On 27/06/2019 20:41, Igor Druzhinin wrote:
> This fixes booting of old non-PV-OPS kernels which historically
> looked for OSXSAVE instead of XSAVE bit in CPUID to check whether
> XSAVE feature is enabled. If such a guest appears to be started on
> an XSAVE enabled CPU and the feature is explicitly cleared in
> policy, leaked OSXSAVE bit from Xen will lead to guest crash early in
> boot.
>
> Signed-off-by: Igor Druzhinin <igor.druzhi...@citrix.com>

Reviewed-by: Andrew Cooper <andrew.coop...@citrix.com>

Yes - this one aspect of the gigantic mess which is PV guests and XSAVE
which I overlooked when coming up with the existing gross bodge.

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