From mboxrd@z Thu Jan 1 00:00:00 1970 From: Borislav Petkov Subject: Re: [PATCH 1/5 V5] Add a function(ioremap_encrypted) for kdump when AMD sme enabled Date: Mon, 9 Jul 2018 11:29:01 +0200 Message-ID: <20180709092901.GA22182@nazgul.tnic> References: <20180702072639.10110-1-lijiang@redhat.com> <20180702072639.10110-2-lijiang@redhat.com> <20180702101451.GB28730@zn.tnic> <4ae1cfb5-0a4b-2aac-2575-024e2c74826f@redhat.com> <895db996-febd-d50c-91af-4f1ef3d27bd8@redhat.com> <20180703111428.GB5748@zn.tnic> <4fbb843b-9597-a48b-8b6f-00e354b91950@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: lijiang Cc: thomas.lendacky-5C7GfCeVMHo@public.gmane.org, kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org, hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org List-Id: iommu@lists.linux-foundation.org On Mon, Jul 09, 2018 at 02:28:11PM +0800, lijiang wrote: > Last week, I had tried many ways to do this work, but it looks > like that the ways of deducing address is not suitable to another > scenarios, such as mapping some devices mmio space, which are > unencrypted, and the device mmio space is outside kdump kernel like > the old memory, but the old memory is encrypted, we can't find the > general rules to decide when to encrypt or not. If we can't find the "general rules" how is the caller supposed to know how to access the memory? -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. --