Re: [PATCH] reserved-ram for pci-passthrough without VT-d capable hardware

[Andrea Arcangeli <andrea@qumranet.com>]

On Wed, Jul 30, 2008 at 05:16:06PM +0300, Dor Laor wrote:
> In addition KVM is used in embedded too and things are slower there, we 
> know of a specific use case (production) that demands
> 1:1 mapping and can't use VT-d

Since you mentioned this ;), I take opportunity to add that those
embedded usages are the ones that are totally fine with the compile
time passthrough-guest-ram decision, instead of a boot time
decision. Those host kernels will likely have RT patches (KVM works
great with preempt-RT indeed) and in turn the compile time ram
selection is the least of their problems as you can imagine ;). So you
can see my patch as an embedded-build option, similar to "Configure
standard kernel features (for small systems)" and no distro is
shipping new kernels with that feature on either.

Than if we decide 1:1 should have larger userbase instead of only the
people that knows what they're doing (i.e. 1:1 guest can destroy
linux-hypervisor) we can always add a bit of strtol parsing to 16bit
kernelloader.