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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 12 Jul 2019 22:55:57 +0100 Received: from b01ledav005.gho.pok.ibm.com (b01ledav005.gho.pok.ibm.com [9.57.199.110]) by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x6CLtupx10814168 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 12 Jul 2019 21:55:56 GMT Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 95FB3AE062; Fri, 12 Jul 2019 21:55:56 +0000 (GMT) Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0522EAE05F; Fri, 12 Jul 2019 21:55:51 +0000 (GMT) Received: from morokweng.localdomain (unknown [9.85.135.203]) by b01ledav005.gho.pok.ibm.com (Postfix) with ESMTPS; Fri, 12 Jul 2019 21:55:51 +0000 (GMT) References: <20190712053631.9814-1-bauerman@linux.ibm.com> <20190712053631.9814-4-bauerman@linux.ibm.com> <20190712150912.3097215e.pasic@linux.ibm.com> User-agent: mu4e 1.2.0; emacs 26.2 From: Thiago Jung Bauermann To: Halil Pasic Subject: Re: [PATCH 3/3] fs/core/vmcore: Move sev_active() reference to x86 arch code In-reply-to: <20190712150912.3097215e.pasic@linux.ibm.com> Date: Fri, 12 Jul 2019 18:55:47 -0300 MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 x-cbid: 19071221-2213-0000-0000-000003ADCDAE X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011417; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000286; SDB=6.01231280; UDB=6.00648610; IPR=6.01012564; MB=3.00027695; MTD=3.00000008; XFM=3.00000015; UTC=2019-07-12 21:56:01 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19071221-2214-0000-0000-00005F35B676 Message-Id: <87tvbqgboc.fsf@morokweng.localdomain> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-07-12_06:, , 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-1907120224 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 , Konrad Rzeszutek Wilk , Robin Murphy , x86@kernel.org, Ram Pai , linux-kernel@vger.kernel.org, Alexey Dobriyan , 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, Christoph Hellwig , Marek Szyprowski Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" [ Cc'ing Tom Lendacky which I forgot to do earlier. Sorry about that. ] Hello Halil, Thanks for the quick review. Halil Pasic writes: > On Fri, 12 Jul 2019 02:36:31 -0300 > Thiago Jung Bauermann wrote: > >> Secure Encrypted Virtualization is an x86-specific feature, so it shouldn't >> appear in generic kernel code because it forces non-x86 architectures to >> define the sev_active() function, which doesn't make a lot of sense. > > sev_active() might be just bad (too specific) name for a general > concept. s390 code defines it drives the right behavior in > kernel/dma/direct.c (which uses it). I thought about that but couldn't put my finger on a general concept. Is it "guest with memory inaccessible to the host"? Since your proposed definiton for force_dma_unencrypted() is simply to make it equivalent to sev_active(), I thought it was more straightforward to make each arch define force_dma_unencrypted() directly. Also, does sev_active() drive the right behavior for s390 in elfcorehdr_read() as well? >> To solve this problem, add an x86 elfcorehdr_read() function to override >> the generic weak implementation. To do that, it's necessary to make >> read_from_oldmem() public so that it can be used outside of vmcore.c. >> >> Signed-off-by: Thiago Jung Bauermann >> --- >> arch/x86/kernel/crash_dump_64.c | 5 +++++ >> fs/proc/vmcore.c | 8 ++++---- >> include/linux/crash_dump.h | 14 ++++++++++++++ >> include/linux/mem_encrypt.h | 1 - >> 4 files changed, 23 insertions(+), 5 deletions(-) > > Does not seem to apply to today's or yesterdays master. It assumes the presence of the two patches I mentioned in the cover letter. Only one of them is in master. I hadn't realized the s390 virtio patches were on their way to upstream. I was keeping an eye on the email thread but didn't see they were picked up in the s390 pull request. I'll add a new patch to this series making the corresponding changes to s390's as well. -- Thiago Jung Bauermann IBM Linux Technology Center