Re: [PATCH] KVM: PPC: Book3S HV: H_ENTER filter out reserved HPTE[B] value

On Tue, 5 Oct 2021 00:57:49 +1000, Nicholas Piggin wrote:

The HPTE B field is a 2-bit field with values 0b10 and 0b11 reserved.
This field is also taken from the HPTE and used when KVM executes
TLBIEs to set the B field of those instructions.

Disallow the guest setting B to a reserved value with H_ENTER by
rejecting it. This is the same approach already taken for rejecting
reserved (unsupported) LLP values. This prevents the guest from being
able to induce the host to execute TLBIE with reserved values, which
is not known to be a problem with current processors but in theory it
could prevent the TLBIE from working correctly in a future processor.

[...]

Applied to powerpc/next.

[1/1] KVM: PPC: Book3S HV: H_ENTER filter out reserved HPTE[B] value
      https://git.kernel.org/powerpc/c/322fda0405fecaaa540b0fa90393830aaadaf420

cheers