2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2014, Neel Natu (neel@freebsd.org)
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/errno.h>
34 #include <sys/systm.h>
36 #include <machine/cpufunc.h>
37 #include <machine/specialreg.h>
38 #include <machine/vmm.h>
42 #include "svm_softc.h"
46 #define MSR_AMDK8_IPM 0xc0010055
54 HOST_MSR_NUM /* must be the last enumeration */
57 static uint64_t host_msrs[HOST_MSR_NUM];
63 * It is safe to cache the values of the following MSRs because they
64 * don't change based on curcpu, curproc or curthread.
66 host_msrs[IDX_MSR_LSTAR] = rdmsr(MSR_LSTAR);
67 host_msrs[IDX_MSR_CSTAR] = rdmsr(MSR_CSTAR);
68 host_msrs[IDX_MSR_STAR] = rdmsr(MSR_STAR);
69 host_msrs[IDX_MSR_SF_MASK] = rdmsr(MSR_SF_MASK);
73 svm_msr_guest_init(struct svm_softc *sc, int vcpu)
76 * All the MSRs accessible to the guest are either saved/restored by
77 * hardware on every #VMEXIT/VMRUN (e.g., G_PAT) or are saved/restored
78 * by VMSAVE/VMLOAD (e.g., MSR_GSBASE).
80 * There are no guest MSRs that are saved/restored "by hand" so nothing
87 svm_msr_guest_enter(struct svm_softc *sc, int vcpu)
90 * Save host MSRs (if any) and restore guest MSRs (if any).
95 svm_msr_guest_exit(struct svm_softc *sc, int vcpu)
98 * Save guest MSRs (if any) and restore host MSRs.
100 wrmsr(MSR_LSTAR, host_msrs[IDX_MSR_LSTAR]);
101 wrmsr(MSR_CSTAR, host_msrs[IDX_MSR_CSTAR]);
102 wrmsr(MSR_STAR, host_msrs[IDX_MSR_STAR]);
103 wrmsr(MSR_SF_MASK, host_msrs[IDX_MSR_SF_MASK]);
105 /* MSR_KGSBASE will be restored on the way back to userspace */
109 svm_rdmsr(struct svm_softc *sc, int vcpu, u_int num, uint64_t *result,
120 case MSR_MTRRdefType:
121 case MSR_MTRR4kBase ... MSR_MTRR4kBase + 8:
122 case MSR_MTRR16kBase ... MSR_MTRR16kBase + 1:
123 case MSR_MTRR64kBase:
126 case MSR_EXTFEATURES:
138 svm_wrmsr(struct svm_softc *sc, int vcpu, u_int num, uint64_t val, bool *retu)
145 break; /* ignore writes */
147 vm_inject_gp(sc->vm, vcpu);
149 case MSR_MTRRdefType:
150 case MSR_MTRR4kBase ... MSR_MTRR4kBase + 8:
151 case MSR_MTRR16kBase ... MSR_MTRR16kBase + 1:
152 case MSR_MTRR64kBase:
154 break; /* Ignore writes */
157 * Ignore writes to the "Interrupt Pending Message" MSR.
160 case MSR_K8_UCODE_UPDATE:
162 * Ignore writes to microcode update register.
165 case MSR_EXTFEATURES: