Messages in this thread | | | Date | Wed, 8 Apr 2020 10:37:38 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 4/4] x86,module: Detect CRn and DRn manipulation |
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On Wed, Apr 08, 2020 at 02:22:45AM +0200, Paolo Bonzini wrote: > On 08/04/20 01:15, Andrew Cooper wrote: > >> Anyhow, I do not think it is the only use-case which is not covered by your > >> patches (even considering CRs/DRs alone). For example, there is no kernel > >> function to turn on CR4.VMXE, which is required to run hypervisors on x86. > > How about taking this opportunity to see if there is a way to improve on > > the status quo for co-existing hypervisor modules? > > Almost serious question: why? I can understand VMware, but why can't at > least VirtualBox use KVM on Linux? I am not sure if they are still > running device emulation in ring zero, but if so do you really want to > do that these days?
Having had the 'joy' of looking at the virtual-puke^Wbox code recently, nobody with half a hair of sense on their head will want to ever touch that thing again.
It's a security nightmare, and that's the best part of it.
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