KVM: x86: Distinguish between stack operation and near branches

In 64-bit, stack operations default to 64-bits, but can be overriden (to
16-bit) using opsize override prefix. In contrast, near-branches are always
64-bit.  This patch distinguish between the different behaviors.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 147f3fd..a90fa18 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -166,6 +166,7 @@
 #define CheckPerm   ((u64)1 << 49)  /* Has valid check_perm field */
 #define NoBigReal   ((u64)1 << 50)  /* No big real mode */
 #define PrivUD      ((u64)1 << 51)  /* #UD instead of #GP on CPL > 0 */
+#define NearBranch  ((u64)1 << 52)  /* Near branches */
 
 #define DstXacc     (DstAccLo | SrcAccHi | SrcWrite)
 
@@ -3771,9 +3772,9 @@ static const struct opcode group4[] = {
 static const struct opcode group5[] = {
        F(DstMem | SrcNone | Lock,              em_inc),
        F(DstMem | SrcNone | Lock,              em_dec),
-       I(SrcMem | Stack,                       em_call_near_abs),
+       I(SrcMem | NearBranch,                  em_call_near_abs),
        I(SrcMemFAddr | ImplicitOps | Stack,    em_call_far),
-       I(SrcMem | Stack,                       em_jmp_abs),
+       I(SrcMem | NearBranch,                  em_jmp_abs),
        I(SrcMemFAddr | ImplicitOps,            em_jmp_far),
        I(SrcMem | Stack,                       em_push), D(Undefined),
 };
@@ -3955,7 +3956,7 @@ static const struct opcode opcode_table[256] = {
        I2bvIP(DstDI | SrcDX | Mov | String | Unaligned, em_in, ins, check_perm_in), /* insb, insw/insd */
        I2bvIP(SrcSI | DstDX | String, em_out, outs, check_perm_out), /* outsb, outsw/outsd */
        /* 0x70 - 0x7F */
-       X16(D(SrcImmByte)),
+       X16(D(SrcImmByte | NearBranch)),
        /* 0x80 - 0x87 */
        G(ByteOp | DstMem | SrcImm, group1),
        G(DstMem | SrcImm, group1),
@@ -3994,8 +3995,8 @@ static const struct opcode opcode_table[256] = {
        X8(I(DstReg | SrcImm64 | Mov, em_mov)),
        /* 0xC0 - 0xC7 */
        G(ByteOp | Src2ImmByte, group2), G(Src2ImmByte, group2),
-       I(ImplicitOps | Stack | SrcImmU16, em_ret_near_imm),
-       I(ImplicitOps | Stack, em_ret),
+       I(ImplicitOps | NearBranch | SrcImmU16, em_ret_near_imm),
+       I(ImplicitOps | NearBranch, em_ret),
        I(DstReg | SrcMemFAddr | ModRM | No64 | Src2ES, em_lseg),
        I(DstReg | SrcMemFAddr | ModRM | No64 | Src2DS, em_lseg),
        G(ByteOp, group11), G(0, group11),
@@ -4015,13 +4016,14 @@ static const struct opcode opcode_table[256] = {
        /* 0xD8 - 0xDF */
        N, E(0, &escape_d9), N, E(0, &escape_db), N, E(0, &escape_dd), N, N,
        /* 0xE0 - 0xE7 */
-       X3(I(SrcImmByte, em_loop)),
-       I(SrcImmByte, em_jcxz),
+       X3(I(SrcImmByte | NearBranch, em_loop)),
+       I(SrcImmByte | NearBranch, em_jcxz),
        I2bvIP(SrcImmUByte | DstAcc, em_in,  in,  check_perm_in),
        I2bvIP(SrcAcc | DstImmUByte, em_out, out, check_perm_out),
        /* 0xE8 - 0xEF */
-       I(SrcImm | Stack, em_call), D(SrcImm | ImplicitOps),
-       I(SrcImmFAddr | No64, em_jmp_far), D(SrcImmByte | ImplicitOps),
+       I(SrcImm | NearBranch, em_call), D(SrcImm | ImplicitOps | NearBranch),
+       I(SrcImmFAddr | No64, em_jmp_far),
+       D(SrcImmByte | ImplicitOps | NearBranch),
        I2bvIP(SrcDX | DstAcc, em_in,  in,  check_perm_in),
        I2bvIP(SrcAcc | DstDX, em_out, out, check_perm_out),
        /* 0xF0 - 0xF7 */
@@ -4081,7 +4083,7 @@ static const struct opcode twobyte_table[256] = {
        N, N, N, N,
        N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f),
        /* 0x80 - 0x8F */
-       X16(D(SrcImm)),
+       X16(D(SrcImm | NearBranch)),
        /* 0x90 - 0x9F */
        X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)),
        /* 0xA0 - 0xA7 */
@@ -4550,7 +4552,7 @@ done_prefixes:
                return EMULATION_FAILED;
 
        if (unlikely(ctxt->d &
-                    (NotImpl|Stack|Op3264|Sse|Mmx|Intercept|CheckPerm))) {
+           (NotImpl|Stack|Op3264|Sse|Mmx|Intercept|CheckPerm|NearBranch))) {
                /*
                 * These are copied unconditionally here, and checked unconditionally
                 * in x86_emulate_insn.
@@ -4561,8 +4563,12 @@ done_prefixes:
                if (ctxt->d & NotImpl)
                        return EMULATION_FAILED;
 
-               if (mode == X86EMUL_MODE_PROT64 && (ctxt->d & Stack))
-                       ctxt->op_bytes = 8;
+               if (mode == X86EMUL_MODE_PROT64) {
+                       if (ctxt->op_bytes == 4 && (ctxt->d & Stack))
+                               ctxt->op_bytes = 8;
+                       else if (ctxt->d & NearBranch)
+                               ctxt->op_bytes = 8;
+               }
 
                if (ctxt->d & Op3264) {
                        if (mode == X86EMUL_MODE_PROT64)