KVM: x86 emulator: access GPRs on demand

[deliverable/linux.git] / arch / x86 / include / asm / kvm_emulate.h

diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index c764f43b71c5c851f46be710023d4945f1df3c76..282aee5d6ac1f662f5791b536884dff21b63b279 100644 (file)
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -85,6 +85,19 @@ struct x86_instruction_info {
 #define X86EMUL_INTERCEPTED     6 /* Intercepted by nested VMCB/VMCS */
 
 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.
@@ -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 */