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a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1626188983; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=28uLKl2AaulOAU1cviaKzK4VHArehXLuMrftITCUqBI=; b=ngPHa5hM8rfEjdSu5ia5uRm1lW6NNnxuMQizbNQxeohP/15LJdVriT1ETUb59OyX//BR1i LA+TXMq/atVsZZ4jhsww32UUB174spJHfbVk/Q0Ed2e2f54VBVffklDikSYPc+1GrCT1Mq EM5F1/KShLuQkw+txBd1mZXRE7KLImM= Subject: Re: [PATCH] stubdom: foreignmemory: Fix build after 0dbb4be739c5 To: Julien Grall , Jan Beulich Cc: Julien Grall , Ian Jackson , Wei Liu , xen-devel@lists.xenproject.org, Andrew Cooper , Costin Lupu References: <20210713092019.7379-1-julien@xen.org> <0698e4b1-8fb9-919e-e9a2-1b135a808e3e@suse.com> <756ba923-17a6-0889-cc7e-bcd43a5eb258@citrix.com> <3505f2da-4c41-f5ca-d775-814d038d5bad@xen.org> <3c819563-b354-5527-050d-f698324d6021@xen.org> <65d35862-304c-7fe3-82de-3ff62f06529a@suse.com> <40c00267-60d2-c0fc-cde4-8ac4ce936f87@suse.com> <69c62b4c-b46f-9eab-8dfd-742c07423424@suse.com> From: Juergen Gross Message-ID: Date: Tue, 13 Jul 2021 17:09:42 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="wBDReZjgVz7ESAQ0DWulygyjkhupS7V34" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --wBDReZjgVz7ESAQ0DWulygyjkhupS7V34 Content-Type: multipart/mixed; boundary="p5tm4OmIRJrbZWSCKJ8RBaen12QOYVy3J"; protected-headers="v1" From: Juergen Gross To: Julien Grall , Jan Beulich Cc: Julien Grall , Ian Jackson , Wei Liu , xen-devel@lists.xenproject.org, Andrew Cooper , Costin Lupu Message-ID: Subject: Re: [PATCH] stubdom: foreignmemory: Fix build after 0dbb4be739c5 References: <20210713092019.7379-1-julien@xen.org> <0698e4b1-8fb9-919e-e9a2-1b135a808e3e@suse.com> <756ba923-17a6-0889-cc7e-bcd43a5eb258@citrix.com> <3505f2da-4c41-f5ca-d775-814d038d5bad@xen.org> <3c819563-b354-5527-050d-f698324d6021@xen.org> <65d35862-304c-7fe3-82de-3ff62f06529a@suse.com> <40c00267-60d2-c0fc-cde4-8ac4ce936f87@suse.com> <69c62b4c-b46f-9eab-8dfd-742c07423424@suse.com> In-Reply-To: --p5tm4OmIRJrbZWSCKJ8RBaen12QOYVy3J Content-Type: multipart/mixed; boundary="------------04EAB4319125C7A031A6B53F" Content-Language: en-US This is a multi-part message in MIME format. --------------04EAB4319125C7A031A6B53F Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 13.07.21 16:38, Julien Grall wrote: > Hi Juergen, >=20 > On 13/07/2021 15:23, Juergen Gross wrote: >> On 13.07.21 16:19, Julien Grall wrote: >>> Hi Jan, >>> >>> On 13/07/2021 15:14, Jan Beulich wrote: >>>>> And I don't think it should be named XC_PAGE_*, but rather XEN_PAGE= _*. >>>> >>>> Even that doesn't seem right to me, at least in principle. There=20 >>>> shouldn't >>>> be a build time setting when it may vary at runtime. IOW on Arm I=20 >>>> think a >>>> runtime query to the hypervisor would be needed instead. >>> >>> Yes, we want to be able to use the same userspace/OS without=20 >>> rebuilding to a specific hypervisor page size. >> >> This define is used for accessing data of other domains. See the defin= e >> for XEN_PAGE_SIZE in xen/include/public/io/ring.h >> >> So it should be a constant (minimal) page size for all hypervisors and= >> guests of an architecture. >=20 > Do you mean the maximum rather than minimal? If you use the minimal=20 > (4KB), then you would not be able to map the page in the stage-2 if the= =20 > hypervisor is using 64KB. But this would mean that the current solution to use XC_PAGE_SIZE is wrong, as this is 4k. 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