freebsd-skq/sys/amd64/vmm/amd/svm_genassym.c
Neel Natu 90e528f838 Restore the host's GS.base before returning from 'svm_launch()'.
Previously this was done by the caller of 'svm_launch()' after it returned.
This works fine as long as no code is executed in the interim that depends
on pcpu data.

The dtrace probe 'fbt:vmm:svm_launch:return' broke this assumption because
it calls 'dtrace_probe()' which in turn relies on pcpu data.

Reported by:	avg
MFC after:	1 week
2015-06-23 02:17:23 +00:00

51 lines
2.3 KiB
C

/*-
* 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/assym.h>
#include <x86/specialreg.h>
#include "svm.h"
ASSYM(SCTX_RBX, offsetof(struct svm_regctx, sctx_rbx));
ASSYM(SCTX_RCX, offsetof(struct svm_regctx, sctx_rcx));
ASSYM(SCTX_RBP, offsetof(struct svm_regctx, sctx_rbp));
ASSYM(SCTX_RDX, offsetof(struct svm_regctx, sctx_rdx));
ASSYM(SCTX_RDI, offsetof(struct svm_regctx, sctx_rdi));
ASSYM(SCTX_RSI, offsetof(struct svm_regctx, sctx_rsi));
ASSYM(SCTX_R8, offsetof(struct svm_regctx, sctx_r8));
ASSYM(SCTX_R9, offsetof(struct svm_regctx, sctx_r9));
ASSYM(SCTX_R10, offsetof(struct svm_regctx, sctx_r10));
ASSYM(SCTX_R11, offsetof(struct svm_regctx, sctx_r11));
ASSYM(SCTX_R12, offsetof(struct svm_regctx, sctx_r12));
ASSYM(SCTX_R13, offsetof(struct svm_regctx, sctx_r13));
ASSYM(SCTX_R14, offsetof(struct svm_regctx, sctx_r14));
ASSYM(SCTX_R15, offsetof(struct svm_regctx, sctx_r15));
ASSYM(MSR_GSBASE, MSR_GSBASE);