From 70c0194337d38dd29533e63e3cb07620f8c5eae1 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Thu, 29 Aug 2024 21:35:53 -0700 Subject: [PATCH] KVM: Rename symbols related to enabling virtualization hardware Rename the various functions (and a variable) that enable virtualization to prepare for upcoming changes, and to clean up artifacts of KVM's previous behavior, which required manually juggling locks around kvm_usage_count. Drop the "nolock" qualifier from per-CPU functions now that there are no "nolock" implementations of the "all" variants, i.e. now that calling a non-nolock function from a nolock function isn't confusing (unlike this sentence). Drop "all" from the outer helpers as they no longer manually iterate over all CPUs, and because it might not be obvious what "all" refers to. In lieu of the above qualifiers, append "_cpu" to the end of the functions that are per-CPU helpers for the outer APIs. Opportunistically prepend "kvm" to all functions to help make it clear that they are KVM helpers, but mostly because there's no reason not to. Lastly, use "virtualization" instead of "hardware", because while the functions do enable virtualization in hardware, there are a _lot_ of things that KVM enables in hardware. Defer renaming the arch hooks to future patches, purely to reduce the amount of churn in a single commit. Reviewed-by: Chao Gao Reviewed-by: Kai Huang Acked-by: Kai Huang Tested-by: Farrah Chen Signed-off-by: Sean Christopherson Message-ID: <20240830043600.127750-4-seanjc@google.com> Signed-off-by: Paolo Bonzini --- virt/kvm/kvm_main.c | 42 +++++++++++++++++++++--------------------- 1 file changed, 21 insertions(+), 21 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 9ad8903b575a..4efbf9f84149 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -136,8 +136,8 @@ static int kvm_no_compat_open(struct inode *inode, struct file *file) #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl, \ .open = kvm_no_compat_open #endif -static int hardware_enable_all(void); -static void hardware_disable_all(void); +static int kvm_enable_virtualization(void); +static void kvm_disable_virtualization(void); static void kvm_io_bus_destroy(struct kvm_io_bus *bus); @@ -1220,7 +1220,7 @@ static struct kvm *kvm_create_vm(unsigned long type, const char *fdname) if (r) goto out_err_no_arch_destroy_vm; - r = hardware_enable_all(); + r = kvm_enable_virtualization(); if (r) goto out_err_no_disable; @@ -1263,7 +1263,7 @@ out_no_coalesced_mmio: mmu_notifier_unregister(&kvm->mmu_notifier, current->mm); #endif out_err_no_mmu_notifier: - hardware_disable_all(); + kvm_disable_virtualization(); out_err_no_disable: kvm_arch_destroy_vm(kvm); out_err_no_arch_destroy_vm: @@ -1360,7 +1360,7 @@ static void kvm_destroy_vm(struct kvm *kvm) #endif kvm_arch_free_vm(kvm); preempt_notifier_dec(); - hardware_disable_all(); + kvm_disable_virtualization(); mmdrop(mm); } @@ -5574,13 +5574,13 @@ static struct miscdevice kvm_dev = { __visible bool kvm_rebooting; EXPORT_SYMBOL_GPL(kvm_rebooting); -static DEFINE_PER_CPU(bool, hardware_enabled); +static DEFINE_PER_CPU(bool, virtualization_enabled); static DEFINE_MUTEX(kvm_usage_lock); static int kvm_usage_count; -static int hardware_enable_nolock(void) +static int kvm_enable_virtualization_cpu(void) { - if (__this_cpu_read(hardware_enabled)) + if (__this_cpu_read(virtualization_enabled)) return 0; if (kvm_arch_hardware_enable()) { @@ -5589,7 +5589,7 @@ static int hardware_enable_nolock(void) return -EIO; } - __this_cpu_write(hardware_enabled, true); + __this_cpu_write(virtualization_enabled, true); return 0; } @@ -5600,22 +5600,22 @@ static int kvm_online_cpu(unsigned int cpu) * be enabled. Otherwise running VMs would encounter unrecoverable * errors when scheduled to this CPU. */ - return hardware_enable_nolock(); + return kvm_enable_virtualization_cpu(); } -static void hardware_disable_nolock(void *junk) +static void kvm_disable_virtualization_cpu(void *ign) { - if (!__this_cpu_read(hardware_enabled)) + if (!__this_cpu_read(virtualization_enabled)) return; kvm_arch_hardware_disable(); - __this_cpu_write(hardware_enabled, false); + __this_cpu_write(virtualization_enabled, false); } static int kvm_offline_cpu(unsigned int cpu) { - hardware_disable_nolock(NULL); + kvm_disable_virtualization_cpu(NULL); return 0; } @@ -5634,7 +5634,7 @@ static void kvm_shutdown(void) */ pr_info("kvm: exiting hardware virtualization\n"); kvm_rebooting = true; - on_each_cpu(hardware_disable_nolock, NULL, 1); + on_each_cpu(kvm_disable_virtualization_cpu, NULL, 1); } static int kvm_suspend(void) @@ -5650,7 +5650,7 @@ static int kvm_suspend(void) lockdep_assert_not_held(&kvm_usage_lock); lockdep_assert_irqs_disabled(); - hardware_disable_nolock(NULL); + kvm_disable_virtualization_cpu(NULL); return 0; } @@ -5659,7 +5659,7 @@ static void kvm_resume(void) lockdep_assert_not_held(&kvm_usage_lock); lockdep_assert_irqs_disabled(); - WARN_ON_ONCE(hardware_enable_nolock()); + WARN_ON_ONCE(kvm_enable_virtualization_cpu()); } static struct syscore_ops kvm_syscore_ops = { @@ -5668,7 +5668,7 @@ static struct syscore_ops kvm_syscore_ops = { .shutdown = kvm_shutdown, }; -static int hardware_enable_all(void) +static int kvm_enable_virtualization(void) { int r; @@ -5711,7 +5711,7 @@ err_cpuhp: return r; } -static void hardware_disable_all(void) +static void kvm_disable_virtualization(void) { guard(mutex)(&kvm_usage_lock); @@ -5722,12 +5722,12 @@ static void hardware_disable_all(void) cpuhp_remove_state(CPUHP_AP_KVM_ONLINE); } #else /* CONFIG_KVM_GENERIC_HARDWARE_ENABLING */ -static int hardware_enable_all(void) +static int kvm_enable_virtualization(void) { return 0; } -static void hardware_disable_all(void) +static void kvm_disable_virtualization(void) { }