diff options
Diffstat (limited to 'sys/amd64/vmm/amd/svm_support.S')
| -rw-r--r-- | sys/amd64/vmm/amd/svm_support.S | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/sys/amd64/vmm/amd/svm_support.S b/sys/amd64/vmm/amd/svm_support.S new file mode 100644 index 000000000000..e9493bdce9a6 --- /dev/null +++ b/sys/amd64/vmm/amd/svm_support.S @@ -0,0 +1,132 @@ +/*- + * 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. + * + * $FreeBSD$ + */ +#include <machine/asmacros.h> + +#include "svm_assym.h" + +/* + * Be friendly to DTrace FBT's prologue/epilogue pattern matching. + * + * They are also responsible for saving/restoring the host %rbp across VMRUN. + */ +#define VENTER push %rbp ; mov %rsp,%rbp +#define VLEAVE pop %rbp + +#define VMLOAD .byte 0x0f, 0x01, 0xda +#define VMRUN .byte 0x0f, 0x01, 0xd8 +#define VMSAVE .byte 0x0f, 0x01, 0xdb + +/* + * svm_launch(uint64_t vmcb, struct svm_regctx *gctx, struct pcpu *pcpu) + * %rdi: physical address of VMCB + * %rsi: pointer to guest context + * %rdx: pointer to the pcpu data + */ +ENTRY(svm_launch) + VENTER + + /* save pointer to the pcpu data */ + push %rdx + + /* + * Host register state saved across a VMRUN. + * + * All "callee saved registers" except: + * %rsp: because it is preserved by the processor across VMRUN. + * %rbp: because it is saved/restored by the function prologue/epilogue. + */ + push %rbx + push %r12 + push %r13 + push %r14 + push %r15 + + /* Save the physical address of the VMCB in %rax */ + movq %rdi, %rax + + push %rsi /* push guest context pointer on the stack */ + + /* + * Restore guest state. + */ + movq SCTX_R8(%rsi), %r8 + movq SCTX_R9(%rsi), %r9 + movq SCTX_R10(%rsi), %r10 + movq SCTX_R11(%rsi), %r11 + movq SCTX_R12(%rsi), %r12 + movq SCTX_R13(%rsi), %r13 + movq SCTX_R14(%rsi), %r14 + movq SCTX_R15(%rsi), %r15 + movq SCTX_RBP(%rsi), %rbp + movq SCTX_RBX(%rsi), %rbx + movq SCTX_RCX(%rsi), %rcx + movq SCTX_RDX(%rsi), %rdx + movq SCTX_RDI(%rsi), %rdi + movq SCTX_RSI(%rsi), %rsi /* %rsi must be restored last */ + + VMLOAD + VMRUN + VMSAVE + + pop %rax /* pop guest context pointer from the stack */ + + /* + * Save guest state. + */ + movq %r8, SCTX_R8(%rax) + movq %r9, SCTX_R9(%rax) + movq %r10, SCTX_R10(%rax) + movq %r11, SCTX_R11(%rax) + movq %r12, SCTX_R12(%rax) + movq %r13, SCTX_R13(%rax) + movq %r14, SCTX_R14(%rax) + movq %r15, SCTX_R15(%rax) + movq %rbp, SCTX_RBP(%rax) + movq %rbx, SCTX_RBX(%rax) + movq %rcx, SCTX_RCX(%rax) + movq %rdx, SCTX_RDX(%rax) + movq %rdi, SCTX_RDI(%rax) + movq %rsi, SCTX_RSI(%rax) + + /* Restore host state */ + pop %r15 + pop %r14 + pop %r13 + pop %r12 + pop %rbx + + /* Restore %GS.base to point to the host's pcpu data */ + pop %rdx + mov %edx, %eax + shr $32, %rdx + mov $MSR_GSBASE, %ecx + wrmsr + + VLEAVE + ret +END(svm_launch) |