[PATCH v3 12/20] KVM: x86: Support EGPR accessing and tracking for emulator

["Chang S. Bae" <chang.seok.bae@intel.com>]

Extend the emulator context and GPR accessors to handle EGPRs before
adding support for REX2-prefixed instructions. Like VCPU cache, the
emulator can uniformly cache and track all GPRs.

Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
---
V2 -> V3: Increase GPR number by CONFIG_KVM_APX=y (Sean)
---
 arch/x86/kvm/kvm_emulate.h | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index 0abff36d0994..b722bf20a59b 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -105,13 +105,13 @@ struct x86_instruction_info {
 struct x86_emulate_ops {
 	void (*vm_bugged)(struct x86_emulate_ctxt *ctxt);
 	/*
-	 * read_gpr: read a general purpose register (rax - r15)
+	 * read_gpr: read a general purpose register (rax - r31)
 	 *
 	 * @reg: gpr number.
 	 */
 	ulong (*read_gpr)(struct x86_emulate_ctxt *ctxt, unsigned reg);
 	/*
-	 * write_gpr: write a general purpose register (rax - r15)
+	 * write_gpr: write a general purpose register (rax - r31)
 	 *
 	 * @reg: gpr number.
 	 * @val: value to write.
@@ -315,7 +315,9 @@ typedef void (*fastop_t)(struct fastop *);
  * also uses _eip, RIP cannot be a register operand nor can it be an operand in
  * a ModRM or SIB byte.
  */
-#ifdef CONFIG_X86_64
+#if defined(CONFIG_KVM_APX)
+#define NR_EMULATOR_GPRS	32
+#elif defined(CONFIG_X86_64)
 #define NR_EMULATOR_GPRS	16
 #else
 #define NR_EMULATOR_GPRS	8
@@ -375,9 +377,9 @@ struct x86_emulate_ctxt {
 	u8 lock_prefix;
 	u8 rep_prefix;
 	/* bitmaps of registers in _regs[] that can be read */
-	u16 regs_valid;
+	u32 regs_valid;
 	/* bitmaps of registers in _regs[] that have been written */
-	u16 regs_dirty;
+	u32 regs_dirty;
 	/* modrm */
 	u8 modrm;
 	u8 modrm_mod;
-- 
2.51.0