diff options
Diffstat (limited to 'sys/amd64/vmm/intel/vmx_msr.c')
| -rw-r--r-- | sys/amd64/vmm/intel/vmx_msr.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/sys/amd64/vmm/intel/vmx_msr.c b/sys/amd64/vmm/intel/vmx_msr.c new file mode 100644 index 0000000..2aba63c --- /dev/null +++ b/sys/amd64/vmm/intel/vmx_msr.c @@ -0,0 +1,172 @@ +/*- + * Copyright (c) 2011 NetApp, Inc. + * 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, 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 NETAPP, INC ``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 NETAPP, INC OR CONTRIBUTORS 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. + * + * $FreeBSD$ + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> + +#include <machine/cpufunc.h> + +#include "vmx_msr.h" + +static boolean_t +vmx_ctl_allows_one_setting(uint64_t msr_val, int bitpos) +{ + + if (msr_val & (1UL << (bitpos + 32))) + return (TRUE); + else + return (FALSE); +} + +static boolean_t +vmx_ctl_allows_zero_setting(uint64_t msr_val, int bitpos) +{ + + if ((msr_val & (1UL << bitpos)) == 0) + return (TRUE); + else + return (FALSE); +} + +uint32_t +vmx_revision(void) +{ + + return (rdmsr(MSR_VMX_BASIC) & 0xffffffff); +} + +/* + * Generate a bitmask to be used for the VMCS execution control fields. + * + * The caller specifies what bits should be set to one in 'ones_mask' + * and what bits should be set to zero in 'zeros_mask'. The don't-care + * bits are set to the default value. The default values are obtained + * based on "Algorithm 3" in Section 27.5.1 "Algorithms for Determining + * VMX Capabilities". + * + * Returns zero on success and non-zero on error. + */ +int +vmx_set_ctlreg(int ctl_reg, int true_ctl_reg, uint32_t ones_mask, + uint32_t zeros_mask, uint32_t *retval) +{ + int i; + uint64_t val, trueval; + boolean_t true_ctls_avail, one_allowed, zero_allowed; + + /* We cannot ask the same bit to be set to both '1' and '0' */ + if ((ones_mask ^ zeros_mask) != (ones_mask | zeros_mask)) + return (EINVAL); + + if (rdmsr(MSR_VMX_BASIC) & (1UL << 55)) + true_ctls_avail = TRUE; + else + true_ctls_avail = FALSE; + + val = rdmsr(ctl_reg); + if (true_ctls_avail) + trueval = rdmsr(true_ctl_reg); /* step c */ + else + trueval = val; /* step a */ + + for (i = 0; i < 32; i++) { + one_allowed = vmx_ctl_allows_one_setting(trueval, i); + zero_allowed = vmx_ctl_allows_zero_setting(trueval, i); + + KASSERT(one_allowed || zero_allowed, + ("invalid zero/one setting for bit %d of ctl 0x%0x, " + "truectl 0x%0x\n", i, ctl_reg, true_ctl_reg)); + + if (zero_allowed && !one_allowed) { /* b(i),c(i) */ + if (ones_mask & (1 << i)) + return (EINVAL); + *retval &= ~(1 << i); + } else if (one_allowed && !zero_allowed) { /* b(i),c(i) */ + if (zeros_mask & (1 << i)) + return (EINVAL); + *retval |= 1 << i; + } else { + if (zeros_mask & (1 << i)) /* b(ii),c(ii) */ + *retval &= ~(1 << i); + else if (ones_mask & (1 << i)) /* b(ii), c(ii) */ + *retval |= 1 << i; + else if (!true_ctls_avail) + *retval &= ~(1 << i); /* b(iii) */ + else if (vmx_ctl_allows_zero_setting(val, i))/* c(iii)*/ + *retval &= ~(1 << i); + else if (vmx_ctl_allows_one_setting(val, i)) /* c(iv) */ + *retval |= 1 << i; + else { + panic("vmx_set_ctlreg: unable to determine " + "correct value of ctl bit %d for msr " + "0x%0x and true msr 0x%0x", i, ctl_reg, + true_ctl_reg); + } + } + } + + return (0); +} + +void +msr_bitmap_initialize(char *bitmap) +{ + + memset(bitmap, 0xff, PAGE_SIZE); +} + +int +msr_bitmap_change_access(char *bitmap, u_int msr, int access) +{ + int byte, bit; + + if (msr <= 0x00001FFF) + byte = msr / 8; + else if (msr >= 0xC0000000 && msr <= 0xC0001FFF) + byte = 1024 + (msr - 0xC0000000) / 8; + else + return (EINVAL); + + bit = msr & 0x7; + + if (access & MSR_BITMAP_ACCESS_READ) + bitmap[byte] &= ~(1 << bit); + else + bitmap[byte] |= 1 << bit; + + byte += 2048; + if (access & MSR_BITMAP_ACCESS_WRITE) + bitmap[byte] &= ~(1 << bit); + else + bitmap[byte] |= 1 << bit; + + return (0); +} |
