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abb023fb95
XSAVE-enabled features like AVX. - Store a per-cpu guest xcr0 register. When switching to the guest FPU state, switch to the guest xcr0 value. Note that the guest FPU state is saved and restored using the host's xcr0 value and xcr0 is saved/restored "inside" of saving/restoring the guest FPU state. - Handle VM exits for the xsetbv instruction by updating the guest xcr0. - Expose the XSAVE feature to the guest only if the host has enabled XSAVE, and only advertise XSAVE features enabled by the host to the guest. This ensures that the guest will only adjust FPU state that is a subset of the guest FPU state saved and restored by the host. Reviewed by: grehan
84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/*-
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* Copyright (c) 2012 NetApp, Inc.
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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, this list of conditions and the following 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 NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _VMM_HOST_H_
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#define _VMM_HOST_H_
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#ifndef _KERNEL
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#error "no user-servicable parts inside"
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#endif
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struct xsave_limits {
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int xsave_enabled;
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uint64_t xcr0_allowed;
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uint32_t xsave_max_size;
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};
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void vmm_host_state_init(void);
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uint64_t vmm_get_host_pat(void);
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uint64_t vmm_get_host_efer(void);
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uint64_t vmm_get_host_cr0(void);
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uint64_t vmm_get_host_cr4(void);
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uint64_t vmm_get_host_xcr0(void);
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uint64_t vmm_get_host_datasel(void);
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uint64_t vmm_get_host_codesel(void);
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uint64_t vmm_get_host_tsssel(void);
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uint64_t vmm_get_host_fsbase(void);
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uint64_t vmm_get_host_idtrbase(void);
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const struct xsave_limits *vmm_get_xsave_limits(void);
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/*
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* Inline access to host state that is used on every VM entry
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*/
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static __inline uint64_t
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vmm_get_host_trbase(void)
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{
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return ((uint64_t)PCPU_GET(tssp));
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}
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static __inline uint64_t
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vmm_get_host_gdtrbase(void)
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{
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return ((uint64_t)&gdt[NGDT * curcpu]);
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}
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struct pcpu;
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extern struct pcpu __pcpu[];
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static __inline uint64_t
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vmm_get_host_gsbase(void)
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{
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return ((uint64_t)&__pcpu[curcpu]);
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}
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#endif
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