30571674ce
- Host registers are now stored on the stack instead of a per-cpu host context.
- Host %FS and %GS selectors are not saved and restored across VMRUN.
- Restoring the %FS/%GS selectors was futile anyways since that only updates
the low 32 bits of base address in the hidden descriptor state.
- GS.base is properly updated via the MSR_GSBASE on return from svm_launch().
- FS.base is not used while inside the kernel so it can be safely ignored.
- Add function prologue/epilogue so svm_launch() can be traced with Dtrace's
FBT entry/exit probes. They also serve to save/restore the host %rbp across
VMRUN.
Reviewed by: grehan
Discussed with: Anish Gupta (akgupt3@gmail.com)
49 lines
2.2 KiB
C
49 lines
2.2 KiB
C
/*-
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* Copyright (c) 2013 Anish Gupta (akgupt3@gmail.com)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/assym.h>
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#include "svm.h"
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ASSYM(SCTX_RBX, offsetof(struct svm_regctx, sctx_rbx));
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ASSYM(SCTX_RCX, offsetof(struct svm_regctx, sctx_rcx));
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ASSYM(SCTX_RBP, offsetof(struct svm_regctx, sctx_rbp));
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ASSYM(SCTX_RDX, offsetof(struct svm_regctx, sctx_rdx));
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ASSYM(SCTX_RDI, offsetof(struct svm_regctx, sctx_rdi));
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ASSYM(SCTX_RSI, offsetof(struct svm_regctx, sctx_rsi));
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ASSYM(SCTX_R8, offsetof(struct svm_regctx, sctx_r8));
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ASSYM(SCTX_R9, offsetof(struct svm_regctx, sctx_r9));
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ASSYM(SCTX_R10, offsetof(struct svm_regctx, sctx_r10));
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ASSYM(SCTX_R11, offsetof(struct svm_regctx, sctx_r11));
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ASSYM(SCTX_R12, offsetof(struct svm_regctx, sctx_r12));
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ASSYM(SCTX_R13, offsetof(struct svm_regctx, sctx_r13));
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ASSYM(SCTX_R14, offsetof(struct svm_regctx, sctx_r14));
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ASSYM(SCTX_R15, offsetof(struct svm_regctx, sctx_r15));
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