// SPDX-License-Identifier: GPL-2.0-only
/*
* Kernel-based Virtual Machine driver for Linux
*
* AMD SVM support
*
* Copyright (C) 2006 Qumranet, Inc.
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* Authors:
* Yaniv Kamay <yaniv@qumranet.com>
* Avi Kivity <avi@qumranet.com>
*/
#define pr_fmt(fmt) "SVM: " fmt
#include <linux/kvm_types.h>
#include <linux/kvm_host.h>
#include <linux/kernel.h>
#include <asm/msr-index.h>
#include <asm/debugreg.h>
#include "kvm_emulate.h"
#include "trace.h"
#include "mmu.h"
#include "x86.h"
#include "lapic.h"
#include "svm.h"
static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
struct x86_exception *fault)
{
struct vcpu_svm *svm = to_svm(vcpu);
if (svm->vmcb->control.exit_code != SVM_EXIT_NPF) {
/*
* TODO: track the cause of the nested page fault, and
* correctly fill in the high bits of exit_info_1.
*/
svm->vmcb->control.exit_code = SVM_EXIT_NPF;
svm->vmcb->control.exit_code_hi = 0;
svm->vmcb->control.exit_info_1 = (1ULL << 32);
svm->vmcb->control.exit_info_2 = fault->address;
}
svm->vmcb->control.exit_info_1 &= ~0xffffffffULL;
svm->vmcb->control.exit_info_1 |= fault->error_code;
/*
* The present bit is always zero for page structure faults on real
* hardware.
*/
if (svm->vmcb->control.exit_info_1 & (2ULL << 32))
svm->vmcb->control.exit_info_1 &= ~1;
nested_svm_vmexit(svm);
}
static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
{
struct vcpu_svm *svm = to_svm(vcpu);
u64 cr3 = svm->nested.nested_cr3;
u64 pdpte;
int ret;
ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(__sme_clr(cr3)), &pdpte,
offset_in_page(cr3) + index * 8, 8);
if (ret)
return 0;
return pdpte;
}
static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
return svm->nested.nested_cr3;
}
static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
{
WARN_ON(mmu_is_nested(vcpu));
vcpu->arch.mmu = &vcpu->arch.guest_mmu;
kvm_init_shadow_mmu(vcpu);
vcpu->arch.mmu->get_guest_pgd = nested_svm_get_tdp_cr3;
vcpu->arch.mmu->get_pdptr = nested_svm_get_tdp_pdptr;
vcpu->arch.mmu->inject_page_fault = nested_svm_inject_npf_exit;
vcpu->arch.mmu->shadow_root_level = vcpu->arch.tdp_level;
reset_shadow_zero_bits_mask(vcpu, vcpu->arch.mmu);
vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu;
}
static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
{
vcpu->arch.mmu = &vcpu->arch.root_mmu;
vcpu->arch.walk_mmu = &vcpu->arch.root_mmu;
}
void recalc_intercepts(struct vcpu_svm *svm)
{
struct vmcb_control_area *c, *h;
struct nested_state *g;
mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
if (!is_guest_mode(&svm->vcpu))
return;
c = &svm->vmcb->control;
h = &svm->nested.hsave->control;
g = &svm->nested;
svm->nested.host_intercept_exceptions = h->intercept_exceptions;
c->intercept_cr = h->intercept_cr;
c->intercept_dr = h->intercept_dr;
c->intercept_exceptions = h->intercept_exceptions;
c->intercept = h->intercept;
if (svm->vcpu.arch.hflags & HF_VINTR_MASK) {
/* We only want the cr8 intercept bits of L1 */
c->intercept_cr &= ~(1U << INTERCEPT_CR8_READ);
c->intercept_cr &= ~(1U << INTERCEPT_CR8_WRITE);
/*
* Once running L2 with HF_VINTR_MASK, EFLAGS.IF does not
* affect any interrupt we may want to inject; therefore,
* interrupt window vmexits are irrelevant to L0.
*/
c->intercept &= ~(1ULL << INTERCEPT_VINTR);
}
/* We don't want to see VMMCALLs from a nested guest */
c->intercept &= ~(1ULL << INTERCEPT_VMMCALL);
c->intercept_cr |= g->intercept_cr;
c->intercept_dr |= g->intercept_dr;
c->intercept_exceptions |= g->intercept_exceptions;
c->intercept |= g->intercept;
}
static void copy_vmcb_control_area(struct vmcb_control_area *dst,
struct vmcb_control_area *from)
{
dst->intercept_cr = from->intercept_cr;
dst->intercept_dr = from->intercept_dr;
dst->intercept_exceptions = from->intercept_exceptions;
dst->intercept = from->intercept;
dst->iopm_base_pa = from->iopm_base_pa;
dst->msrpm_base_pa = from->msrpm_base_pa