diff options
| author | Andreas Sandberg <andreas@sandberg.pp.se> | 2013-09-30 09:43:43 +0200 |
|---|---|---|
| committer | Andreas Sandberg <andreas@sandberg.pp.se> | 2013-09-30 09:43:43 +0200 |
| commit | 86bade714e86fa87f8a210cdf0ec799f965f90a4 (patch) | |
| tree | c966a6b5177510b4d58d21be6db47f1a094c2bde /src/cpu/kvm/X86KvmCPU.py | |
| parent | cccca70149d585d03ea5613c672ceebf00ec36f7 (diff) | |
| download | gem5-86bade714e86fa87f8a210cdf0ec799f965f90a4.tar.xz | |
kvm: FPU synchronization support on x86
This changeset adds support for synchronizing the FPU and SIMD state
of a virtual x86 CPU with gem5. It supports both the XSave API and the
KVM_(GET|SET)_FPU kernel API. The XSave interface can be disabled
using the useXSave parameter (in case of kernel
issues). Unfortunately, KVM_(GET|SET)_FPU interface seems to be buggy
in some kernels (specifically, the MXCSR register isn't always
synchronized), which means that it might not be possible to
synchronize MXCSR on old kernels without the XSave interface.
This changeset depends on the __float80 type in gcc and might not
build using llvm.
Diffstat (limited to 'src/cpu/kvm/X86KvmCPU.py')
| -rw-r--r-- | src/cpu/kvm/X86KvmCPU.py | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/cpu/kvm/X86KvmCPU.py b/src/cpu/kvm/X86KvmCPU.py index 0b12da676..18a4d3d6f 100644 --- a/src/cpu/kvm/X86KvmCPU.py +++ b/src/cpu/kvm/X86KvmCPU.py @@ -43,3 +43,5 @@ class X86KvmCPU(BaseKvmCPU): void dumpXSave(); void dumpVCpuEvents(); ''') + + useXSave = Param.Bool(True, "Use XSave to synchronize FPU/SIMD registers") |