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KVM: Allow building irqbypass.ko as as module when kvm.ko is a module

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commit 459a35111b upstream.

Convert HAVE_KVM_IRQ_BYPASS into a tristate so that selecting
IRQ_BYPASS_MANAGER follows KVM={m,y}, i.e. doesn't force irqbypass.ko to
be built-in.

Note, PPC allows building KVM as a module, but selects HAVE_KVM_IRQ_BYPASS
from a boolean Kconfig, i.e. KVM PPC unnecessarily forces irqbpass.ko to
be built-in.  But that flaw is a longstanding PPC specific issue.

Fixes: 61df71ee99 ("kvm: move "select IRQ_BYPASS_MANAGER" to common code")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20250315024623.2363994-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Christopherson 2025-03-14 19:46:23 -07:00 committed by Greg Kroah-Hartman
parent 3bc2208c74
commit fae0a8796c
3 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/kvm_host.h
View File

@ -2330,7 +2330,7 @@ static inline bool kvm_is_visible_memslot(struct kvm_memory_slot *memslot)
struct kvm_vcpu *kvm_get_running_vcpu(void);
struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
#if IS_ENABLED(CONFIG_HAVE_KVM_IRQ_BYPASS)
bool kvm_arch_has_irq_bypass(void);
int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *,
struct irq_bypass_producer *);

2
virt/kvm/Kconfig
View File

@ -75,7 +75,7 @@ config KVM_COMPAT
depends on KVM && COMPAT && !(S390 || ARM64 || RISCV)
config HAVE_KVM_IRQ_BYPASS
bool
tristate
select IRQ_BYPASS_MANAGER
config HAVE_KVM_VCPU_ASYNC_IOCTL

10
virt/kvm/eventfd.c
View File

@ -149,7 +149,7 @@ irqfd_shutdown(struct work_struct *work)
/*
* It is now safe to release the object's resources
*/
#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
#if IS_ENABLED(CONFIG_HAVE_KVM_IRQ_BYPASS)
irq_bypass_unregister_consumer(&irqfd->consumer);
#endif
eventfd_ctx_put(irqfd->eventfd);
@ -274,7 +274,7 @@ static void irqfd_update(struct kvm *kvm, struct kvm_kernel_irqfd *irqfd)
write_seqcount_end(&irqfd->irq_entry_sc);
}
#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
#if IS_ENABLED(CONFIG_HAVE_KVM_IRQ_BYPASS)
void __attribute__((weak)) kvm_arch_irq_bypass_stop(
struct irq_bypass_consumer *cons)
{
@ -425,7 +425,7 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
if (events & EPOLLIN)
schedule_work(&irqfd->inject);
#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
#if IS_ENABLED(CONFIG_HAVE_KVM_IRQ_BYPASS)
if (kvm_arch_has_irq_bypass()) {
irqfd->consumer.token = (void *)irqfd->eventfd;
irqfd->consumer.add_producer = kvm_arch_irq_bypass_add_producer;
@ -618,14 +618,14 @@ void kvm_irq_routing_update(struct kvm *kvm)
spin_lock_irq(&kvm->irqfds.lock);
list_for_each_entry(irqfd, &kvm->irqfds.items, list) {
#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
#if IS_ENABLED(CONFIG_HAVE_KVM_IRQ_BYPASS)
/* Under irqfds.lock, so can read irq_entry safely */
struct kvm_kernel_irq_routing_entry old = irqfd->irq_entry;
#endif
irqfd_update(kvm, irqfd);
#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
#if IS_ENABLED(CONFIG_HAVE_KVM_IRQ_BYPASS)
if (irqfd->producer &&
kvm_arch_irqfd_route_changed(&old, &irqfd->irq_entry)) {
int ret = kvm_arch_update_irqfd_routing(