On Tue, Aug 07, 2012 at 06:23:01PM -0300, Marcelo Tosatti wrote:
> On Thu, Jul 19, 2012 at 03:14:38PM +0300, Avi Kivity wrote:
> > Instead of populating the the entire register file, read in registers
> > as they are accessed, and write back only the modified ones. This
> > saves a VMREAD and VMWRITE on Intel (for rsp, since it is not usually
> > used during emulation), and a two 128-byte copies for the registers.
> >
> > Signed-off-by: Avi Kivity <a...@redhat.com>
> > ---
> > arch/x86/include/asm/kvm_emulate.h | 17 ++-
> > arch/x86/kvm/emulate.c | 268
> > +++++++++++++++++++++----------------
> > arch/x86/kvm/x86.c | 50 ++++---
> > 3 files changed, 192 insertions(+), 143 deletions(-)
> >
> > diff --git a/arch/x86/include/asm/kvm_emulate.h
> > b/arch/x86/include/asm/kvm_emulate.h
> > index c764f43..2f1da16 100644
> > --- a/arch/x86/include/asm/kvm_emulate.h
> > +++ b/arch/x86/include/asm/kvm_emulate.h
> > @@ -86,6 +86,19 @@ struct x86_instruction_info {
> >
> > struct x86_emulate_ops {
> > /*
> > + * read_gpr: read a general purpose register (rax - r15)
> > + *
> > + * @reg: gpr number.
> > + */
> > + ulong (*read_gpr)(struct x86_emulate_ctxt *ctxt, unsigned reg);
> > + /*
> > + * write_gpr: write a general purpose register (rax - r15)
> > + *
> > + * @reg: gpr number.
> > + * @val: value to write.
> > + */
> > + void (*write_gpr)(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong
> > val);
> > + /*
> > * read_std: Read bytes of standard (non-emulated/special) memory.
> > * Used for descriptor reading.
> > * @addr: [IN ] Linear address from which to read.
> > @@ -281,8 +294,10 @@ struct x86_emulate_ctxt {
> > bool rip_relative;
> > unsigned long _eip;
> > struct operand memop;
> > + u32 regs_valid; /* bitmaps of registers in _regs[] that can be read */
> > + u32 regs_dirty; /* bitmaps of registers in _regs[] that have been
> > written */
>
> emul_regs_dirty (to avoid with the other regs_dirty).
avoid confusion.
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