git: nvmm(4): Fix the XSAVE area size

[Aaron LI]

commit 0d1bb899f923a47c114c141692d1f1db237c02b1
Author: Aaron LI <aly at aaronly.me>
Date:   Thu Aug 6 07:43:29 2026 +0800

    nvmm(4): Fix the XSAVE area size
    
    - Fix nvmm_x86_xsave_size(): x87/SSE are in the legacy region, and the
      size of that region is constant regardless of whether SSE is enabled.
    
    - When XSAVEC is supported, CPUID leaf 0x0000000D:ECX=1[EBX] is supposed
      to return the current XSAVE area size, but NVMM mistakenly returns
      zero. Given that NVMM supports only x87/SSE, XSAVEC is useless, so
      rather than fixing the EBX return value, just don't advertise XSAVEC.
    
    Credit: Maxime Villard (m00nbsd)

Summary of changes:
 sys/dev/virtual/nvmm/x86/nvmm_x86.c     | 13 +++++++------
 sys/dev/virtual/nvmm/x86/nvmm_x86_svm.c |  1 -
 sys/dev/virtual/nvmm/x86/nvmm_x86_vmx.c |  1 -
 3 files changed, 7 insertions(+), 8 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/0d1bb899f923a47c114c141692d1f1db237c02b1


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