freebsd-dev/sys/amd64/vmm/amd/svm.h
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

57 lines
1.9 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.
*
* $FreeBSD$
*/
#ifndef _SVM_H_
#define _SVM_H_
struct pcpu;
/*
* Guest register state that is saved outside the VMCB.
*/
struct svm_regctx {
register_t sctx_rbp;
register_t sctx_rbx;
register_t sctx_rcx;
register_t sctx_rdx;
register_t sctx_rdi;
register_t sctx_rsi;
register_t sctx_r8;
register_t sctx_r9;
register_t sctx_r10;
register_t sctx_r11;
register_t sctx_r12;
register_t sctx_r13;
register_t sctx_r14;
register_t sctx_r15;
};
void svm_launch(uint64_t pa, struct svm_regctx *gctx, struct pcpu *pcpu);
#endif /* _SVM_H_ */