AVX

[Yamagi Burmeister]

Hi,
I've tested your patch on a Core2Duo with XSAVE but (of course) without
AVX on 10-CURRENT as of today (r229812):

CPU: Intel(R) Core(TM)2 Duo CPU     T6670  @ 2.20GHz (2194.55-MHz
K8-class CPU) Origin = "GenuineIntel"  Id = 0x1067a  Family = 6  Model
  = 17  Stepping = 10
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,
  MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0x408e3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,
  PDCM,SSE4.1,XSAVE>
AMD Features=0x20100800<SYSCALL,NX,LM> AMD Features2=0x1<LAHF> 

Everything's fine:
- System is booting without a problem
- All applications are working
- AVX applications are still failing with SIGILL

But there's one problem: While a shutdown (shutdown -p now) is always
successfull a reboot (shutdown -r now) and suspend (zzz) are resulting 
in a double panic. The first panic is a "Fatal trap 9: general
protection fault while in kernel mode" on "cpuid = 1; apic id = 01".
The process is always "idle: cpu1".

The second panic is also "Fatal trap 9: general protection fault while
in kernel mode" but with "cpuid = 0; apic id = 00". The process is
always "init". 

Since it's a dual core cpu, one panic for each processor core? 

I'm unable to get a core dump and ddb is unresponsive to any keyboard
input. A serial console is unavailable, since it's a laptop...
Nevertheless I've uploaded screenshots of both panics to:
 
 http://deponie.yamagi.org/freebsd/debug/avx 


On Mon, 2 Jan 2012 08:37:00 +0200
Kostik Belousov <kostikbel at gmail.com> wrote:

> The patch
> http://people.freebsd.org/~kib/misc/avx.2.patch
> is the commit candidate. Compared with avx.1.patch, it includes
> several bugfixes, some move of code around, and finishes the
> implementation of getcontextx(3) for non-x86 architectures.
> 
> Please note that variant of getcontextx() is required for deferred
> signal delivery from libthr. This is the reason for Cc:ing sparc64@,
> could somebody test the patch on this architecture ? I used the
> http://people.freebsd.org/~kib/misc/defer_sig.c to test deferred
> delivery on amd64.
> 
> Another missed testing point is machines capable of XSAVE but lacking
> AVX extensions. I think most Core2 fall into this category, but my Core2
> machine is disassembled. Could anybody test the patch on non-SandyBridge
> machine having XSAVE support ? You can check the capability using
> ports/sysutils/x86info or looking at the early boot Features2 line,
> which shall contain the XSAVE.


-- 
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