Messages in this thread | | | From | Hans Rosenfeld <> | Subject | [RFC v2 0/8] x86, xsave: rework of extended state handling, LWP support | Date | Wed, 23 Mar 2011 16:27:39 +0100 |
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Changes since last patch set: * fixed race in signal return path that could lead to xstate corruptions * avoid LWP state inconsitency after signal return by disabling LWP when entering a signal handler
This patch set is a general cleanup and rework of the code related to handling of FPU and other extended states.
All handling of extended states, including the FPU state, is now handled by xsave/xrstor wrappers that fall back to fxsave/fxrstor, or even fsave/frstor, if hardware support for those features is lacking.
Non-lazy xstates, which cannot be restored lazily, can now be easily supported with almost no processing overhead. This makes adding basic support for AMDs LWP almost trivial.
Since non-lazy xstates are inherently incompatible with lazy allocation of the xstate area, the complete removal of lazy allocation to further reduce code complexity should be considered. Since SSE-optimized library functions are widely used today, most processes will have an xstate area anyway, so the memory overhead wouldn't be big enough to be much of an issue.
Hans Rosenfeld (8): x86, xsave: cleanup fpu/xsave support x86, xsave: rework fpu/xsave support x86, xsave: cleanup fpu/xsave signal frame setup x86, xsave: remove unused code x86, xsave: more cleanups x86, xsave: add support for non-lazy xstates x86, xsave: add kernel support for AMDs Lightweight Profiling (LWP) x86, xsave: remove lazy allocation of xstate area
arch/x86/ia32/ia32_signal.c | 4 +- arch/x86/include/asm/i387.h | 243 ++++++++-------------------- arch/x86/include/asm/msr-index.h | 1 + arch/x86/include/asm/processor.h | 12 ++ arch/x86/include/asm/sigcontext.h | 12 ++ arch/x86/include/asm/thread_info.h | 4 +- arch/x86/include/asm/xsave.h | 100 +++---------- arch/x86/kernel/i387.c | 310 ++++-------------------------------- arch/x86/kernel/process_32.c | 29 ++--- arch/x86/kernel/process_64.c | 28 +--- arch/x86/kernel/signal.c | 4 +- arch/x86/kernel/traps.c | 47 +----- arch/x86/kernel/xsave.c | 311 +++++++++++++++++++++++------------- arch/x86/kvm/vmx.c | 2 +- arch/x86/kvm/x86.c | 11 +- arch/x86/math-emu/fpu_entry.c | 8 +- drivers/lguest/x86/core.c | 2 +- 17 files changed, 380 insertions(+), 748 deletions(-)
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