diff options
| author | Avi Kivity <avi@redhat.com> | 2012-08-27 23:46:17 +0300 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2012-08-27 18:38:55 -0300 |
| commit | dd856efafe6097a5c9104725c2bca74430423db8 (patch) | |
| tree | d074a16680f3a39798f372e16426476aa7f6e1df /arch/x86/include/asm/kvm_emulate.h | |
| parent | 66a03505a7fcc70187319ef2318832f4d3c451a6 (diff) | |
| download | linux-stable-dd856efafe6097a5c9104725c2bca74430423db8.tar.gz linux-stable-dd856efafe6097a5c9104725c2bca74430423db8.tar.bz2 linux-stable-dd856efafe6097a5c9104725c2bca74430423db8.zip | |
KVM: x86 emulator: access GPRs on demand
Instead of populating 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 <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/kvm_emulate.h')
| -rw-r--r-- | arch/x86/include/asm/kvm_emulate.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h index c764f43b71c5..282aee5d6ac1 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 */ /* Fields above regs are cleared together. */ - unsigned long regs[NR_VCPU_REGS]; + unsigned long _regs[NR_VCPU_REGS]; struct operand *memopp; struct fetch_cache fetch; struct read_cache io_read; @@ -394,4 +409,7 @@ int emulator_task_switch(struct x86_emulate_ctxt *ctxt, u16 tss_selector, int idt_index, int reason, bool has_error_code, u32 error_code); int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq); +void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt); +void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt); + #endif /* _ASM_X86_KVM_X86_EMULATE_H */ |