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kvm-irqchip: introduce new API to support route change

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Paolo suggested adding the new API to support route changes [1]. We should invoke
kvm_irqchip_begin_route_changes() before changing the routes, increasing the
KVMRouteChange.changes if the routes are changed, and commit the changes at last.

[1] https://lists.gnu.org/archive/html/qemu-devel/2021-11/msg02898.html

Signed-off-by: Longpeng <longpeng2@huawei.com>
Message-Id: <20220222141116.2091-2-longpeng2@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Longpeng(Mike) 2022-02-22 22:11:15 +08:00 committed by Paolo Bonzini
parent a6a7ebc817
commit 9568690868
1 changed files with 19 additions and 0 deletions
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19
include/sysemu/kvm.h
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@ -224,6 +224,11 @@ DECLARE_INSTANCE_CHECKER(KVMState, KVM_STATE,
extern KVMState *kvm_state;
typedef struct Notifier Notifier;
typedef struct KVMRouteChange {
KVMState *s;
int changes;
} KVMRouteChange;
/* external API */
bool kvm_has_free_slot(MachineState *ms);
@ -494,6 +499,20 @@ int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev);
int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
PCIDevice *dev);
void kvm_irqchip_commit_routes(KVMState *s);
static inline KVMRouteChange kvm_irqchip_begin_route_changes(KVMState *s)
{
return (KVMRouteChange) { .s = s, .changes = 0 };
}
static inline void kvm_irqchip_commit_route_changes(KVMRouteChange *c)
{
if (c->changes) {
kvm_irqchip_commit_routes(c->s);
c->changes = 0;
}
}
void kvm_irqchip_release_virq(KVMState *s, int virq);
int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter);