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/*-
* Copyright (c) 2011 NetApp, Inc.
* 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, 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 NETAPP, INC ``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 NETAPP, INC OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
#include <machine/asmacros.h>
#include "vmx_assym.s"
/*
* Disable interrupts before updating %rsp in VMX_CHECK_AST or
* VMX_GUEST_RESTORE.
*
* The location that %rsp points to is a 'vmxctx' and not a
* real stack so we don't want an interrupt handler to trash it
*/
#define VMX_DISABLE_INTERRUPTS cli
/*
* If the thread hosting the vcpu has an ast pending then take care of it
* by returning from vmx_setjmp() with a return value of VMX_RETURN_AST.
*
* Assumes that %rdi holds a pointer to the 'vmxctx' and that interrupts
* are disabled.
*/
#define VMX_CHECK_AST \
movq PCPU(CURTHREAD),%rax; \
testl $TDF_ASTPENDING | TDF_NEEDRESCHED,TD_FLAGS(%rax); \
je 9f; \
movq $VMX_RETURN_AST,%rsi; \
movq %rdi,%rsp; \
addq $VMXCTX_TMPSTKTOP,%rsp; \
callq vmx_return; \
9:
/*
* Assumes that %rdi holds a pointer to the 'vmxctx'.
*
* On "return" all registers are updated to reflect guest state. The two
* exceptions are %rip and %rsp. These registers are atomically switched
* by hardware from the guest area of the vmcs.
*
* We modify %rsp to point to the 'vmxctx' so we can use it to restore
* host context in case of an error with 'vmlaunch' or 'vmresume'.
*/
#define VMX_GUEST_RESTORE \
movq %rdi,%rsp; \
movq VMXCTX_GUEST_CR2(%rdi),%rsi; \
movq %rsi,%cr2; \
movq VMXCTX_GUEST_RSI(%rdi),%rsi; \
movq VMXCTX_GUEST_RDX(%rdi),%rdx; \
movq VMXCTX_GUEST_RCX(%rdi),%rcx; \
movq VMXCTX_GUEST_R8(%rdi),%r8; \
movq VMXCTX_GUEST_R9(%rdi),%r9; \
movq VMXCTX_GUEST_RAX(%rdi),%rax; \
movq VMXCTX_GUEST_RBX(%rdi),%rbx; \
movq VMXCTX_GUEST_RBP(%rdi),%rbp; \
movq VMXCTX_GUEST_R10(%rdi),%r10; \
movq VMXCTX_GUEST_R11(%rdi),%r11; \
movq VMXCTX_GUEST_R12(%rdi),%r12; \
movq VMXCTX_GUEST_R13(%rdi),%r13; \
movq VMXCTX_GUEST_R14(%rdi),%r14; \
movq VMXCTX_GUEST_R15(%rdi),%r15; \
movq VMXCTX_GUEST_RDI(%rdi),%rdi; /* restore rdi the last */
#define VM_INSTRUCTION_ERROR(reg) \
jnc 1f; \
movl $VM_FAIL_INVALID,reg; /* CF is set */ \
jmp 3f; \
1: jnz 2f; \
movl $VM_FAIL_VALID,reg; /* ZF is set */ \
jmp 3f; \
2: movl $VM_SUCCESS,reg; \
3: movl reg,VMXCTX_LAUNCH_ERROR(%rsp)
.text
/*
* int vmx_setjmp(ctxp)
* %rdi = ctxp
*
* Return value is '0' when it returns directly from here.
* Return value is '1' when it returns after a vm exit through vmx_longjmp.
*/
ENTRY(vmx_setjmp)
movq (%rsp),%rax /* return address */
movq %r15,VMXCTX_HOST_R15(%rdi)
movq %r14,VMXCTX_HOST_R14(%rdi)
movq %r13,VMXCTX_HOST_R13(%rdi)
movq %r12,VMXCTX_HOST_R12(%rdi)
movq %rbp,VMXCTX_HOST_RBP(%rdi)
movq %rsp,VMXCTX_HOST_RSP(%rdi)
movq %rbx,VMXCTX_HOST_RBX(%rdi)
movq %rax,VMXCTX_HOST_RIP(%rdi)
/*
* XXX save host debug registers
*/
movl $VMX_RETURN_DIRECT,%eax
ret
END(vmx_setjmp)
/*
* void vmx_return(struct vmxctx *ctxp, int retval)
* %rdi = ctxp
* %rsi = retval
* Return to vmm context through vmx_setjmp() with a value of 'retval'.
*/
ENTRY(vmx_return)
/* Restore host context. */
movq VMXCTX_HOST_R15(%rdi),%r15
movq VMXCTX_HOST_R14(%rdi),%r14
movq VMXCTX_HOST_R13(%rdi),%r13
movq VMXCTX_HOST_R12(%rdi),%r12
movq VMXCTX_HOST_RBP(%rdi),%rbp
movq VMXCTX_HOST_RSP(%rdi),%rsp
movq VMXCTX_HOST_RBX(%rdi),%rbx
movq VMXCTX_HOST_RIP(%rdi),%rax
movq %rax,(%rsp) /* return address */
/*
* XXX restore host debug registers
*/
movl %esi,%eax
ret
END(vmx_return)
/*
* void vmx_longjmp(void)
* %rsp points to the struct vmxctx
*/
ENTRY(vmx_longjmp)
/*
* Save guest state that is not automatically saved in the vmcs.
*/
movq %rdi,VMXCTX_GUEST_RDI(%rsp)
movq %rsi,VMXCTX_GUEST_RSI(%rsp)
movq %rdx,VMXCTX_GUEST_RDX(%rsp)
movq %rcx,VMXCTX_GUEST_RCX(%rsp)
movq %r8,VMXCTX_GUEST_R8(%rsp)
movq %r9,VMXCTX_GUEST_R9(%rsp)
movq %rax,VMXCTX_GUEST_RAX(%rsp)
movq %rbx,VMXCTX_GUEST_RBX(%rsp)
movq %rbp,VMXCTX_GUEST_RBP(%rsp)
movq %r10,VMXCTX_GUEST_R10(%rsp)
movq %r11,VMXCTX_GUEST_R11(%rsp)
movq %r12,VMXCTX_GUEST_R12(%rsp)
movq %r13,VMXCTX_GUEST_R13(%rsp)
movq %r14,VMXCTX_GUEST_R14(%rsp)
movq %r15,VMXCTX_GUEST_R15(%rsp)
movq %cr2,%rdi
movq %rdi,VMXCTX_GUEST_CR2(%rsp)
movq %rsp,%rdi
movq $VMX_RETURN_LONGJMP,%rsi
addq $VMXCTX_TMPSTKTOP,%rsp
callq vmx_return
END(vmx_longjmp)
/*
* void vmx_resume(struct vmxctx *ctxp)
* %rdi = ctxp
*
* Although the return type is a 'void' this function may return indirectly
* through vmx_setjmp() with a return value of 2.
*/
ENTRY(vmx_resume)
VMX_DISABLE_INTERRUPTS
VMX_CHECK_AST
/*
* Restore guest state that is not automatically loaded from the vmcs.
*/
VMX_GUEST_RESTORE
vmresume
/*
* Capture the reason why vmresume failed.
*/
VM_INSTRUCTION_ERROR(%eax)
/* Return via vmx_setjmp with return value of VMX_RETURN_VMRESUME */
movq %rsp,%rdi
movq $VMX_RETURN_VMRESUME,%rsi
addq $VMXCTX_TMPSTKTOP,%rsp
callq vmx_return
END(vmx_resume)
/*
* void vmx_launch(struct vmxctx *ctxp)
* %rdi = ctxp
*
* Although the return type is a 'void' this function may return indirectly
* through vmx_setjmp() with a return value of 3.
*/
ENTRY(vmx_launch)
VMX_DISABLE_INTERRUPTS
VMX_CHECK_AST
/*
* Restore guest state that is not automatically loaded from the vmcs.
*/
VMX_GUEST_RESTORE
vmlaunch
/*
* Capture the reason why vmlaunch failed.
*/
VM_INSTRUCTION_ERROR(%eax)
/* Return via vmx_setjmp with return value of VMX_RETURN_VMLAUNCH */
movq %rsp,%rdi
movq $VMX_RETURN_VMLAUNCH,%rsi
addq $VMXCTX_TMPSTKTOP,%rsp
callq vmx_return
END(vmx_launch)
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