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Re: [Xen-devel] [PATCH v3 2/3] x86/svm: Drop enum instruction_index and simplify svm_get_insn_len()


  • To: Xen-devel <xen-devel@xxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Mon, 31 Dec 2018 11:57:17 +0000
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  • Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Brian Woods <brian.woods@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Mon, 31 Dec 2018 11:57:41 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 31/12/2018 11:37, Andrew Cooper wrote:
+/*
+ * Encoding for svm_get_insn_len().  We take X86EMUL_OPC() for the main
+ * opcode, shifted left to make room for the ModRM byte.
+ */
+#define INSTR_ENC(opc, modrm) (((unsigned int)(opc) << 8) | (modrm))
+#define MODRM(mod, reg, rm) (((mod) << 6) | ((reg) << 3) | rm)
+
+#define INSTR_PAUSE       INSTR_ENC(X86EMUL_OPC_F3(0, 0x90), 0)
+#define INSTR_INT3        INSTR_ENC(X86EMUL_OPC(   0, 0xcc), 0)
+#define INSTR_ICEBP       INSTR_ENC(X86EMUL_OPC(   0, 0xf1), 0)
+#define INSTR_HLT         INSTR_ENC(X86EMUL_OPC(   0, 0xf4), 0)
+#define INSTR_XSETBV      INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), MODRM(3, 2, 1))
+#define INSTR_VMRUN       INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), MODRM(3, 3, 0))
+#define INSTR_VMCALL      INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), MODRM(3, 3, 1))
+#define INSTR_VMLOAD      INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), MODRM(3, 3, 2))
+#define INSTR_VMSAVE      INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), MODRM(3, 3, 3))
+#define INSTR_STGI        INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), MODRM(3, 3, 4))
+#define INSTR_CLGI        INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), MODRM(3, 3, 5))
+#define INSTR_INVLPGA     INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), MODRM(3, 3, 7))
+#define INSTR_RDTSCP      INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), MODRM(3, 7, 1))

I'm still tempted to drop the MODRM() macro, and use octal notation

#define INSTR_XSETBV      INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), 0321)
#define INSTR_VMRUN       INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), 0330)
#define INSTR_VMCALL      INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), 0331)
#define INSTR_VMLOAD      INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), 0332)
#define INSTR_VMSAVE      INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), 0333)
#define INSTR_STGI        INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), 0334)
#define INSTR_CLGI        INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), 0335)
#define INSTR_INVLPGA     INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), 0337)
#define INSTR_RDTSCP      INSTR_ENC(X86EMUL_OPC(0x0f, 0x01), 0371)

Seeing as this is a far more logical way to read x86 instructions.

~Andrew
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