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Fri, 7 Dec 2018 13:41:54 +0000 (UTC) Received: from [10.36.112.59] (ovpn-112-59.ams2.redhat.com [10.36.112.59]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9EEA25D9C6; Fri, 7 Dec 2018 13:41:47 +0000 (UTC) Subject: Re: [PATCH v8 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN_PVH To: Juergen Gross , Maran Wilson , x86@kernel.org, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, boris.ostrovsky@oracle.com, jpoimboe@redhat.com, kirill.shutemov@linux.intel.com, bp@suse.de, thomas.lendacky@amd.com, luto@kernel.org, dave.hansen@linux.intel.com, roger.pau@citrix.com, rkrcmar@redhat.com, rdunlap@infradead.org References: <1544076152-21637-1-git-send-email-maran.wilson@oracle.com> <1544076257-21792-1-git-send-email-maran.wilson@oracle.com> <2c289956-0e6a-700c-605d-83685fbb08f9@suse.com> From: Paolo Bonzini Openpgp: preference=signencrypt Autocrypt: addr=pbonzini@redhat.com; prefer-encrypt=mutual; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <2c289956-0e6a-700c-605d-83685fbb08f9@suse.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Fri, 07 Dec 2018 13:41:54 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/12/18 07:02, Juergen Gross wrote: > On 06/12/2018 23:11, Paolo Bonzini wrote: >> On 06/12/18 07:04, Maran Wilson wrote: >>> +config PVH >>> + bool "Support for running PVH guests" >>> + ---help--- >>> + This option enables the PVH entry point for guest virtual machines >>> + as specified in the x86/HVM direct boot ABI. >>> + >> >> IIUC this breaks "normal" bzImage boot, so we should have something like >> >> The resulting kernel will not boot with most x86 boot loaders >> such as GRUB or SYSLINUX. Unless you plan to start the kernel >> using QEMU or Xen, you probably want to say N here. > > The resulting kernel should be able to be booted either in PVH mode > via the PVH entry point or the "normal" way via the still existing > old entry point(s). > > It is an _additional_ way to boot the kernel, not an exclusive > alternative. Yup, understood now. Different binaries but one build. Paolo