Thanks, all, The general view from last week is to pursue an ACPI table that indicates that the SWIOTLB isn't needed. I'll work with our local ACPI experts on table format. For existing guests, we'll work on language suggesting kernel command line options (iommu=off) if people are concerned, and will look into doing the command line setting in our own provided images. On Thu, Aug 25, 2016 at 7:45 PM, Wanpeng Li <kernellwp@xxxxxxxxx> wrote: > 2016-08-26 9:16 GMT+08:00 Yang Zhang <yang.zhang.wz@xxxxxxxxx>: >> On 2016/8/24 22:36, Benjamin Serebrin wrote: >>> >>> iommu=off would kill the SWIOTLB as well, while swiotlb=1 consumes 1MB. >>> >>> However, maintaining guests' kernel commandlines is something we'd >>> like to stay away from if possible. It's certainly a short-term >> >> >> I don't quite understand why stay away from kernel command line. It provides >> more flexibility, allowing you to turn on/off it by yourself. > > I agree with Benjamin, it will result in customers have to tune their > guest OSes kernel command line or we supply guest images w/ kernel > command line modification. > > Regards, > Wanpeng Li > >> >> >>> answer, or something individual customers can choose to do today. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
