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RISC-V: KVM: use kvm_trylock_all_vcpus when locking all vCPUs

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Use kvm_trylock_all_vcpus instead of a custom implementation when locking
all vCPUs of a VM.

Compile tested only.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Anup Patel <anup@brainfault.org>
Tested-by: Anup Patel <anup@brainfault.org>
Message-ID: <20250512180407.659015-7-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Maxim Levitsky 2025-05-12 14:04:07 -04:00 committed by Paolo Bonzini
parent b586c5d219
commit 8f56770d11
1 changed files with 2 additions and 32 deletions
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34
arch/riscv/kvm/aia_device.c
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@ -12,36 +12,6 @@
#include <linux/kvm_host.h>
#include <linux/uaccess.h>
static void unlock_vcpus(struct kvm *kvm, int vcpu_lock_idx)
{
struct kvm_vcpu *tmp_vcpu;
for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
tmp_vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx);
mutex_unlock(&tmp_vcpu->mutex);
}
}
static void unlock_all_vcpus(struct kvm *kvm)
{
unlock_vcpus(kvm, atomic_read(&kvm->online_vcpus) - 1);
}
static bool lock_all_vcpus(struct kvm *kvm)
{
struct kvm_vcpu *tmp_vcpu;
unsigned long c;
kvm_for_each_vcpu(c, tmp_vcpu, kvm) {
if (!mutex_trylock(&tmp_vcpu->mutex)) {
unlock_vcpus(kvm, c - 1);
return false;
}
}
return true;
}
static int aia_create(struct kvm_device *dev, u32 type)
{
int ret;
@ -53,7 +23,7 @@ static int aia_create(struct kvm_device *dev, u32 type)
return -EEXIST;
ret = -EBUSY;
if (!lock_all_vcpus(kvm))
if (kvm_trylock_all_vcpus(kvm))
return ret;
kvm_for_each_vcpu(i, vcpu, kvm) {
@ -65,7 +35,7 @@ static int aia_create(struct kvm_device *dev, u32 type)
kvm->arch.aia.in_kernel = true;
out_unlock:
unlock_all_vcpus(kvm);
kvm_unlock_all_vcpus(kvm);
return ret;
}