re: port-amd64/59860: nvmm: support AVX2, AVX512, &c.

["matthew green via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR port-amd64/59860; it has been noted by GNATS.

From: matthew green <mrg%eterna23.net@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: port-amd64-maintainer%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
    netbsd-bugs%netbsd.org@localhost, campbell+netbsd%mumble.net@localhost
Subject: re: port-amd64/59860: nvmm: support AVX2, AVX512, &c.
Date: Mon, 13 Jul 2026 10:15:00 +1000

 i seems to have gotten past that with a simple mask in vmx_init():
 
 -	vmx_xcr0_mask = x86_xsave_features;
 +	vmx_xcr0_mask = x86_xsave_features & __BITS(XSAVE_MAX_COMPONENT, 0);
 
 not sure why, but my cpu ends up with XCR0_PKRU set here (i mean,
 the cpu has it, but do we otherwise support it?)
 
 it seems to work with that fix:
 
 cpu0: xsave features 0x7<x87,SSE,AVX>
 
 from the guest.  it seems to work:
 
 # cd /usr/tests/kernel
 # atf-run t_signal_and_fpu
 ....
 tc-start: 1783901653.490927, xmm
 tc-end: 1783901655.349492, xmm, passed
 tc-start: 1783901655.350912, ymm
 tc-end: 1783901657.349512, ymm, passed
 tp-end: 1783901657.350932, t_signal_and_fpu
 info: time.end, Mon Jul 13 00:14:17 UTC 2026
 
 
 .mrg.