Re: [EXTERNAL][PATCH v2] KVM: x86/xen: Implement hvm_op/HVMOP_flush_tlbs hypercall

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On Tue, 2023-04-18 at 16:47 +0100, David Woodhouse wrote:
> 
> Oh, that suckage is quite high indeed. I'm not actually sure I'll
> bother doing this in QEMU. It's quite esoteric; Linux has never used it
> and I think that after launching <mumble> million production Xen guests
> this way we've only ever seen it used by some FreeBSD variant.
> 
> It doesn't seem to be in mainline FreeBSD; there's a hint of it here
> https://people.freebsd.org/~dfr/freebsd-6.x-xen-31032009.diff for
> example but it's disabled even then:

For the record, Metin and Paul tell me I lied; it was actually seen
with a Windows guest using the ancient closed-source Citrix drivers.

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