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/*-
* 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);
}
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