[PATCH 2/6] kvm, emulator: Use opcode length

[Borislav Petkov]

From: Borislav Petkov <b...@suse.de>

Add a field to the current emulation context which contains the
instruction opcode length. This will streamline handling of opcodes of
different length.

Signed-off-by: Borislav Petkov <b...@suse.de>
---
 arch/x86/include/asm/kvm_emulate.h | 8 ++++++--
 arch/x86/kvm/emulate.c             | 5 +++--
 arch/x86/kvm/x86.c                 | 4 ++--
 3 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/kvm_emulate.h 
b/arch/x86/include/asm/kvm_emulate.h
index 15f960c06ff7..92a176ad456c 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -279,8 +279,12 @@ struct x86_emulate_ctxt {
        bool have_exception;
        struct x86_exception exception;
 
-       /* decode cache */
-       u8 twobyte;
+       /*
+        * decode cache
+        */
+
+       /* current opcode length in bytes */
+       u8 opcode_len;
        u8 b;
        u8 intercept;
        u8 lock_prefix;
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 2bc1e81045b0..bfae4a433091 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4114,6 +4114,7 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void 
*insn, int insn_len)
        ctxt->_eip = ctxt->eip;
        ctxt->fetch.start = ctxt->_eip;
        ctxt->fetch.end = ctxt->fetch.start + insn_len;
+       ctxt->opcode_len = 1;
        if (insn_len > 0)
                memcpy(ctxt->fetch.data, insn, insn_len);
 
@@ -4196,7 +4197,7 @@ done_prefixes:
        opcode = opcode_table[ctxt->b];
        /* Two-byte opcode? */
        if (ctxt->b == 0x0f) {
-               ctxt->twobyte = 1;
+               ctxt->opcode_len = 2;
                ctxt->b = insn_fetch(u8, ctxt);
                opcode = twobyte_table[ctxt->b];
        }
@@ -4528,7 +4529,7 @@ special_insn:
                goto writeback;
        }
 
-       if (ctxt->twobyte)
+       if (ctxt->opcode_len == 2)
                goto twobyte_insn;
 
        switch (ctxt->b) {
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8dfde7a52dab..6f2ea40b80cf 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4778,8 +4778,8 @@ static void inject_emulated_exception(struct kvm_vcpu 
*vcpu)
 
 static void init_decode_cache(struct x86_emulate_ctxt *ctxt)
 {
-       memset(&ctxt->twobyte, 0,
-              (void *)&ctxt->_regs - (void *)&ctxt->twobyte);
+       memset(&ctxt->opcode_len, 0,
+              (void *)&ctxt->_regs - (void *)&ctxt->opcode_len);
 
        ctxt->fetch.start = 0;
        ctxt->fetch.end = 0;
-- 
1.8.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/