335 lines
12 KiB
C
335 lines
12 KiB
C
/*-
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* Copyright (c) 2013 Anish Gupta (akgupt3@gmail.com)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _VMCB_H_
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#define _VMCB_H_
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struct svm_softc;
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#define BIT(n) (1ULL << n)
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/*
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* Secure Virtual Machine: AMD64 Programmer's Manual Vol2, Chapter 15
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* Layout of VMCB: AMD64 Programmer's Manual Vol2, Appendix B
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*/
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/* vmcb_ctrl->intercept[] array indices */
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#define VMCB_CR_INTCPT 0
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#define VMCB_DR_INTCPT 1
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#define VMCB_EXC_INTCPT 2
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#define VMCB_CTRL1_INTCPT 3
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#define VMCB_CTRL2_INTCPT 4
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/* intercept[VMCB_CTRL1_INTCPT] fields */
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#define VMCB_INTCPT_INTR BIT(0)
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#define VMCB_INTCPT_NMI BIT(1)
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#define VMCB_INTCPT_SMI BIT(2)
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#define VMCB_INTCPT_INIT BIT(3)
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#define VMCB_INTCPT_VINTR BIT(4)
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#define VMCB_INTCPT_CR0_WRITE BIT(5)
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#define VMCB_INTCPT_IDTR_READ BIT(6)
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#define VMCB_INTCPT_GDTR_READ BIT(7)
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#define VMCB_INTCPT_LDTR_READ BIT(8)
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#define VMCB_INTCPT_TR_READ BIT(9)
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#define VMCB_INTCPT_IDTR_WRITE BIT(10)
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#define VMCB_INTCPT_GDTR_WRITE BIT(11)
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#define VMCB_INTCPT_LDTR_WRITE BIT(12)
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#define VMCB_INTCPT_TR_WRITE BIT(13)
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#define VMCB_INTCPT_RDTSC BIT(14)
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#define VMCB_INTCPT_RDPMC BIT(15)
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#define VMCB_INTCPT_PUSHF BIT(16)
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#define VMCB_INTCPT_POPF BIT(17)
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#define VMCB_INTCPT_CPUID BIT(18)
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#define VMCB_INTCPT_RSM BIT(19)
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#define VMCB_INTCPT_IRET BIT(20)
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#define VMCB_INTCPT_INTn BIT(21)
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#define VMCB_INTCPT_INVD BIT(22)
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#define VMCB_INTCPT_PAUSE BIT(23)
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#define VMCB_INTCPT_HLT BIT(24)
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#define VMCB_INTCPT_INVPG BIT(25)
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#define VMCB_INTCPT_INVPGA BIT(26)
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#define VMCB_INTCPT_IO BIT(27)
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#define VMCB_INTCPT_MSR BIT(28)
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#define VMCB_INTCPT_TASK_SWITCH BIT(29)
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#define VMCB_INTCPT_FERR_FREEZE BIT(30)
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#define VMCB_INTCPT_SHUTDOWN BIT(31)
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/* intercept[VMCB_CTRL2_INTCPT] fields */
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#define VMCB_INTCPT_VMRUN BIT(0)
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#define VMCB_INTCPT_VMMCALL BIT(1)
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#define VMCB_INTCPT_VMLOAD BIT(2)
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#define VMCB_INTCPT_VMSAVE BIT(3)
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#define VMCB_INTCPT_STGI BIT(4)
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#define VMCB_INTCPT_CLGI BIT(5)
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#define VMCB_INTCPT_SKINIT BIT(6)
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#define VMCB_INTCPT_RDTSCP BIT(7)
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#define VMCB_INTCPT_ICEBP BIT(8)
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#define VMCB_INTCPT_WBINVD BIT(9)
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#define VMCB_INTCPT_MONITOR BIT(10)
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#define VMCB_INTCPT_MWAIT BIT(11)
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#define VMCB_INTCPT_MWAIT_ARMED BIT(12)
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#define VMCB_INTCPT_XSETBV BIT(13)
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/* VMCB TLB control */
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#define VMCB_TLB_FLUSH_NOTHING 0 /* Flush nothing */
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#define VMCB_TLB_FLUSH_ALL 1 /* Flush entire TLB */
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#define VMCB_TLB_FLUSH_GUEST 3 /* Flush all guest entries */
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#define VMCB_TLB_FLUSH_GUEST_NONGLOBAL 7 /* Flush guest non-PG entries */
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/* VMCB state caching */
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#define VMCB_CACHE_NONE 0 /* No caching */
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#define VMCB_CACHE_I BIT(0) /* Intercept, TSC off, Pause filter */
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#define VMCB_CACHE_IOPM BIT(1) /* I/O and MSR permission */
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#define VMCB_CACHE_ASID BIT(2) /* ASID */
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#define VMCB_CACHE_TPR BIT(3) /* V_TPR to V_INTR_VECTOR */
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#define VMCB_CACHE_NP BIT(4) /* Nested Paging */
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#define VMCB_CACHE_CR BIT(5) /* CR0, CR3, CR4 & EFER */
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#define VMCB_CACHE_DR BIT(6) /* Debug registers */
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#define VMCB_CACHE_DT BIT(7) /* GDT/IDT */
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#define VMCB_CACHE_SEG BIT(8) /* User segments, CPL */
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#define VMCB_CACHE_CR2 BIT(9) /* page fault address */
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#define VMCB_CACHE_LBR BIT(10) /* Last branch */
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/* VMCB control event injection */
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#define VMCB_EVENTINJ_EC_VALID BIT(11) /* Error Code valid */
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#define VMCB_EVENTINJ_VALID BIT(31) /* Event valid */
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/* Event types that can be injected */
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#define VMCB_EVENTINJ_TYPE_INTR 0
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#define VMCB_EVENTINJ_TYPE_NMI 2
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#define VMCB_EVENTINJ_TYPE_EXCEPTION 3
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#define VMCB_EVENTINJ_TYPE_INTn 4
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/* VMCB exit code, APM vol2 Appendix C */
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#define VMCB_EXIT_MC 0x52
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#define VMCB_EXIT_INTR 0x60
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#define VMCB_EXIT_NMI 0x61
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#define VMCB_EXIT_VINTR 0x64
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#define VMCB_EXIT_PUSHF 0x70
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#define VMCB_EXIT_POPF 0x71
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#define VMCB_EXIT_CPUID 0x72
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#define VMCB_EXIT_IRET 0x74
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#define VMCB_EXIT_PAUSE 0x77
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#define VMCB_EXIT_HLT 0x78
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#define VMCB_EXIT_IO 0x7B
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#define VMCB_EXIT_MSR 0x7C
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#define VMCB_EXIT_SHUTDOWN 0x7F
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#define VMCB_EXIT_VMSAVE 0x83
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#define VMCB_EXIT_MONITOR 0x8A
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#define VMCB_EXIT_MWAIT 0x8B
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#define VMCB_EXIT_NPF 0x400
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#define VMCB_EXIT_INVALID -1
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/*
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* Nested page fault.
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* Bit definitions to decode EXITINFO1.
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*/
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#define VMCB_NPF_INFO1_P BIT(0) /* Nested page present. */
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#define VMCB_NPF_INFO1_W BIT(1) /* Access was write. */
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#define VMCB_NPF_INFO1_U BIT(2) /* Access was user access. */
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#define VMCB_NPF_INFO1_RSV BIT(3) /* Reserved bits present. */
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#define VMCB_NPF_INFO1_ID BIT(4) /* Code read. */
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#define VMCB_NPF_INFO1_GPA BIT(32) /* Guest physical address. */
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#define VMCB_NPF_INFO1_GPT BIT(33) /* Guest page table. */
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/*
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* EXITINTINFO, Interrupt exit info for all intrecepts.
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* Section 15.7.2, Intercepts during IDT Interrupt Delivery.
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*/
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#define VMCB_EXITINTINFO_VECTOR(x) ((x) & 0xFF)
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#define VMCB_EXITINTINFO_TYPE(x) (((x) >> 8) & 0x7)
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#define VMCB_EXITINTINFO_EC_VALID(x) (((x) & BIT(11)) ? 1 : 0)
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#define VMCB_EXITINTINFO_VALID(x) (((x) & BIT(31)) ? 1 : 0)
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#define VMCB_EXITINTINFO_EC(x) (((x) >> 32) & 0xFFFFFFFF)
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/* Offset of various VMCB fields. */
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#define VMCB_OFF_CTRL(x) (x)
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#define VMCB_OFF_STATE(x) ((x) + 0x400)
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#define VMCB_OFF_CR_INTERCEPT VMCB_OFF_CTRL(0x0)
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#define VMCB_OFF_DR_INTERCEPT VMCB_OFF_CTRL(0x4)
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#define VMCB_OFF_EXC_INTERCEPT VMCB_OFF_CTRL(0x8)
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#define VMCB_OFF_INST1_INTERCEPT VMCB_OFF_CTRL(0xC)
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#define VMCB_OFF_INST2_INTERCEPT VMCB_OFF_CTRL(0x10)
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#define VMCB_OFF_IO_PERM VMCB_OFF_CTRL(0x40)
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#define VMCB_OFF_MSR_PERM VMCB_OFF_CTRL(0x48)
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#define VMCB_OFF_TSC_OFFSET VMCB_OFF_CTRL(0x50)
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#define VMCB_OFF_ASID VMCB_OFF_CTRL(0x58)
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#define VMCB_OFF_TLB_CTRL VMCB_OFF_CTRL(0x5C)
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#define VMCB_OFF_VIRQ VMCB_OFF_CTRL(0x60)
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#define VMCB_OFF_EXIT_REASON VMCB_OFF_CTRL(0x70)
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#define VMCB_OFF_EXITINFO1 VMCB_OFF_CTRL(0x78)
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#define VMCB_OFF_EXITINFO2 VMCB_OFF_CTRL(0x80)
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#define VMCB_OFF_EXITINTINFO VMCB_OFF_CTRL(0x88)
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#define VMCB_OFF_AVIC_BAR VMCB_OFF_CTRL(0x98)
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#define VMCB_OFF_NPT_BASE VMCB_OFF_CTRL(0xB0)
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#define VMCB_OFF_AVIC_PAGE VMCB_OFF_CTRL(0xE0)
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#define VMCB_OFF_AVIC_LT VMCB_OFF_CTRL(0xF0)
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#define VMCB_OFF_AVIC_PT VMCB_OFF_CTRL(0xF8)
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#define VMCB_OFF_SYSENTER_CS VMCB_OFF_STATE(0x228)
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#define VMCB_OFF_SYSENTER_ESP VMCB_OFF_STATE(0x230)
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#define VMCB_OFF_SYSENTER_EIP VMCB_OFF_STATE(0x238)
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#define VMCB_OFF_GUEST_PAT VMCB_OFF_STATE(0x268)
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/*
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* Encode the VMCB offset and bytes that we want to read from VMCB.
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*/
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#define VMCB_ACCESS(o, w) (0x80000000 | (((w) & 0xF) << 16) | \
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((o) & 0xFFF))
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#define VMCB_ACCESS_OK(v) ((v) & 0x80000000 )
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#define VMCB_ACCESS_BYTES(v) (((v) >> 16) & 0xF)
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#define VMCB_ACCESS_OFFSET(v) ((v) & 0xFFF)
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#ifdef _KERNEL
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/* VMCB save state area segment format */
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struct vmcb_segment {
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uint16_t selector;
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uint16_t attrib;
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uint32_t limit;
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uint64_t base;
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} __attribute__ ((__packed__));
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CTASSERT(sizeof(struct vmcb_segment) == 16);
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/* Code segment descriptor attribute in 12 bit format as saved by VMCB. */
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#define VMCB_CS_ATTRIB_L BIT(9) /* Long mode. */
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#define VMCB_CS_ATTRIB_D BIT(10) /* OPerand size bit. */
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/*
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* The VMCB is divided into two areas - the first one contains various
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* control bits including the intercept vector and the second one contains
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* the guest state.
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*/
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/* VMCB control area - padded up to 1024 bytes */
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struct vmcb_ctrl {
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uint32_t intercept[5]; /* all intercepts */
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uint8_t pad1[0x28]; /* Offsets 0x14-0x3B are reserved. */
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uint16_t pause_filthresh; /* Offset 0x3C, PAUSE filter threshold */
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uint16_t pause_filcnt; /* Offset 0x3E, PAUSE filter count */
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uint64_t iopm_base_pa; /* 0x40: IOPM_BASE_PA */
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uint64_t msrpm_base_pa; /* 0x48: MSRPM_BASE_PA */
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uint64_t tsc_offset; /* 0x50: TSC_OFFSET */
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uint32_t asid; /* 0x58: Guest ASID */
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uint8_t tlb_ctrl; /* 0x5C: TLB_CONTROL */
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uint8_t pad2[3]; /* 0x5D-0x5F: Reserved. */
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uint8_t v_tpr; /* 0x60: V_TPR, guest CR8 */
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uint8_t v_irq:1; /* Is virtual interrupt pending? */
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uint8_t :7; /* Padding */
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uint8_t v_intr_prio:4; /* 0x62: Priority for virtual interrupt. */
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uint8_t v_ign_tpr:1;
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uint8_t :3;
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uint8_t v_intr_masking:1; /* Guest and host sharing of RFLAGS. */
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uint8_t :7;
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uint8_t v_intr_vector; /* 0x65: Vector for virtual interrupt. */
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uint8_t pad3[3]; /* Bit64-40 Reserved. */
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uint64_t intr_shadow:1; /* 0x68: Interrupt shadow, section15.2.1 APM2 */
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uint64_t :63;
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uint64_t exitcode; /* 0x70, Exitcode */
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uint64_t exitinfo1; /* 0x78, EXITINFO1 */
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uint64_t exitinfo2; /* 0x80, EXITINFO2 */
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uint64_t exitintinfo; /* 0x88, Interrupt exit value. */
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uint64_t np_enable:1; /* 0x90, Nested paging enable. */
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uint64_t :63;
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uint8_t pad4[0x10]; /* 0x98-0xA7 reserved. */
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uint64_t eventinj; /* 0xA8, Event injection. */
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uint64_t n_cr3; /* B0, Nested page table. */
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uint64_t lbr_virt_en:1; /* Enable LBR virtualization. */
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uint64_t :63;
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uint32_t vmcb_clean; /* 0xC0: VMCB clean bits for caching */
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uint32_t :32; /* 0xC4: Reserved */
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uint64_t nrip; /* 0xC8: Guest next nRIP. */
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uint8_t inst_len; /* 0xD0: #NPF decode assist */
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uint8_t inst_bytes[15];
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uint8_t padd6[0x320];
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} __attribute__ ((__packed__));
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CTASSERT(sizeof(struct vmcb_ctrl) == 1024);
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struct vmcb_state {
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struct vmcb_segment es;
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struct vmcb_segment cs;
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struct vmcb_segment ss;
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struct vmcb_segment ds;
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struct vmcb_segment fs;
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struct vmcb_segment gs;
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struct vmcb_segment gdt;
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struct vmcb_segment ldt;
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struct vmcb_segment idt;
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struct vmcb_segment tr;
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uint8_t pad1[0x2b]; /* Reserved: 0xA0-0xCA */
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uint8_t cpl;
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uint8_t pad2[4];
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uint64_t efer;
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uint8_t pad3[0x70]; /* Reserved: 0xd8-0x147 */
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uint64_t cr4;
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uint64_t cr3; /* Guest CR3 */
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uint64_t cr0;
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uint64_t dr7;
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uint64_t dr6;
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uint64_t rflags;
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uint64_t rip;
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uint8_t pad4[0x58]; /* Reserved: 0x180-0x1D7 */
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uint64_t rsp;
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uint8_t pad5[0x18]; /* Reserved 0x1E0-0x1F7 */
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uint64_t rax;
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uint64_t star;
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uint64_t lstar;
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uint64_t cstar;
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uint64_t sfmask;
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uint64_t kernelgsbase;
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uint64_t sysenter_cs;
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uint64_t sysenter_esp;
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uint64_t sysenter_eip;
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uint64_t cr2;
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uint8_t pad6[0x20];
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uint64_t g_pat;
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uint64_t dbgctl;
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uint64_t br_from;
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uint64_t br_to;
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uint64_t int_from;
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uint64_t int_to;
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uint8_t pad7[0x968]; /* Reserved upto end of VMCB */
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} __attribute__ ((__packed__));
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CTASSERT(sizeof(struct vmcb_state) == 0xC00);
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struct vmcb {
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struct vmcb_ctrl ctrl;
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struct vmcb_state state;
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} __attribute__ ((__packed__));
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CTASSERT(sizeof(struct vmcb) == PAGE_SIZE);
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CTASSERT(offsetof(struct vmcb, state) == 0x400);
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int vmcb_read(struct svm_softc *sc, int vcpu, int ident, uint64_t *retval);
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int vmcb_write(struct svm_softc *sc, int vcpu, int ident, uint64_t val);
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int vmcb_setdesc(void *arg, int vcpu, int ident, struct seg_desc *desc);
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int vmcb_getdesc(void *arg, int vcpu, int ident, struct seg_desc *desc);
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int vmcb_seg(struct vmcb *vmcb, int ident, struct vmcb_segment *seg);
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#endif /* _KERNEL */
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#endif /* _VMCB_H_ */
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