e56d:fbdf:8b79:c79c]) by smtp.gmail.com with ESMTPSA id a7sm10244208wra.43.2019.10.04.00.34.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 04 Oct 2019 00:34:20 -0700 (PDT) Subject: Re: [RFC PATCH 12/13] mmap: Add XO support for KVM XO To: Rick Edgecombe , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, luto@kernel.org, peterz@infradead.org, dave.hansen@intel.com, sean.j.christopherson@intel.com, keescook@chromium.org Cc: kristen@linux.intel.com, deneen.t.dock@intel.com References: <20191003212400.31130-1-rick.p.edgecombe@intel.com> <20191003212400.31130-13-rick.p.edgecombe@intel.com> From: Paolo Bonzini Openpgp: preference=signencrypt Message-ID: Date: Fri, 4 Oct 2019 09:34:19 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20191003212400.31130-13-rick.p.edgecombe@intel.com> Content-Language: en-US X-MC-Unique: vU8dDoGdM0GHFyfudF1VbA-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 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 03/10/19 23:23, Rick Edgecombe wrote: > + > +=09protection_map[4] =3D PAGE_EXECONLY; > +=09protection_map[12] =3D PAGE_EXECONLY; Can you add #defines for the bits in protection_map? Also perhaps you can replace the p_xo/p_xr/s_xo/s_xr checks with just with "if (pgtable_kvmxo_enabled()". Paolo > +=09/* Prefer non-pkey XO capability if available, to save a pkey */ > + > +=09if (flags & MAP_PRIVATE && (p_xo !=3D p_xr)) > +=09=09return 0; > + > +=09if (flags & MAP_SHARED && (s_xo !=3D s_xr)) > +=09=09return 0; > > +=09pkey =3D execute_only_pkey(current->mm); > +=09if (pkey < 0)