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-rw-r--r--virt/kvm/dirty_ring.c11
-rw-r--r--virt/kvm/kvm_main.c107
2 files changed, 89 insertions, 29 deletions
diff --git a/virt/kvm/dirty_ring.c b/virt/kvm/dirty_ring.c
index 7bc74969a819..d14ffc7513ee 100644
--- a/virt/kvm/dirty_ring.c
+++ b/virt/kvm/dirty_ring.c
@@ -11,14 +11,14 @@
#include <trace/events/kvm.h>
#include "kvm_mm.h"
-int __weak kvm_cpu_dirty_log_size(void)
+int __weak kvm_cpu_dirty_log_size(struct kvm *kvm)
{
return 0;
}
-u32 kvm_dirty_ring_get_rsvd_entries(void)
+u32 kvm_dirty_ring_get_rsvd_entries(struct kvm *kvm)
{
- return KVM_DIRTY_RING_RSVD_ENTRIES + kvm_cpu_dirty_log_size();
+ return KVM_DIRTY_RING_RSVD_ENTRIES + kvm_cpu_dirty_log_size(kvm);
}
bool kvm_use_dirty_bitmap(struct kvm *kvm)
@@ -74,14 +74,15 @@ static void kvm_reset_dirty_gfn(struct kvm *kvm, u32 slot, u64 offset, u64 mask)
KVM_MMU_UNLOCK(kvm);
}
-int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size)
+int kvm_dirty_ring_alloc(struct kvm *kvm, struct kvm_dirty_ring *ring,
+ int index, u32 size)
{
ring->dirty_gfns = vzalloc(size);
if (!ring->dirty_gfns)
return -ENOMEM;
ring->size = size / sizeof(struct kvm_dirty_gfn);
- ring->soft_limit = ring->size - kvm_dirty_ring_get_rsvd_entries();
+ ring->soft_limit = ring->size - kvm_dirty_ring_get_rsvd_entries(kvm);
ring->dirty_index = 0;
ring->reset_index = 0;
ring->index = index;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index e85b33a92624..eec82775c5bf 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -143,8 +143,6 @@ 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 kvm_enable_virtualization(void);
-static void kvm_disable_virtualization(void);
static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
@@ -1370,6 +1368,65 @@ static int kvm_vm_release(struct inode *inode, struct file *filp)
return 0;
}
+int kvm_trylock_all_vcpus(struct kvm *kvm)
+{
+ struct kvm_vcpu *vcpu;
+ unsigned long i, j;
+
+ lockdep_assert_held(&kvm->lock);
+
+ kvm_for_each_vcpu(i, vcpu, kvm)
+ if (!mutex_trylock_nest_lock(&vcpu->mutex, &kvm->lock))
+ goto out_unlock;
+ return 0;
+
+out_unlock:
+ kvm_for_each_vcpu(j, vcpu, kvm) {
+ if (i == j)
+ break;
+ mutex_unlock(&vcpu->mutex);
+ }
+ return -EINTR;
+}
+EXPORT_SYMBOL_GPL(kvm_trylock_all_vcpus);
+
+int kvm_lock_all_vcpus(struct kvm *kvm)
+{
+ struct kvm_vcpu *vcpu;
+ unsigned long i, j;
+ int r;
+
+ lockdep_assert_held(&kvm->lock);
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ r = mutex_lock_killable_nest_lock(&vcpu->mutex, &kvm->lock);
+ if (r)
+ goto out_unlock;
+ }
+ return 0;
+
+out_unlock:
+ kvm_for_each_vcpu(j, vcpu, kvm) {
+ if (i == j)
+ break;
+ mutex_unlock(&vcpu->mutex);
+ }
+ return r;
+}
+EXPORT_SYMBOL_GPL(kvm_lock_all_vcpus);
+
+void kvm_unlock_all_vcpus(struct kvm *kvm)
+{
+ struct kvm_vcpu *vcpu;
+ unsigned long i;
+
+ lockdep_assert_held(&kvm->lock);
+
+ kvm_for_each_vcpu(i, vcpu, kvm)
+ mutex_unlock(&vcpu->mutex);
+}
+EXPORT_SYMBOL_GPL(kvm_unlock_all_vcpus);
+
/*
* Allocation size is twice as large as the actual dirty bitmap size.
* See kvm_vm_ioctl_get_dirty_log() why this is needed.
@@ -3741,7 +3798,7 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up);
/*
* Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
*/
-void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
+void __kvm_vcpu_kick(struct kvm_vcpu *vcpu, bool wait)
{
int me, cpu;
@@ -3770,13 +3827,24 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
*/
if (kvm_arch_vcpu_should_kick(vcpu)) {
cpu = READ_ONCE(vcpu->cpu);
- if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
- smp_send_reschedule(cpu);
+ if (cpu != me && (unsigned int)cpu < nr_cpu_ids && cpu_online(cpu)) {
+ /*
+ * Use a reschedule IPI to kick the vCPU if the caller
+ * doesn't need to wait for a response, as KVM allows
+ * kicking vCPUs while IRQs are disabled, but using the
+ * SMP function call framework with IRQs disabled can
+ * deadlock due to taking cross-CPU locks.
+ */
+ if (wait)
+ smp_call_function_single(cpu, ack_kick, NULL, wait);
+ else
+ smp_send_reschedule(cpu);
+ }
}
out:
put_cpu();
}
-EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
+EXPORT_SYMBOL_GPL(__kvm_vcpu_kick);
#endif /* !CONFIG_S390 */
int kvm_vcpu_yield_to(struct kvm_vcpu *target)
@@ -4126,7 +4194,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, unsigned long id)
goto vcpu_free_run_page;
if (kvm->dirty_ring_size) {
- r = kvm_dirty_ring_alloc(&vcpu->dirty_ring,
+ r = kvm_dirty_ring_alloc(kvm, &vcpu->dirty_ring,
id, kvm->dirty_ring_size);
if (r)
goto arch_vcpu_destroy;
@@ -4864,7 +4932,7 @@ static int kvm_vm_ioctl_enable_dirty_log_ring(struct kvm *kvm, u32 size)
return -EINVAL;
/* Should be bigger to keep the reserved entries, or a page */
- if (size < kvm_dirty_ring_get_rsvd_entries() *
+ if (size < kvm_dirty_ring_get_rsvd_entries(kvm) *
sizeof(struct kvm_dirty_gfn) || size < PAGE_SIZE)
return -EINVAL;
@@ -5479,8 +5547,9 @@ static struct miscdevice kvm_dev = {
};
#ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING
-static bool enable_virt_at_load = true;
+bool enable_virt_at_load = true;
module_param(enable_virt_at_load, bool, 0444);
+EXPORT_SYMBOL_GPL(enable_virt_at_load);
__visible bool kvm_rebooting;
EXPORT_SYMBOL_GPL(kvm_rebooting);
@@ -5589,7 +5658,7 @@ static struct syscore_ops kvm_syscore_ops = {
.shutdown = kvm_shutdown,
};
-static int kvm_enable_virtualization(void)
+int kvm_enable_virtualization(void)
{
int r;
@@ -5634,8 +5703,9 @@ err_cpuhp:
--kvm_usage_count;
return r;
}
+EXPORT_SYMBOL_GPL(kvm_enable_virtualization);
-static void kvm_disable_virtualization(void)
+void kvm_disable_virtualization(void)
{
guard(mutex)(&kvm_usage_lock);
@@ -5646,6 +5716,7 @@ static void kvm_disable_virtualization(void)
cpuhp_remove_state(CPUHP_AP_KVM_ONLINE);
kvm_arch_disable_virtualization();
}
+EXPORT_SYMBOL_GPL(kvm_disable_virtualization);
static int kvm_init_virtualization(void)
{
@@ -5661,21 +5732,11 @@ static void kvm_uninit_virtualization(void)
kvm_disable_virtualization();
}
#else /* CONFIG_KVM_GENERIC_HARDWARE_ENABLING */
-static int kvm_enable_virtualization(void)
-{
- return 0;
-}
-
static int kvm_init_virtualization(void)
{
return 0;
}
-static void kvm_disable_virtualization(void)
-{
-
-}
-
static void kvm_uninit_virtualization(void)
{
@@ -5774,7 +5835,6 @@ static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
return -EOPNOTSUPP;
}
-/* kvm_io_bus_write - called under kvm->slots_lock */
int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
int len, const void *val)
{
@@ -5795,7 +5855,6 @@ int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
}
EXPORT_SYMBOL_GPL(kvm_io_bus_write);
-/* kvm_io_bus_write_cookie - called under kvm->slots_lock */
int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
gpa_t addr, int len, const void *val, long cookie)
{
@@ -5845,7 +5904,6 @@ static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
return -EOPNOTSUPP;
}
-/* kvm_io_bus_read - called under kvm->slots_lock */
int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
int len, void *val)
{
@@ -5864,6 +5922,7 @@ int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
r = __kvm_io_bus_read(vcpu, bus, &range, val);
return r < 0 ? r : 0;
}
+EXPORT_SYMBOL_GPL(kvm_io_bus_read);
int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
int len, struct kvm_io_device *dev)
generated by cgit (git 2.34.1) at 2025-06-03 10:07:11 +0000