Hi Tom, On 02/17/17 at 10:43am, Tom Lendacky wrote: > On 2/17/2017 9:57 AM, Konrad Rzeszutek Wilk wrote: > > On Thu, Feb 16, 2017 at 09:47:55AM -0600, Tom Lendacky wrote: > > > Provide support so that kexec can be used to boot a kernel when SME is > > > enabled. > > > > Is the point of kexec and kdump to ehh, dump memory ? But if the > > rest of the memory is encrypted you won't get much, will you? > > Kexec can be used to reboot a system without going back through BIOS. > So you can use kexec without using kdump. > > For kdump, just taking a quick look, the option to enable memory > encryption can be provided on the crash kernel command line and then Is there a simple way to get the SME status? Probably add some sysfs file for this purpose. > crash kernel can would be able to copy the memory decrypted if the > pagetable is set up properly. It looks like currently ioremap_cache() > is used to map the old memory page. That might be able to be changed > to a memremap() so that the encryption bit is set in the mapping. That > will mean that memory that is not marked encrypted (EFI tables, swiotlb > memory, etc) would not be read correctly. Manage to store info about those ranges which are not encrypted so that memremap can handle them? > > > > > Would it make sense to include some printk to the user if they > > are setting up kdump that they won't get anything out of it? > > Probably a good idea to add something like that. It will break kdump functionality, it should be fixed instead of just adding printk to warn user.. Thanks Dave
