KVM: SVM: Move Nested SVM Implementation to nested.c

Split out the code for the nested SVM implementation and move it to a
separate file.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Message-Id: <20200324094154.32352-3-joro@8bytes.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/Makefile

@@ -14,7 +14,7 @@ kvm-y			+= x86.o emulate.o i8259.o irq.o lapic.o \
 			   hyperv.o debugfs.o mmu/mmu.o mmu/page_track.o
 
 kvm-intel-y		+= vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o vmx/evmcs.o vmx/nested.o
-kvm-amd-y		+= svm/svm.o svm/pmu.o
+kvm-amd-y		+= svm/svm.o svm/pmu.o svm/nested.o
 
 obj-$(CONFIG_KVM)	+= kvm.o
 obj-$(CONFIG_KVM_INTEL)	+= kvm-intel.o

arch/x86/kvm/svm/svm.h

+// 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>
+ */
+
+#ifndef __SVM_SVM_H
+#define __SVM_SVM_H
+
+#include <linux/kvm_types.h>
+#include <linux/kvm_host.h>
+
+#include <asm/svm.h>
+
+static const u32 host_save_user_msrs[] = {
+#ifdef CONFIG_X86_64
+	MSR_STAR, MSR_LSTAR, MSR_CSTAR, MSR_SYSCALL_MASK, MSR_KERNEL_GS_BASE,
+	MSR_FS_BASE,
+#endif
+	MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
+	MSR_TSC_AUX,
+};
+
+#define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)
+
+#define MSRPM_OFFSETS	16
+extern u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
+extern bool npt_enabled;
+
+enum {
+	VMCB_INTERCEPTS, /* Intercept vectors, TSC offset,
+			    pause filter count */
+	VMCB_PERM_MAP,   /* IOPM Base and MSRPM Base */
+	VMCB_ASID,	 /* ASID */
+	VMCB_INTR,	 /* int_ctl, int_vector */
+	VMCB_NPT,        /* npt_en, nCR3, gPAT */
+	VMCB_CR,	 /* CR0, CR3, CR4, EFER */
+	VMCB_DR,         /* DR6, DR7 */
+	VMCB_DT,         /* GDT, IDT */
+	VMCB_SEG,        /* CS, DS, SS, ES, CPL */
+	VMCB_CR2,        /* CR2 only */
+	VMCB_LBR,        /* DBGCTL, BR_FROM, BR_TO, LAST_EX_FROM, LAST_EX_TO */
+	VMCB_AVIC,       /* AVIC APIC_BAR, AVIC APIC_BACKING_PAGE,
+			  * AVIC PHYSICAL_TABLE pointer,
+			  * AVIC LOGICAL_TABLE pointer
+			  */
+	VMCB_DIRTY_MAX,
+};
+
+/* TPR and CR2 are always written before VMRUN */
+#define VMCB_ALWAYS_DIRTY_MASK	((1U << VMCB_INTR) | (1U << VMCB_CR2))
+
+struct kvm_sev_info {
+	bool active;		/* SEV enabled guest */
+	unsigned int asid;	/* ASID used for this guest */
+	unsigned int handle;	/* SEV firmware handle */
+	int fd;			/* SEV device fd */
+	unsigned long pages_locked; /* Number of pages locked */
+	struct list_head regions_list;  /* List of registered regions */
+};
+
+struct kvm_svm {
+	struct kvm kvm;
+
+	/* Struct members for AVIC */
+	u32 avic_vm_id;
+	struct page *avic_logical_id_table_page;
+	struct page *avic_physical_id_table_page;
+	struct hlist_node hnode;
+
+	struct kvm_sev_info sev_info;
+};
+
+struct kvm_vcpu;
+
+struct nested_state {
+	struct vmcb *hsave;
+	u64 hsave_msr;
+	u64 vm_cr_msr;
+	u64 vmcb;
+
+	/* These are the merged vectors */
+	u32 *msrpm;
+
+	/* gpa pointers to the real vectors */
+	u64 vmcb_msrpm;
+	u64 vmcb_iopm;
+
+	/* A VMEXIT is required but not yet emulated */
+	bool exit_required;
+
+	/* cache for intercepts of the guest */
+	u32 intercept_cr;
+	u32 intercept_dr;
+	u32 intercept_exceptions;
+	u64 intercept;
+
+	/* Nested Paging related state */
+	u64 nested_cr3;
+};
+
+struct vcpu_svm {
+	struct kvm_vcpu vcpu;
+	struct vmcb *vmcb;
+	unsigned long vmcb_pa;
+	struct svm_cpu_data *svm_data;
+	uint64_t asid_generation;
+	uint64_t sysenter_esp;
+	uint64_t sysenter_eip;
+	uint64_t tsc_aux;
+
+	u64 msr_decfg;
+
+	u64 next_rip;
+
+	u64 host_user_msrs[NR_HOST_SAVE_USER_MSRS];
+	struct {
+		u16 fs;
+		u16 gs;
+		u16 ldt;
+		u64 gs_base;
+	} host;
+
+	u64 spec_ctrl;
+	/*
+	 * Contains guest-controlled bits of VIRT_SPEC_CTRL, which will be
+	 * translated into the appropriate L2_CFG bits on the host to
+	 * perform speculative control.
+	 */
+	u64 virt_spec_ctrl;
+
+	u32 *msrpm;
+
+	ulong nmi_iret_rip;
+
+	struct nested_state nested;
+
+	bool nmi_singlestep;
+	u64 nmi_singlestep_guest_rflags;
+
+	unsigned int3_injected;
+	unsigned long int3_rip;
+
+	/* cached guest cpuid flags for faster access */
+	bool nrips_enabled	: 1;
+
+	u32 ldr_reg;
+	u32 dfr_reg;
+	struct page *avic_backing_page;
+	u64 *avic_physical_id_cache;
+	bool avic_is_running;
+
+	/*
+	 * Per-vcpu list of struct amd_svm_iommu_ir:
+	 * This is used mainly to store interrupt remapping information used
+	 * when update the vcpu affinity. This avoids the need to scan for
+	 * IRTE and try to match ga_tag in the IOMMU driver.
+	 */
+	struct list_head ir_list;
+	spinlock_t ir_list_lock;
+
+	/* which host CPU was used for running this vcpu */
+	unsigned int last_cpu;
+};
+
+void recalc_intercepts(struct vcpu_svm *svm);
+
+static inline void mark_all_dirty(struct vmcb *vmcb)
+{
+	vmcb->control.clean = 0;
+}
+
+static inline void mark_all_clean(struct vmcb *vmcb)
+{
+	vmcb->control.clean = ((1 << VMCB_DIRTY_MAX) - 1)
+			       & ~VMCB_ALWAYS_DIRTY_MASK;
+}
+
+static inline void mark_dirty(struct vmcb *vmcb, int bit)
+{
+	vmcb->control.clean &= ~(1 << bit);
+}
+
+static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
+{
+	return container_of(vcpu, struct vcpu_svm, vcpu);
+}
+
+static inline struct vmcb *get_host_vmcb(struct vcpu_svm *svm)
+{
+	if (is_guest_mode(&svm->vcpu))
+		return svm->nested.hsave;
+	else
+		return svm->vmcb;
+}
+
+static inline void set_cr_intercept(struct vcpu_svm *svm, int bit)
+{
+	struct vmcb *vmcb = get_host_vmcb(svm);
+
+	vmcb->control.intercept_cr |= (1U << bit);
+
+	recalc_intercepts(svm);
+}
+
+static inline void clr_cr_intercept(struct vcpu_svm *svm, int bit)
+{
+	struct vmcb *vmcb = get_host_vmcb(svm);
+
+	vmcb->control.intercept_cr &= ~(1U << bit);
+
+	recalc_intercepts(svm);
+}
+
+static inline bool is_cr_intercept(struct vcpu_svm *svm, int bit)
+{
+	struct vmcb *vmcb = get_host_vmcb(svm);
+
+	return vmcb->control.intercept_cr & (1U << bit);
+}
+
+static inline void set_dr_intercepts(struct vcpu_svm *svm)
+{
+	struct vmcb *vmcb = get_host_vmcb(svm);
+
+	vmcb->control.intercept_dr = (1 << INTERCEPT_DR0_READ)
+		| (1 << INTERCEPT_DR1_READ)
+		| (1 << INTERCEPT_DR2_READ)
+		| (1 << INTERCEPT_DR3_READ)
+		| (1 << INTERCEPT_DR4_READ)
+		| (1 << INTERCEPT_DR5_READ)
+		| (1 << INTERCEPT_DR6_READ)
+		| (1 << INTERCEPT_DR7_READ)
+		| (1 << INTERCEPT_DR0_WRITE)
+		| (1 << INTERCEPT_DR1_WRITE)
+		| (1 << INTERCEPT_DR2_WRITE)
+		| (1 << INTERCEPT_DR3_WRITE)
+		| (1 << INTERCEPT_DR4_WRITE)
+		| (1 << INTERCEPT_DR5_WRITE)
+		| (1 << INTERCEPT_DR6_WRITE)
+		| (1 << INTERCEPT_DR7_WRITE);
+
+	recalc_intercepts(svm);
+}
+
+static inline void clr_dr_intercepts(struct vcpu_svm *svm)
+{
+	struct vmcb *vmcb = get_host_vmcb(svm);
+
+	vmcb->control.intercept_dr = 0;
+
+	recalc_intercepts(svm);
+}
+
+static inline void set_exception_intercept(struct vcpu_svm *svm, int bit)
+{
+	struct vmcb *vmcb = get_host_vmcb(svm);
+
+	vmcb->control.intercept_exceptions |= (1U << bit);
+
+	recalc_intercepts(svm);
+}
+
+static inline void clr_exception_intercept(struct vcpu_svm *svm, int bit)
+{
+	struct vmcb *vmcb = get_host_vmcb(svm);
+
+	vmcb->control.intercept_exceptions &= ~(1U << bit);
+
+	recalc_intercepts(svm);
+}
+
+static inline void set_intercept(struct vcpu_svm *svm, int bit)
+{
+	struct vmcb *vmcb = get_host_vmcb(svm);
+
+	vmcb->control.intercept |= (1ULL << bit);
+
+	recalc_intercepts(svm);
+}
+
+static inline void clr_intercept(struct vcpu_svm *svm, int bit)
+{
+	struct vmcb *vmcb = get_host_vmcb(svm);
+
+	vmcb->control.intercept &= ~(1ULL << bit);
+
+	recalc_intercepts(svm);
+}
+
+static inline bool is_intercept(struct vcpu_svm *svm, int bit)
+{
+	return (svm->vmcb->control.intercept & (1ULL << bit)) != 0;
+}
+
+static inline bool vgif_enabled(struct vcpu_svm *svm)
+{
+	return !!(svm->vmcb->control.int_ctl & V_GIF_ENABLE_MASK);
+}
+
+static inline void enable_gif(struct vcpu_svm *svm)
+{
+	if (vgif_enabled(svm))
+		svm->vmcb->control.int_ctl |= V_GIF_MASK;
+	else
+		svm->vcpu.arch.hflags |= HF_GIF_MASK;
+}
+
+static inline void disable_gif(struct vcpu_svm *svm)
+{
+	if (vgif_enabled(svm))
+		svm->vmcb->control.int_ctl &= ~V_GIF_MASK;
+	else
+		svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
+}
+
+static inline bool gif_set(struct vcpu_svm *svm)
+{
+	if (vgif_enabled(svm))
+		return !!(svm->vmcb->control.int_ctl & V_GIF_MASK);
+	else
+		return !!(svm->vcpu.arch.hflags & HF_GIF_MASK);
+}
+
+/* svm.c */
+#define MSR_INVALID			0xffffffffU
+
+u32 svm_msrpm_offset(u32 msr);
+void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer);
+void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
+int svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
+void svm_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa);
+void disable_nmi_singlestep(struct vcpu_svm *svm);
+
+/* nested.c */
+
+#define NESTED_EXIT_HOST	0	/* Exit handled on host level */
+#define NESTED_EXIT_DONE	1	/* Exit caused nested vmexit  */
+#define NESTED_EXIT_CONTINUE	2	/* Further checks needed      */
+
+/* This function returns true if it is save to enable the nmi window */
+static inline bool nested_svm_nmi(struct vcpu_svm *svm)
+{
+	if (!is_guest_mode(&svm->vcpu))
+		return true;
+
+	if (!(svm->nested.intercept & (1ULL << INTERCEPT_NMI)))
+		return true;
+
+	svm->vmcb->control.exit_code = SVM_EXIT_NMI;
+	svm->nested.exit_required = true;
+
+	return false;
+}
+
+static inline bool svm_nested_virtualize_tpr(struct kvm_vcpu *vcpu)
+{
+	return is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK);
+}
+
+void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
+			  struct vmcb *nested_vmcb, struct kvm_host_map *map);
+int nested_svm_vmrun(struct vcpu_svm *svm);
+void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb);
+int nested_svm_vmexit(struct vcpu_svm *svm);
+int nested_svm_exit_handled(struct vcpu_svm *svm);
+int nested_svm_check_permissions(struct vcpu_svm *svm);
+int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
+			       bool has_error_code, u32 error_code);
+int svm_check_nested_events(struct kvm_vcpu *vcpu);
+int nested_svm_exit_special(struct vcpu_svm *svm);
+
+#endif