On Thu, Feb 20, 2020 at 07:58:45PM +0000, Andrew Cooper wrote: > A splitlock is an atomic operation which crosses a cache line boundary. It > serialises operations in the cache coherency fabric and comes with a > multi-thousand cycle stall. > > Intel Tremont CPUs introduce MSR_CORE_CAPS to enumerate various core-specific > features, and MSR_TEST_CTRL to adjust the behaviour in the case of a > splitlock. > > Virtualising this for guests is distinctly tricky owing to the fact that > MSR_TEST_CTRL has core rather than thread scope. In the meantime however, > prevent the MSR values leaking into guests. > > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Reviewed-by: Wei Liu <w...@xen.org> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
