KVM: x86 emulator: implement 'jmp rel' instruction (opcode 0xe9)

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 2b94d16e9d23..fa7aa278956f 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -145,8 +145,10 @@ static u8 opcode_table[256] = {
         0, 0, 0, 0,
         /* 0xD8 - 0xDF */
         0, 0, 0, 0, 0, 0, 0, 0,
-        /* 0xE0 - 0xEF */
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+        /* 0xE0 - 0xE7 */
+        0, 0, 0, 0, 0, 0, 0, 0,
+        /* 0xE8 - 0xEF */
+        0, SrcImm|ImplicitOps, 0, 0, 0, 0, 0, 0,
         /* 0xF0 - 0xF7 */
         0, 0, 0, 0,
         ImplicitOps, 0,
@@ -447,6 +449,12 @@ struct operand {
                            (((reg) + _inc) & ((1UL << (ad_bytes << 3)) - 1)); \
         } while (0)
 
+#define JMP_REL(rel)                                                    \
+        do {                                                            \
+                _eip += (int)(rel);                                     \
+                _eip = ((op_bytes == 2) ? (uint16_t)_eip : (uint32_t)_eip); \
+        } while (0)
+
 /*
  * Given the 'reg' portion of a ModRM byte, and a register block, return a
  * pointer into the block that addresses the relevant register.
@@ -1023,6 +1031,10 @@ done_prefixes:
         case 0xd2 ... 0xd3:     /* Grp2 */
                 src.val = _regs[VCPU_REGS_RCX];
                 goto grp2;
+        case 0xe9: /* jmp rel */
+                JMP_REL(src.val);
+                no_wb = 1; /* Disable writeback. */
+                break;
         case 0xf6 ... 0xf7:     /* Grp3 */
                 switch (modrm_reg) {
                 case 0 ... 1:   /* test */