[RFC PATCH v12 05/33] KVM: Convert KVM_ARCH_WANT_MMU_NOTIFIER to CONFIG_KVM_GENERIC_MMU_NOTIFIER
Sean Christopherson
seanjc at google.com
Wed Sep 13 18:55:03 PDT 2023
Convert KVM_ARCH_WANT_MMU_NOTIFIER into a Kconfig and select it where
appropriate to effectively maintain existing behavior. Using a proper
Kconfig will simplify building more functionality on top of KVM's
mmu_notifier infrastructure.
Add a forward declaration of kvm_gfn_range to kvm_types.h so that
including arch/powerpc/include/asm/kvm_ppc.h's with CONFIG_KVM=n doesn't
generate warnings due to kvm_gfn_range being undeclared. PPC defines
hooks for PR vs. HV without guarding them via #ifdeffery, e.g.
bool (*unmap_gfn_range)(struct kvm *kvm, struct kvm_gfn_range *range);
bool (*age_gfn)(struct kvm *kvm, struct kvm_gfn_range *range);
bool (*test_age_gfn)(struct kvm *kvm, struct kvm_gfn_range *range);
bool (*set_spte_gfn)(struct kvm *kvm, struct kvm_gfn_range *range);
Alternatively, PPC could forward declare kvm_gfn_range, but there's no
good reason not to define it in common KVM.
Signed-off-by: Sean Christopherson <seanjc at google.com>
---
arch/arm64/include/asm/kvm_host.h | 2 --
arch/arm64/kvm/Kconfig | 2 +-
arch/mips/include/asm/kvm_host.h | 2 --
arch/mips/kvm/Kconfig | 2 +-
arch/powerpc/include/asm/kvm_host.h | 2 --
arch/powerpc/kvm/Kconfig | 8 ++++----
arch/powerpc/kvm/powerpc.c | 4 +---
arch/riscv/include/asm/kvm_host.h | 2 --
arch/riscv/kvm/Kconfig | 2 +-
arch/x86/include/asm/kvm_host.h | 2 --
arch/x86/kvm/Kconfig | 2 +-
include/linux/kvm_host.h | 6 +++---
include/linux/kvm_types.h | 1 +
virt/kvm/Kconfig | 4 ++++
virt/kvm/kvm_main.c | 10 +++++-----
15 files changed, 22 insertions(+), 29 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index af06ccb7ee34..9e046b64847a 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -921,8 +921,6 @@ int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
struct kvm_vcpu_events *events);
-#define KVM_ARCH_WANT_MMU_NOTIFIER
-
void kvm_arm_halt_guest(struct kvm *kvm);
void kvm_arm_resume_guest(struct kvm *kvm);
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 83c1e09be42e..1a777715199f 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -22,7 +22,7 @@ menuconfig KVM
bool "Kernel-based Virtual Machine (KVM) support"
depends on HAVE_KVM
select KVM_GENERIC_HARDWARE_ENABLING
- select MMU_NOTIFIER
+ select KVM_GENERIC_MMU_NOTIFIER
select PREEMPT_NOTIFIERS
select HAVE_KVM_CPU_RELAX_INTERCEPT
select KVM_MMIO
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index 54a85f1d4f2c..179f320cc231 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -810,8 +810,6 @@ int kvm_mips_mkclean_gpa_pt(struct kvm *kvm, gfn_t start_gfn, gfn_t end_gfn);
pgd_t *kvm_pgd_alloc(void);
void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
-#define KVM_ARCH_WANT_MMU_NOTIFIER
-
/* Emulation */
enum emulation_result update_pc(struct kvm_vcpu *vcpu, u32 cause);
int kvm_get_badinstr(u32 *opc, struct kvm_vcpu *vcpu, u32 *out);
diff --git a/arch/mips/kvm/Kconfig b/arch/mips/kvm/Kconfig
index a8cdba75f98d..c04987d2ed2e 100644
--- a/arch/mips/kvm/Kconfig
+++ b/arch/mips/kvm/Kconfig
@@ -25,7 +25,7 @@ config KVM
select HAVE_KVM_EVENTFD
select HAVE_KVM_VCPU_ASYNC_IOCTL
select KVM_MMIO
- select MMU_NOTIFIER
+ select KVM_GENERIC_MMU_NOTIFIER
select INTERVAL_TREE
select KVM_GENERIC_HARDWARE_ENABLING
help
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 14ee0dece853..4b5c3f2acf78 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -62,8 +62,6 @@
#include <linux/mmu_notifier.h>
-#define KVM_ARCH_WANT_MMU_NOTIFIER
-
#define HPTEG_CACHE_NUM (1 << 15)
#define HPTEG_HASH_BITS_PTE 13
#define HPTEG_HASH_BITS_PTE_LONG 12
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index 902611954200..b33358ee6424 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -42,7 +42,7 @@ config KVM_BOOK3S_64_HANDLER
config KVM_BOOK3S_PR_POSSIBLE
bool
select KVM_MMIO
- select MMU_NOTIFIER
+ select KVM_GENERIC_MMU_NOTIFIER
config KVM_BOOK3S_HV_POSSIBLE
bool
@@ -85,7 +85,7 @@ config KVM_BOOK3S_64_HV
tristate "KVM for POWER7 and later using hypervisor mode in host"
depends on KVM_BOOK3S_64 && PPC_POWERNV
select KVM_BOOK3S_HV_POSSIBLE
- select MMU_NOTIFIER
+ select KVM_GENERIC_MMU_NOTIFIER
select CMA
help
Support running unmodified book3s_64 guest kernels in
@@ -194,7 +194,7 @@ config KVM_E500V2
depends on !CONTEXT_TRACKING_USER
select KVM
select KVM_MMIO
- select MMU_NOTIFIER
+ select KVM_GENERIC_MMU_NOTIFIER
help
Support running unmodified E500 guest kernels in virtual machines on
E500v2 host processors.
@@ -211,7 +211,7 @@ config KVM_E500MC
select KVM
select KVM_MMIO
select KVM_BOOKE_HV
- select MMU_NOTIFIER
+ select KVM_GENERIC_MMU_NOTIFIER
help
Support running unmodified E500MC/E5500/E6500 guest kernels in
virtual machines on E500MC/E5500/E6500 host processors.
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 8d3ec483bc2b..aac75c98a956 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -632,9 +632,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
break;
#endif
case KVM_CAP_SYNC_MMU:
-#if !defined(CONFIG_MMU_NOTIFIER) || !defined(KVM_ARCH_WANT_MMU_NOTIFIER)
- BUILD_BUG();
-#endif
+ BUILD_BUG_ON(!IS_ENABLED(CONFIG_KVM_GENERIC_MMU_NOTIFIER));
r = 1;
break;
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
index 1ebf20dfbaa6..66ee9ff483e9 100644
--- a/arch/riscv/include/asm/kvm_host.h
+++ b/arch/riscv/include/asm/kvm_host.h
@@ -249,8 +249,6 @@ struct kvm_vcpu_arch {
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
-#define KVM_ARCH_WANT_MMU_NOTIFIER
-
#define KVM_RISCV_GSTAGE_TLB_MIN_ORDER 12
void kvm_riscv_local_hfence_gvma_vmid_gpa(unsigned long vmid,
diff --git a/arch/riscv/kvm/Kconfig b/arch/riscv/kvm/Kconfig
index dfc237d7875b..ae2e05f050ec 100644
--- a/arch/riscv/kvm/Kconfig
+++ b/arch/riscv/kvm/Kconfig
@@ -30,7 +30,7 @@ config KVM
select KVM_GENERIC_HARDWARE_ENABLING
select KVM_MMIO
select KVM_XFER_TO_GUEST_WORK
- select MMU_NOTIFIER
+ select KVM_GENERIC_MMU_NOTIFIER
select PREEMPT_NOTIFIERS
help
Support hosting virtualized guest machines.
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 1a4def36d5bb..3a2b53483524 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2131,8 +2131,6 @@ enum {
# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, 0)
#endif
-#define KVM_ARCH_WANT_MMU_NOTIFIER
-
int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v);
int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
int kvm_cpu_has_extint(struct kvm_vcpu *v);
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index ed90f148140d..091b74599c22 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -24,7 +24,7 @@ config KVM
depends on HIGH_RES_TIMERS
depends on X86_LOCAL_APIC
select PREEMPT_NOTIFIERS
- select MMU_NOTIFIER
+ select KVM_GENERIC_MMU_NOTIFIER
select HAVE_KVM_IRQCHIP
select HAVE_KVM_PFNCACHE
select HAVE_KVM_IRQFD
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 11d091688346..5faba69403ac 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -253,7 +253,7 @@ bool kvm_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
#endif
-#ifdef KVM_ARCH_WANT_MMU_NOTIFIER
+#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
union kvm_mmu_notifier_arg {
pte_t pte;
};
@@ -783,7 +783,7 @@ struct kvm {
struct hlist_head irq_ack_notifier_list;
#endif
-#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
+#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
struct mmu_notifier mmu_notifier;
unsigned long mmu_invalidate_seq;
long mmu_invalidate_in_progress;
@@ -1946,7 +1946,7 @@ extern const struct _kvm_stats_desc kvm_vm_stats_desc[];
extern const struct kvm_stats_header kvm_vcpu_stats_header;
extern const struct _kvm_stats_desc kvm_vcpu_stats_desc[];
-#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
+#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
static inline int mmu_invalidate_retry(struct kvm *kvm, unsigned long mmu_seq)
{
if (unlikely(kvm->mmu_invalidate_in_progress))
diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
index 6f4737d5046a..9d1f7835d8c1 100644
--- a/include/linux/kvm_types.h
+++ b/include/linux/kvm_types.h
@@ -6,6 +6,7 @@
struct kvm;
struct kvm_async_pf;
struct kvm_device_ops;
+struct kvm_gfn_range;
struct kvm_interrupt;
struct kvm_irq_routing_table;
struct kvm_memory_slot;
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index 484d0873061c..ecae2914c97e 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -92,3 +92,7 @@ config HAVE_KVM_PM_NOTIFIER
config KVM_GENERIC_HARDWARE_ENABLING
bool
+
+config KVM_GENERIC_MMU_NOTIFIER
+ select MMU_NOTIFIER
+ bool
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 4fad3b01dc1f..8d21757cd5e9 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -535,7 +535,7 @@ void kvm_destroy_vcpus(struct kvm *kvm)
}
EXPORT_SYMBOL_GPL(kvm_destroy_vcpus);
-#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
+#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
{
return container_of(mn, struct kvm, mmu_notifier);
@@ -960,14 +960,14 @@ static int kvm_init_mmu_notifier(struct kvm *kvm)
return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
}
-#else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
+#else /* !CONFIG_KVM_GENERIC_MMU_NOTIFIER */
static int kvm_init_mmu_notifier(struct kvm *kvm)
{
return 0;
}
-#endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
+#endif /* CONFIG_KVM_GENERIC_MMU_NOTIFIER */
#ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
static int kvm_pm_notifier_call(struct notifier_block *bl,
@@ -1287,7 +1287,7 @@ static struct kvm *kvm_create_vm(unsigned long type, const char *fdname)
out_err_no_debugfs:
kvm_coalesced_mmio_free(kvm);
out_no_coalesced_mmio:
-#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
+#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
if (kvm->mmu_notifier.ops)
mmu_notifier_unregister(&kvm->mmu_notifier, current->mm);
#endif
@@ -1347,7 +1347,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
kvm->buses[i] = NULL;
}
kvm_coalesced_mmio_free(kvm);
-#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
+#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
/*
* At this point, pending calls to invalidate_range_start()
--
2.42.0.283.g2d96d420d3-goog
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