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[88.21.68.214]) by smtp.gmail.com with ESMTPSA id z127sm3454400wme.44.2020.07.28.03.00.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 28 Jul 2020 03:00:34 -0700 (PDT) Subject: Re: [PATCH] configure: define CONFIG_XEN when Xen is enabled From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= To: Peter Maydell References: <20200728091828.21702-1-paul@xen.org> <32ad0742-bff2-1fbc-2f7a-d078980eb171@redhat.com> Autocrypt: addr=philmd@redhat.com; keydata= mQINBDXML8YBEADXCtUkDBKQvNsQA7sDpw6YLE/1tKHwm24A1au9Hfy/OFmkpzo+MD+dYc+7 bvnqWAeGweq2SDq8zbzFZ1gJBd6+e5v1a/UrTxvwBk51yEkadrpRbi+r2bDpTJwXc/uEtYAB GvsTZMtiQVA4kRID1KCdgLa3zztPLCj5H1VZhqZsiGvXa/nMIlhvacRXdbgllPPJ72cLUkXf z1Zu4AkEKpccZaJspmLWGSzGu6UTZ7UfVeR2Hcc2KI9oZB1qthmZ1+PZyGZ/Dy+z+zklC0xl XIpQPmnfy9+/1hj1LzJ+pe3HzEodtlVA+rdttSvA6nmHKIt8Ul6b/h1DFTmUT1lN1WbAGxmg CH1O26cz5nTrzdjoqC/b8PpZiT0kO5MKKgiu5S4PRIxW2+RA4H9nq7nztNZ1Y39bDpzwE5Sp bDHzd5owmLxMLZAINtCtQuRbSOcMjZlg4zohA9TQP9krGIk+qTR+H4CV22sWldSkVtsoTaA2 qNeSJhfHQY0TyQvFbqRsSNIe2gTDzzEQ8itsmdHHE/yzhcCVvlUzXhAT6pIN0OT+cdsTTfif MIcDboys92auTuJ7U+4jWF1+WUaJ8gDL69ThAsu7mGDBbm80P3vvUZ4fQM14NkxOnuGRrJxO qjWNJ2ZUxgyHAh5TCxMLKWZoL5hpnvx3dF3Ti9HW2dsUUWICSQARAQABtDJQaGlsaXBwZSBN YXRoaWV1LURhdWTDqSAoUGhpbCkgPHBoaWxtZEByZWRoYXQuY29tPokCVQQTAQgAPwIbDwYL CQgHAwIGFQgCCQoLBBYCAwECHgECF4AWIQSJweePYB7obIZ0lcuio/1u3q3A3gUCXsfWwAUJ KtymWgAKCRCio/1u3q3A3ircD/9Vjh3aFNJ3uF3hddeoFg1H038wZr/xi8/rX27M1Vj2j9VH 0B8Olp4KUQw/hyO6kUxqkoojmzRpmzvlpZ0cUiZJo2bQIWnvScyHxFCv33kHe+YEIqoJlaQc JfKYlbCoubz+02E2A6bFD9+BvCY0LBbEj5POwyKGiDMjHKCGuzSuDRbCn0Mz4kCa7nFMF5Jv piC+JemRdiBd6102ThqgIsyGEBXuf1sy0QIVyXgaqr9O2b/0VoXpQId7yY7OJuYYxs7kQoXI 6WzSMpmuXGkmfxOgbc/L6YbzB0JOriX0iRClxu4dEUg8Bs2pNnr6huY2Ft+qb41RzCJvvMyu gS32LfN0bTZ6Qm2A8ayMtUQgnwZDSO23OKgQWZVglGliY3ezHZ6lVwC24Vjkmq/2yBSLakZE 6DZUjZzCW1nvtRK05ebyK6tofRsx8xB8pL/kcBb9nCuh70aLR+5cmE41X4O+MVJbwfP5s/RW 9BFSL3qgXuXso/3XuWTQjJJGgKhB6xXjMmb1J4q/h5IuVV4juv1Fem9sfmyrh+Wi5V1IzKI7 RPJ3KVb937eBgSENk53P0gUorwzUcO+ASEo3Z1cBKkJSPigDbeEjVfXQMzNt0oDRzpQqH2vp apo2jHnidWt8BsckuWZpxcZ9+/9obQ55DyVQHGiTN39hkETy3Emdnz1JVHTU0Q== Message-ID: Date: Tue, 28 Jul 2020 12:00:33 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Paul Durrant , Paul Durrant , QEMU Developers , Laurent Vivier , "open list:X86" , Anthony Perard , Paolo Bonzini Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" On 7/28/20 11:56 AM, Philippe Mathieu-Daudé wrote: > On 7/28/20 11:53 AM, Peter Maydell wrote: >> On Tue, 28 Jul 2020 at 10:51, Philippe Mathieu-Daudé wrote: >>> I'd rather uninline xen_enabled() but I'm not sure this has perf >>> penalties. Paolo is that OK to uninline it? > > I suppose no because it is in various hot paths: > > exec.c:588: if (xen_enabled() && memory_access_is_direct(mr, is_write)) { > exec.c:2243: if (xen_enabled()) { > exec.c:2326: if (xen_enabled()) { > exec.c:2478: } else if (xen_enabled()) { > exec.c:2525: } else if (xen_enabled()) { > exec.c:2576: if (xen_enabled() && block->host == NULL) { > exec.c:2609: if (xen_enabled() && block->host == NULL) { > exec.c:2657: if (xen_enabled()) { > exec.c:3625: if (xen_enabled()) { > exec.c:3717: if (xen_enabled()) { > include/exec/ram_addr.h:295: if (!mask && !xen_enabled()) { > >> >> Can we just follow the same working pattern we already have >> for kvm_enabled() etc ? > > This was the idea... I'll look at what I missed. Apparently kvm_enabled() checks CONFIG_KVM_IS_POSSIBLE instead of CONFIG_KVM, I suppose to bypass this limitation (from osdep.h): 21 #ifdef NEED_CPU_H 22 # ifdef CONFIG_KVM 24 # define CONFIG_KVM_IS_POSSIBLE 25 # endif 26 #else 27 # define CONFIG_KVM_IS_POSSIBLE 28 #endif 29 30 #ifdef CONFIG_KVM_IS_POSSIBLE ... Paolo do you confirm this is the reason? I'll prepare a similar patch. > > Phil. >