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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 15 Jul 2019 21:14:26 +0100 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x6FKEPpM48955724 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 15 Jul 2019 20:14:25 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 658A7AC065; Mon, 15 Jul 2019 20:14:25 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4BA00AC05B; Mon, 15 Jul 2019 20:14:13 +0000 (GMT) Received: from morokweng.localdomain (unknown [9.85.238.93]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTPS; Mon, 15 Jul 2019 20:14:13 +0000 (GMT) References: <20190712053631.9814-1-bauerman@linux.ibm.com> <20190712053631.9814-4-bauerman@linux.ibm.com> <20190712150912.3097215e.pasic@linux.ibm.com> <87tvbqgboc.fsf@morokweng.localdomain> <20190715160317.7e3dfb33.pasic@linux.ibm.com> <20190715143039.GA6892@lst.de> User-agent: mu4e 1.2.0; emacs 26.2 From: Thiago Jung Bauermann To: Christoph Hellwig Subject: Re: [PATCH 3/3] fs/core/vmcore: Move sev_active() reference to x86 arch code In-reply-to: <20190715143039.GA6892@lst.de> Date: Mon, 15 Jul 2019 17:14:04 -0300 MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 x-cbid: 19071520-0072-0000-0000-00000449377D X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011434; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000286; SDB=6.01232669; UDB=6.00649450; IPR=6.01013970; MB=3.00027729; MTD=3.00000008; XFM=3.00000015; UTC=2019-07-15 20:14:30 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19071520-0073-0000-0000-00004CB9812D Message-Id: <875zo3njhv.fsf@morokweng.localdomain> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-07-15_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907150231 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-s390@vger.kernel.org, Mike Anderson , Janosch Frank , Konrad Rzeszutek Wilk , Robin Murphy , x86@kernel.org, Ram Pai , linux-kernel@vger.kernel.org, Halil Pasic , iommu@lists.linux-foundation.org, Ingo Molnar , Borislav Petkov , "Lendacky, Thomas" , "H. Peter Anvin" , linux-fsdevel@vger.kernel.org, Thomas Gleixner , linuxppc-dev@lists.ozlabs.org, Alexey Dobriyan , Marek Szyprowski Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Christoph Hellwig writes: > On Mon, Jul 15, 2019 at 04:03:17PM +0200, Halil Pasic wrote: >> > I thought about that but couldn't put my finger on a general concept. >> > Is it "guest with memory inaccessible to the host"? >> > >> >> Well, force_dma_unencrypted() is a much better name thatn sev_active(): >> s390 has no AMD SEV, that is sure, but for virtio to work we do need to >> make our dma accessible to the hypervisor. Yes, your "guest with memory >> inaccessible to the host" shows into the right direction IMHO. >> Unfortunately I don't have too many cycles to spend on this right now. > > In x86 it means that we need to remove dma encryption using > set_memory_decrypted before using it for DMA purposes. In the SEV > case that seems to be so that the hypervisor can access it, in the SME > case that Tom just fixes it is because there is an encrypted bit set > in the physical address, and if the device doesn't support a large > enough DMA address the direct mapping code has to encrypt the pages > used for the contigous allocation. > >> Being on cc for your patch made me realize that things got broken on >> s390. Thanks! I've sent out a patch that fixes protvirt, but we are going >> to benefit from your cleanups. I think with your cleanups and that patch >> of mine both sev_active() and sme_active() can be removed. Feel free to >> do so. If not, I can attend to it as well. > > Yes, I think with the dma-mapping fix and this series sme_active and > sev_active should be gone from common code. We should also be able > to remove the exports x86 has for them. > > I'll wait a few days and will then feed the dma-mapping fix to Linus, > it might make sense to either rebase Thiagos series on top of the > dma-mapping for-next branch, or wait a few days before reposting. I'll rebase on top of dma-mapping/for-next and do the break up of patch 2 that you mentioned as well. -- Thiago Jung Bauermann IBM Linux Technology Center