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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DD68EC5AE59 for ; Thu, 5 Jun 2025 06:53:34 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uN4T9-0004yW-1n; Thu, 05 Jun 2025 02:52:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uN4T7-0004y3-57 for qemu-devel@nongnu.org; Thu, 05 Jun 2025 02:52:53 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uN4T5-00019X-1h for qemu-devel@nongnu.org; Thu, 05 Jun 2025 02:52:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1749106369; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=8qxelnSse5rapuj+2Nw93Nio8dw7MNX2AQ81J5FPQDc=; b=Lug/gZMyoeIpWCQlzzaPi2PSGdx1UFD9TBDGJ4AIJmWGCx/b5cyCsLnSsqJIpqR70esh9p sfqfXh6mWiM/BgLIRi1XPN7PPvHfhDXhf++gwH7RzM+umiedq5XlNnStKl4yhX3VGIzzmY yvEqCgDncrdlMeouyLh2JBoJc5kiJxY= Received: from mail-ej1-f72.google.com (mail-ej1-f72.google.com [209.85.218.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-439-S58FyI0vN_2kZuinN_v7EQ-1; Thu, 05 Jun 2025 02:52:47 -0400 X-MC-Unique: S58FyI0vN_2kZuinN_v7EQ-1 X-Mimecast-MFC-AGG-ID: S58FyI0vN_2kZuinN_v7EQ_1749106366 Received: by mail-ej1-f72.google.com with SMTP id a640c23a62f3a-ad56a52edc5so55492466b.0 for ; Wed, 04 Jun 2025 23:52:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749106366; x=1749711166; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=8qxelnSse5rapuj+2Nw93Nio8dw7MNX2AQ81J5FPQDc=; b=Xov20zvpQNNchoR127yAvg2Y5xCpdm5LuMwdObakbn1C7flAE4391QoySfLx/8oU6j lMK7ovtzaRR0c9ddCbDMg0ouyxYMTDk+tPGiKGRTtUvPjJmS4t+BocNz8Mu4MUcjVsPP tL5VRLWOEvAaQNHnVL77t+lTI1yezj9l/+BZl9hzvpnAQt981kuju+QgfFm+IbuZeUg4 HXxaLRwE+FqZjklepuADhV0CZjWf6USDMiKJ95dtQJMRksrx6dXqCcjQvrvN4irtCP/A v3DWMEoRVPu+oD68/nTV35cy4unQk4WiytsFoe8cXitK5PmVFhExrwPhLzw5Pjn37lOu gc4A== X-Forwarded-Encrypted: i=1; AJvYcCU82v4ZevktEFBxoBdIEa4JkfD9YkKQzUZOGlilawyXQ++yM/smAurv38LW7JP327M/wS71EqKlGFFj@nongnu.org X-Gm-Message-State: AOJu0Yyp9pZWwu+vrNr8gXJ2PcHc5aGTNC1JoUI4eFO5Ekz+uVXejqK2 503gtfxdktBLvMNzHaDG7X9mWRhE2k3qgRZWg9ZWsKyN7iTIWlrRmfZFwxlMyWXCrszGNCopJqv WywggUVJPA464qUuQyBgW5FGSlJLJnzxJEmf8YP8cEG4IUccTSjh7RVEe X-Gm-Gg: ASbGncuuAWxnGR/kp3F2PaVaKuGOAob/j64Va9Yki7UD2ESZAWd3+nob7+m9TPCmDlM APP2qk2XRqA0PlowL/ZaBQPTRkODUP5hDzoLMn93u266Z3izbwFyng4L+LbmS1y+dwxBocyYsF1 JRdZkz3AfoVKzxAfEDV/+6IHf90cCnYM15lrtSc1XilP2Sbqy8lsbDGfL9agbCEMXjxJjCNC3Sb K4eat+Xtz7OL/ZUiuprnyvDGvGK+rcUopNLdjSi8cU9Q8uLPu2Mza3LDoJey5yPyvRKfk58Yuy7 tPT/vWSS0KmyzJKVi+tkN2ZO5+zRU4eZNpFwqei8hiIjPmOl4nqm+g== X-Received: by 2002:a17:907:60ca:b0:ad8:89c7:2735 with SMTP id a640c23a62f3a-addf8fe2d0bmr580286266b.58.1749106366315; Wed, 04 Jun 2025 23:52:46 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGxRtF8POw4Hyd7k7hKJIpt1QbKoeel/o+jrsY/gkZEbwvVVFJfxHGSwSk/snWwM+lJv96hvw== X-Received: by 2002:a17:907:60ca:b0:ad8:89c7:2735 with SMTP id a640c23a62f3a-addf8fe2d0bmr580284966b.58.1749106365962; Wed, 04 Jun 2025 23:52:45 -0700 (PDT) Received: from [192.168.0.4] (ip-109-42-50-214.web.vodafone.de. [109.42.50.214]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ada5dd043edsm1226692166b.96.2025.06.04.23.52.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Jun 2025 23:52:45 -0700 (PDT) Message-ID: <58abce8b-c5c2-4fd1-a32c-2d887445097d@redhat.com> Date: Thu, 5 Jun 2025 08:52:44 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: ppc kvm: support of 64K guest page size with 4K host pagesize? To: Michael Tokarev , QEMU Development , David Gibson Cc: qemu-ppc@nongnu.org, =?UTF-8?Q?C=C3=A9dric_Le_Goater?= , Greg Kurz References: <0392df3f-c9fc-4372-a131-f0a7c3313c9c@tls.msk.ru> From: Thomas Huth Content-Language: en-US Autocrypt: addr=thuth@redhat.com; keydata= xsFNBFH7eUwBEACzyOXKU+5Pcs6wNpKzrlJwzRl3VGZt95VCdb+FgoU9g11m7FWcOafrVRwU yYkTm9+7zBUc0sW5AuPGR/dp3pSLX/yFWsA/UB4nJsHqgDvDU7BImSeiTrnpMOTXb7Arw2a2 4CflIyFqjCpfDM4MuTmzTjXq4Uov1giGE9X6viNo1pxyEpd7PanlKNnf4PqEQp06X4IgUacW tSGj6Gcns1bCuHV8OPWLkf4hkRnu8hdL6i60Yxz4E6TqlrpxsfYwLXgEeswPHOA6Mn4Cso9O 0lewVYfFfsmokfAVMKWzOl1Sr0KGI5T9CpmRfAiSHpthhHWnECcJFwl72NTi6kUcUzG4se81 O6n9d/kTj7pzTmBdfwuOZ0YUSqcqs0W+l1NcASSYZQaDoD3/SLk+nqVeCBB4OnYOGhgmIHNW 0CwMRO/GK+20alxzk//V9GmIM2ACElbfF8+Uug3pqiHkVnKqM7W9/S1NH2qmxB6zMiJUHlTH gnVeZX0dgH27mzstcF786uPcdEqS0KJuxh2kk5IvUSL3Qn3ZgmgdxBMyCPciD/1cb7/Ahazr 3ThHQXSHXkH/aDXdfLsKVuwDzHLVSkdSnZdt5HHh75/NFHxwaTlydgfHmFFwodK8y/TjyiGZ zg2Kje38xnz8zKn9iesFBCcONXS7txENTzX0z80WKBhK+XSFJwARAQABzR5UaG9tYXMgSHV0 aCA8dGh1dGhAcmVkaGF0LmNvbT7CwXgEEwECACIFAlVgX6oCGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAAoJEC7Z13T+cC21EbIP/ii9cvT2HHGbFRl8HqGT6+7Wkb+XLMqJBMAIGiQK QIP3xk1HPTsLfVG0ao4hy/oYkGNOP8+ubLnZen6Yq3zAFiMhQ44lvgigDYJo3Ve59gfe99KX EbtB+X95ODARkq0McR6OAsPNJ7gpEUzfkQUUJTXRDQXfG/FX303Gvk+YU0spm2tsIKPl6AmV 1CegDljzjycyfJbk418MQmMu2T82kjrkEofUO2a24ed3VGC0/Uz//XCR2ZTo+vBoBUQl41BD eFFtoCSrzo3yPFS+w5fkH9NT8ChdpSlbNS32NhYQhJtr9zjWyFRf0Zk+T/1P7ECn6gTEkp5k ofFIA4MFBc/fXbaDRtBmPB0N9pqTFApIUI4vuFPPO0JDrII9dLwZ6lO9EKiwuVlvr1wwzsgq zJTPBU3qHaUO4d/8G+gD7AL/6T4zi8Jo/GmjBsnYaTzbm94lf0CjXjsOX3seMhaE6WAZOQQG tZHAO1kAPWpaxne+wtgMKthyPLNwelLf+xzGvrIKvLX6QuLoWMnWldu22z2ICVnLQChlR9d6 WW8QFEpo/FK7omuS8KvvopFcOOdlbFMM8Y/8vBgVMSsK6fsYUhruny/PahprPbYGiNIhKqz7 UvgyZVl4pBFjTaz/SbimTk210vIlkDyy1WuS8Zsn0htv4+jQPgo9rqFE4mipJjy/iboDzsFN BFH7eUwBEAC2nzfUeeI8dv0C4qrfCPze6NkryUflEut9WwHhfXCLjtvCjnoGqFelH/PE9NF4 4VPSCdvD1SSmFVzu6T9qWdcwMSaC+e7G/z0/AhBfqTeosAF5XvKQlAb9ZPkdDr7YN0a1XDfa +NgA+JZB4ROyBZFFAwNHT+HCnyzy0v9Sh3BgJJwfpXHH2l3LfncvV8rgFv0bvdr70U+On2XH 5bApOyW1WpIG5KPJlDdzcQTyptOJ1dnEHfwnABEfzI3dNf63rlxsGouX/NFRRRNqkdClQR3K gCwciaXfZ7ir7fF0u1N2UuLsWA8Ei1JrNypk+MRxhbvdQC4tyZCZ8mVDk+QOK6pyK2f4rMf/ WmqxNTtAVmNuZIwnJdjRMMSs4W4w6N/bRvpqtykSqx7VXcgqtv6eqoDZrNuhGbekQA0sAnCJ VPArerAZGArm63o39me/bRUQeQVSxEBmg66yshF9HkcUPGVeC4B0TPwz+HFcVhheo6hoJjLq knFOPLRj+0h+ZL+D0GenyqD3CyuyeTT5dGcNU9qT74bdSr20k/CklvI7S9yoQje8BeQAHtdV cvO8XCLrpGuw9SgOS7OP5oI26a0548M4KldAY+kqX6XVphEw3/6U1KTf7WxW5zYLTtadjISB X9xsRWSU+Yqs3C7oN5TIPSoj9tXMoxZkCIHWvnqGwZ7JhwARAQABwsFfBBgBAgAJBQJR+3lM AhsMAAoJEC7Z13T+cC21hPAQAIsBL9MdGpdEpvXs9CYrBkd6tS9mbaSWj6XBDfA1AEdQkBOn ZH1Qt7HJesk+qNSnLv6+jP4VwqK5AFMrKJ6IjE7jqgzGxtcZnvSjeDGPF1h2CKZQPpTw890k fy18AvgFHkVk2Oylyexw3aOBsXg6ukN44vIFqPoc+YSU0+0QIdYJp/XFsgWxnFIMYwDpxSHS 5fdDxUjsk3UBHZx+IhFjs2siVZi5wnHIqM7eK9abr2cK2weInTBwXwqVWjsXZ4tq5+jQrwDK cvxIcwXdUTLGxc4/Z/VRH1PZSvfQxdxMGmNTGaXVNfdFZjm4fz0mz+OUi6AHC4CZpwnsliGV ODqwX8Y1zic9viSTbKS01ZNp175POyWViUk9qisPZB7ypfSIVSEULrL347qY/hm9ahhqmn17 Ng255syASv3ehvX7iwWDfzXbA0/TVaqwa1YIkec+/8miicV0zMP9siRcYQkyTqSzaTFBBmqD oiT+z+/E59qj/EKfyce3sbC9XLjXv3mHMrq1tKX4G7IJGnS989E/fg6crv6NHae9Ckm7+lSs IQu4bBP2GxiRQ+NV3iV/KU3ebMRzqIC//DCOxzQNFNJAKldPe/bKZMCxEqtVoRkuJtNdp/5a yXFZ6TfE1hGKrDBYAm4vrnZ4CXFSBDllL59cFFOJCkn4Xboj/aVxxJxF30bn In-Reply-To: <0392df3f-c9fc-4372-a131-f0a7c3313c9c@tls.msk.ru> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.128, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 05/06/2025 08.34, Michael Tokarev wrote: > There's a bug report filed in debian against qemu, > https://bugs.debian.org/1107288 - saying kvm on ppc does not > work on debian (anymore) due to qemu requesting unrealistic > (non-existing) page size of 64K on a host which only has 4K. > > I don't know much about PPC, - what's the issue here? Should > qemu use the same page size for kvm as on the host? Looking at https://gitlab.com/qemu-project/qemu/-/commit/2309832afdaf8d6451ebc2e81bace8eb8ea41293 it seems like this was done on purpose? David, do you remember why auto-detecting was not a good idea here? Anyway, seems like there is a hpt-max-page-size property that could be used to set the value manually - maybe you could suggest that to the user as a work-around? Thomas