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Biederman" , Anthony Yznaga , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, mhocko@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, arnd@arndb.de, keescook@chromium.org, gerg@linux-m68k.org, ktkhai@virtuozzo.com, christian.brauner@ubuntu.com, peterz@infradead.org, esyr@redhat.com, christian@kellner.me, areber@redhat.com, cyphar@cyphar.com References: <20200730152250.GG23808@casper.infradead.org> <20200730171251.GI23808@casper.infradead.org> <63a7404c-e4f6-a82e-257b-217585b0277f@oracle.com> <20200730174956.GK23808@casper.infradead.org> <87y2n03brx.fsf@x220.int.ebiederm.org> <689d6348-6029-5396-8de7-a26bc3c017e5@oracle.com> <20200731152736.GP23808@casper.infradead.org> <9ba26063-0098-e796-9431-8c1d0c076ffc@oracle.com> <20200731165649.GG24045@ziepe.ca> From: Steven Sistare Organization: Oracle Corporation Message-ID: <71ddd3c1-bb59-3e63-e137-99b88ace454d@oracle.com> Date: Fri, 31 Jul 2020 13:15:34 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <20200731165649.GG24045@ziepe.ca> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9699 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 mlxscore=0 adultscore=0 spamscore=0 phishscore=0 mlxlogscore=999 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007310129 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9699 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 bulkscore=0 suspectscore=0 spamscore=0 impostorscore=0 clxscore=1015 phishscore=0 priorityscore=1501 adultscore=0 mlxlogscore=999 malwarescore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007310129 X-Rspamd-Queue-Id: 9A4481804E3A8 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 7/31/2020 12:56 PM, Jason Gunthorpe wrote: > On Fri, Jul 31, 2020 at 12:11:52PM -0400, Steven Sistare wrote: >>> Your preservation-across-exec use-case might or might not need the >>> VMA to be mapped at the same address. >> >> It does. qemu registers memory with vfio which remembers the va's in kernel >> metadata for the device. > > Once the memory is registered with vfio the VA doesn't matter, vfio > will keep the iommu pointing at the same physical pages no matter > where they are mapped. Yes, but there are other code paths that compute and use offsets between va and the base va. Mapping at a different va in the new process breaks vfio; I have tried it. - Steve