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// SPDX-License-Identifier: GPL-2.0-only
/*
* vMTRR implementation
*
* Copyright (C) 2006 Qumranet, Inc.
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
* Copyright(C) 2015 Intel Corporation.
*
* Authors:
* Yaniv Kamay <yaniv@qumranet.com>
* Avi Kivity <avi@qumranet.com>
* Marcelo Tosatti <mtosatti@redhat.com>
* Paolo Bonzini <pbonzini@redhat.com>
* Xiao Guangrong <guangrong.xiao@linux.intel.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kvm_host.h>
#include <asm/mtrr.h>
#include "cpuid.h"
static u64 *find_mtrr(struct kvm_vcpu *vcpu, unsigned int msr)
{
int index;
switch (msr) {
case MTRRphysBase_MSR(0) ... MTRRphysMask_MSR(KVM_NR_VAR_MTRR - 1):
index = msr - MTRRphysBase_MSR(0);
return &vcpu->arch.mtrr_state.var[index];
case MSR_MTRRfix64K_00000:
return &vcpu->arch.mtrr_state.fixed_64k;
case MSR_MTRRfix16K_80000:
case MSR_MTRRfix16K_A0000:
index = msr - MSR_MTRRfix16K_80000;
return &vcpu->arch.mtrr_state.fixed_16k[index];
case MSR_MTRRfix4K_C0000:
case MSR_MTRRfix4K_C8000:
case MSR_MTRRfix4K_D0000:
case MSR_MTRRfix4K_D8000:
case MSR_MTRRfix4K_E0000:
case MSR_MTRRfix4K_E8000:
case MSR_MTRRfix4K_F0000:
case MSR_MTRRfix4K_F8000:
index = msr - MSR_MTRRfix4K_C0000;
return &vcpu->arch.mtrr_state.fixed_4k[index];
case MSR_MTRRdefType:
return &vcpu->arch.mtrr_state.deftype;
default:
break;
}
return NULL;
}
static bool valid_mtrr_type(unsigned t)
{
return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
}
static bool kvm_mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
int i;
u64 mask;
if (msr == MSR_MTRRdefType) {
if (data & ~0xcff)
return false;
return valid_mtrr_type(data & 0xff);
} else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
for (i = 0; i < 8 ; i++)
if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
return false;
return true;
}
/* variable MTRRs */
if (WARN_ON_ONCE(!(msr >= MTRRphysBase_MSR(0) &&
msr <= MTRRphysMask_MSR(KVM_NR_VAR_MTRR - 1))))
return false;
mask = kvm_vcpu_reserved_gpa_bits_raw(vcpu);
if ((msr & 1) == 0) {
/* MTRR base */
if (!valid_mtrr_type(data & 0xff))
return false;
mask |= 0xf00;
} else {
/* MTRR mask */
mask |= 0x7ff;
}
return (data & mask) == 0;
}
int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
u64 *mtrr;
mtrr = find_mtrr(vcpu, msr);
if (!mtrr)
return 1;
if (!kvm_mtrr_valid(vcpu, msr, data))
return 1;
*mtrr = data;
return 0;
}
int kvm_mtrr_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
u64 *mtrr;
/* MSR_MTRRcap is a readonly MSR. */
if (msr == MSR_MTRRcap) {
/*
* SMRR = 0
* WC = 1
* FIX = 1
* VCNT = KVM_NR_VAR_MTRR
*/
*pdata = 0x500 | KVM_NR_VAR_MTRR;
return 0;
}
mtrr = find_mtrr(vcpu, msr);
if (!mtrr)
return 1;
*pdata = *mtrr;
return 0;
}
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