search for: nonono

On Wed, Oct 28, 2015 at 10:35:27PM +0900, David Woodhouse wrote: > On Wed, 2015-10-28 at 13:35 +0200, Michael S. Tsirkin wrote: > > E.g. on intel x86, there's an option iommu=pt which does the 1:1 > > thing for devices when used by kernel, but enables > > the iommu if used by userspace/VMs. > > That's none of your business. > > You call the DMA API when

On Wed, Oct 28, 2015 at 10:35:27PM +0900, David Woodhouse wrote: > On Wed, 2015-10-28 at 13:35 +0200, Michael S. Tsirkin wrote: > > E.g. on intel x86, there's an option iommu=pt which does the 1:1 > > thing for devices when used by kernel, but enables > > the iommu if used by userspace/VMs. > > That's none of your business. > > You call the DMA API when

...not second-guess it. (From the other mail) > > > OK so I guess that means we should prefer a transport-specific > > > interface in virtio-pci then. > > > > Why? > > Because you said you are doing something device tree specific for > ARM, aren't you? Nonono. The ARM platform code might do that, and the DMA API on ARM *might* give you I/O virtual addresses that look a lot like the physical addresses you asked it to map. That's none of your business. Drivers use DMA API. No more talky. -- dwmw2 -------------- next part -------------- A non-text...

Dear All, I suspect this is kind of dumb, but when I was under the thrall of the dark lord (read, using a W2K box), all my work in R files came out as foo.RData. I moved on to GNU/Linux, and all the old .RData files keep on working as they used. No problems in loading and stuff. But I use R from the terminal. Assuming I decide to switch to emacs, do I need to save my work as foo.r? what about my

...> > > > OK so I guess that means we should prefer a transport-specific > > > > interface in virtio-pci then. > > > > > > Why? > > > > Because you said you are doing something device tree specific for > > ARM, aren't you? > > Nonono. The ARM platform code might do that, and the DMA API on ARM > *might* give you I/O virtual addresses that look a lot like the > physical addresses you asked it to map. That's none of your business. > Drivers use DMA API. No more talky. Well for virtio they don't ATM. And 1:1 mapp...

...> > > > OK so I guess that means we should prefer a transport-specific > > > > interface in virtio-pci then. > > > > > > Why? > > > > Because you said you are doing something device tree specific for > > ARM, aren't you? > > Nonono. The ARM platform code might do that, and the DMA API on ARM > *might* give you I/O virtual addresses that look a lot like the > physical addresses you asked it to map. That's none of your business. > Drivers use DMA API. No more talky. Well for virtio they don't ATM. And 1:1 mapp...

...tead evaluate the threshold in software, based on an override option Another thing that took me a while was to realize, how the whole graceful shutdown process is going. The process isn't nearly as straightforward as it may seem at a first glance: "Battery low, SNAP, lights out". Nonono. The sequence is described in quite some detail in official documentation (link to "configuration notes" follows below). In rough outlines, in a standalone setup, the process goes like: 1) the power goes out, which the UPS signals to the server. You get a message on the console and...