From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B225BC00A8F for ; Tue, 24 Oct 2023 15:50:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343600AbjJXPuW (ORCPT ); Tue, 24 Oct 2023 11:50:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37388 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230316AbjJXPuV (ORCPT ); Tue, 24 Oct 2023 11:50:21 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 536CE83 for ; Tue, 24 Oct 2023 08:50:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=48HTOyKjFmW8GGRG6PGs7R76tDJEe6RT7uNcGmrEIFg=; b=M9KSFFQNAm68p1LK1pH5s8fVfi tv/88nXAw/Q/gr58ufi4sa1v3kHsytT1iYU8pMvvdy8v9BYp4OO+7VvHgv3gR/o/LFO4hrMcytMpv 3tJ8+FqhzXhHLTqo/1aLRxjzxNjnw6tFAaD7CvjUCNk5OBfvl0IhLlKO01KPgxbLgQfV9KU9HtmJX 6oszP7V4m1dIbkyP5BVQbuVsAIlXQ7rrs0dtVtA39W3qGYQP8rdNcxhbbboVMYYFnBg7cIFfw+meb Blb+PfzZ/0lon5hu6HxUjV+hz8D8ZVB+mCRMgejq612e1syI668GMXpmuOUlYRXLmU0YViI20qr66 ttEkoKNQ==; Received: from [2001:8b0:10b:5:758e:a1c4:bc7:e7a7] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qvJfJ-003KD4-Sz; Tue, 24 Oct 2023 15:49:57 +0000 Message-ID: <42b005d7c03d5b0d47a16c4e025d8c3ec7289e0f.camel@infradead.org> Subject: Re: [PATCH 12/12] hw/xen: add support for Xen primary console in emulated mode From: David Woodhouse To: paul@xen.org, qemu-devel@nongnu.org Cc: Kevin Wolf , Hanna Reitz , Stefano Stabellini , Anthony Perard , =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau , Paolo Bonzini , "Michael S. Tsirkin" , Marcel Apfelbaum , Richard Henderson , Eduardo Habkost , Marcelo Tosatti , qemu-block@nongnu.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org Date: Tue, 24 Oct 2023 16:49:57 +0100 In-Reply-To: <3f22903b-30f0-40f2-8624-b681d9c7e05d@xen.org> References: <20231016151909.22133-1-dwmw2@infradead.org> <20231016151909.22133-13-dwmw2@infradead.org> <3acd078bba2d824f836b20a270c780dc2d031c43.camel@infradead.org> <3f22903b-30f0-40f2-8624-b681d9c7e05d@xen.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-ekZgHvjk85CbxFuqU77j" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org --=-ekZgHvjk85CbxFuqU77j Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-10-24 at 16:39 +0100, Paul Durrant wrote: > On 24/10/2023 16:37, David Woodhouse wrote: > > On Tue, 2023-10-24 at 15:20 +0100, Paul Durrant wrote: > > > On 16/10/2023 16:19, David Woodhouse wrote: > > > > From: David Woodhouse > > > >=20 > > > > The primary console is special because the toolstack maps a page at= a > > > > fixed GFN and also allocates the guest-side event channel. Add supp= ort > > > > for that in emulated mode, so that we can have a primary console. > > > >=20 > > > > Add a *very* rudimentary stub of foriegnmem ops for emulated mode, = which > > > > supports literally nothing except a single-page mapping of the cons= ole > > > > page. This might as well have been a hack in the xen_console driver= , but > > > > this way at least the special-casing is kept within the Xen emulati= on > > > > code, and it gives us a hook for a more complete implementation if/= when > > > > we ever do need one. > > > >=20 > > > Why can't you map the console page via the grant table like the xenst= ore > > > page? > >=20 > > I suppose we could, but I didn't really want the generic xen-console > > device code having any more of a special case for 'Xen emulation' than > > it does already by having to call xen_primary_console_create(). > >=20 >=20 > But doesn't is save you the whole foreignmem thing? You can use the=20 > grant table for primary and secondary consoles. Yes. And I could leave the existing foreignmem thing just for the case of primary console under true Xen. It's probably not that awful a special case, in the end. Then again, I was surprised I didn't *already* have a foreignmem ops for the emulated case, and we're probably going to want to continue fleshing it out later, so I don't really mind adding it. --=-ekZgHvjk85CbxFuqU77j Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC 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