On Tue, Jan 16, 2024 at 03:25:47PM +0000, Michael Kelley wrote: > From: Saurabh Sengar <ssengar@xxxxxxxxxxxxxxxxxxx> Sent: Monday, January 15, 2024 9:58 AM > > > > The current method for signaling the compatibility of a Hyper-V host > > with MSIs featuring 15-bit APIC IDs relies on a synthetic cpuid leaf. > > However, for higher VTLs, this leaf is not reported, due to the absence > > of an IO-APIC. > > > > As an alternative, assume that when running at a high VTL, the host > > supports 15-bit APIC IDs. This assumption is safe, as Hyper-V does not > > employ any architectural MSIs at higher VTLs > > > > This unblocks startup of VTL2 environments with more than 256 CPUs. > > > > Signed-off-by: Saurabh Sengar <ssengar@xxxxxxxxxxxxxxxxxxx> [...] > > Reviewed-by: Michael Kelley <mhklinux@xxxxxxxxxxx> Applied. Thanks.
