PR/57661 CVS commit: src/sys/arch/x86/x86

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

The following reply was made to PR port-amd64/57661; it has been noted by GNATS.

From: "Taylor R Campbell" <riastradh%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/57661 CVS commit: src/sys/arch/x86/x86
Date: Wed, 14 May 2025 23:39:01 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Wed May 14 23:39:01 UTC 2025
 
 Modified Files:
 	src/sys/arch/x86/x86: fpu.c
 
 Log Message:
 x86/fpu.c: Revert unnecessary part of rev. 1.90.
 
 Most of the changes including x86/fpu.c rev. 1.90 served to support a
 separately allocated XSAVE area in each thread's pcb.  On machines
 with large XSAVE areas, the fpu.c changes also:
 
 1. allocated a separate area for fpuinit_mxcsr_mask, and
 
 2. allocated a separate area for the safe/zero states of
    fpu_kern_enter/leave.
 
 But (1) is unnecessary because we uncondiitonally use FXSAVE for
 that, for which union savefpu is enough -- actually, struct fxsave
 (exactly 512 bytes) is enough.  To be done in a separate change.
 
 PR port-amd64/57661: Crash when booting on Xeon Silver 4416+ in
 KVM/Qemu
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.91 -r1.92 src/sys/arch/x86/x86/fpu.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.