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accel/kvm: Add pre-park vCPU support

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For that KVM do not support dynamic adjustment of vCPU count,
we must pre-park all possible vCPU at start.

Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
(cherry picked from commit 000c4a3d545146ee38ea4334fee3a93669c11b28)
This commit is contained in:
Chen Qun 2020-04-10 13:04:40 +08:00 committed by yezengruan
parent a76764d7b7
commit 57a390f44f
1 changed files with 64 additions and 0 deletions
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accel-kvm-Add-pre-park-vCPU-support.patch Normal file
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@ -0,0 +1,64 @@
From c950cda47386360e37a89dfa7029d83e33888a40 Mon Sep 17 00:00:00 2001
From: Keqian Zhu <zhukeqian1@huawei.com>
Date: Fri, 10 Apr 2020 13:04:40 +0800
Subject: [PATCH] accel/kvm: Add pre-park vCPU support
For that KVM do not support dynamic adjustment of vCPU count,
we must pre-park all possible vCPU at start.
Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
---
accel/kvm/kvm-all.c | 23 +++++++++++++++++++++++
include/sysemu/kvm.h | 1 +
2 files changed, 24 insertions(+)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 8a98446b7c..f2ce5cd45a 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -433,6 +433,29 @@ void kvm_destroy_vcpu(CPUState *cpu)
}
}
+int kvm_create_parked_vcpu(unsigned long vcpu_id)
+{
+ KVMState *s = kvm_state;
+ struct KVMParkedVcpu *vcpu = NULL;
+ int ret;
+
+ DPRINTF("kvm_create_parked_vcpu\n");
+
+ ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id);
+ if (ret < 0) {
+ DPRINTF("kvm_create_vcpu failed\n");
+ goto err;
+ }
+
+ vcpu = g_malloc0(sizeof(*vcpu));
+ vcpu->vcpu_id = vcpu_id;
+ vcpu->kvm_fd = ret;
+ QLIST_INSERT_HEAD(&s->kvm_parked_vcpus, vcpu, node);
+
+err:
+ return ret;
+}
+
static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id)
{
struct KVMParkedVcpu *cpu;
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 7b22aeb6ae..2623775c27 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -221,6 +221,7 @@ int kvm_has_pit_state2(void);
int kvm_has_many_ioeventfds(void);
int kvm_has_gsi_routing(void);
int kvm_has_intx_set_mask(void);
+int kvm_create_parked_vcpu(unsigned long vcpu_id);
/**
* kvm_arm_supports_user_irq
--
2.27.0