freebsd-skq/sys/amd64/vmm/amd/svm_support.S

138 lines
4.0 KiB
ArmAsm
Raw Normal View History

/*-
* Copyright (c) 2013, Anish Gupta (akgupt3@gmail.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/asmacros.h>
#include "svm_assym.s"
/*
* Macros to save and restore GPRs.
*/
#define SAVE_GPR_STATE(reg); \
movq %rbp, SCTX_RBP(reg); \
movq %rbx, SCTX_RBX(reg); \
movq %rcx, SCTX_RCX(reg); \
movq %r8, SCTX_R8(reg); \
movq %r9, SCTX_R9(reg); \
movq %r10, SCTX_R10(reg); \
movq %r11, SCTX_R11(reg); \
movq %r12, SCTX_R12(reg); \
movq %r13, SCTX_R13(reg); \
movq %r14, SCTX_R14(reg); \
movq %r15, SCTX_R15(reg); \
#define LOAD_GPR_STATE(reg) \
movq SCTX_RBP(reg), %rbp; \
movq SCTX_RBX(reg), %rbx; \
movq SCTX_RCX(reg), %rcx; \
movq SCTX_R8(reg), %r8; \
movq SCTX_R9(reg), %r9; \
movq SCTX_R10(reg), %r10; \
movq SCTX_R11(reg), %r11; \
movq SCTX_R12(reg), %r12; \
movq SCTX_R13(reg), %r13; \
movq SCTX_R14(reg), %r14; \
movq SCTX_R15(reg), %r15; \
/*
* Macros to save and restore vcpu registers which are not
* done by SVM.
*/
#define SAVE_GUEST_STATE(reg) \
movq %rdi, SCTX_GUEST_RDI(reg); \
movq %rsi, SCTX_GUEST_RSI(reg); \
movq %rdx, SCTX_GUEST_RDX(reg); \
SAVE_GPR_STATE(reg)
#define LOAD_GUEST_STATE(reg) \
movq SCTX_GUEST_RDI(reg), %rdi; \
movq SCTX_GUEST_RSI(reg), %rsi; \
movq SCTX_GUEST_RDX(reg), %rdx; \
LOAD_GPR_STATE(reg)
/*
* Macros to save and restore host registers which are not
* saved by SVM.
*/
#define SAVE_HOST_STATE(reg) \
mov %fs, SCTX_HOST_FS(reg); \
mov %gs, SCTX_HOST_GS(reg); \
movq %rsp, SCTX_HOST_RSP(reg); \
SAVE_GPR_STATE(reg)
#define LOAD_HOST_STATE(reg) \
mov SCTX_HOST_FS(reg), %fs; \
mov SCTX_HOST_GS(reg), %gs; \
movq SCTX_HOST_RSP(reg), %rsp; \
LOAD_GPR_STATE(reg)
/*
* This is where virtual machine vcpu start execution.
* int svm_launch(vmcb_pa, gswctx, hswctx)
* vmcb_pa - VMCB physical address is in %rdi.
* gswctx - Guest context is in %rsi.
* hswctx - Host context is in %rdx.
*
* Note: SVM guarantees host RSP and RAX will be restored
* back after guest exit. RAX is where VMCB Phy addr is so
* we are left with only RSP. RSP will hold base for guest
* software context which will have base for host software
* context.
*/
ENTRY(svm_launch)
/* Save host GPRs. */
SAVE_HOST_STATE(%rdx)
/*
* Move the parameters to final destinations.
* RAX - VMCB phy addr.
* RSP - Guest software context.
* SCTX_GUEST_HOST(guest) - Host software context.
*/
movq %rdi, %rax
movq %rsi, %rsp
movq %rdx, SCTX_GUEST_HCTX_BASE(%rsp)
/* Load guest context. */
LOAD_GUEST_STATE(%rsp)
vmload %rax
vmrun %rax
vmsave %rax
/* Save guest state. */
SAVE_GUEST_STATE(%rsp)
/* Restore host context base in RDX. */
movq SCTX_GUEST_HCTX_BASE(%rsp), %rdx
/* Restore host GPRs. */
LOAD_HOST_STATE(%rdx)
ret
END(svm_launch)