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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Marc Zyngier <maz@kernel.org>, James Hogan <jhogan@kernel.org>,
	Paul Mackerras <paulus@ozlabs.org>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Janosch Frank <frankja@linux.ibm.com>,
	Paolo Bonzini <pbonzini@redhat.com>
Cc: James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	David Hildenbrand <david@redhat.com>,
	Cornelia Huck <cohuck@redhat.com>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org,
	kvm-ppc@vger.kernel.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, Greg Kurz <groug@kaod.org>
Subject: [PATCH v2 15/45] KVM: PPC: Move kvm_vcpu_init() invocation to common code
Date: Wed, 18 Dec 2019 13:55:00 -0800	[thread overview]
Message-ID: <20191218215530.2280-16-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20191218215530.2280-1-sean.j.christopherson@intel.com>

Move the kvm_cpu_{un}init() calls to common PPC code as an intermediate
step towards removing kvm_cpu_{un}init() altogether.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/powerpc/include/asm/kvm_ppc.h |  3 +--
 arch/powerpc/kvm/book3s.c          |  5 ++---
 arch/powerpc/kvm/book3s_hv.c       | 17 ++++++-----------
 arch/powerpc/kvm/book3s_pr.c       | 13 +++----------
 arch/powerpc/kvm/booke.c           |  5 ++---
 arch/powerpc/kvm/e500.c            | 16 +++-------------
 arch/powerpc/kvm/e500mc.c          | 12 ++----------
 arch/powerpc/kvm/powerpc.c         | 10 +++++++++-
 8 files changed, 28 insertions(+), 53 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 8f77ca5ace6f..374e4b835ff0 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -119,8 +119,7 @@ extern int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr,
 			enum xlate_instdata xlid, enum xlate_readwrite xlrw,
 			struct kvmppc_pte *pte);
 
-extern int kvmppc_core_vcpu_create(struct kvm *kvm, struct kvm_vcpu *vcpu,
-				   unsigned int id);
+extern int kvmppc_core_vcpu_create(struct kvm_vcpu *vcpu);
 extern void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu);
 extern int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu);
 extern int kvmppc_core_check_processor_compat(void);
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 13385656b90d..5ad20fc0c6a1 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -789,10 +789,9 @@ void kvmppc_decrementer_func(struct kvm_vcpu *vcpu)
 	kvm_vcpu_kick(vcpu);
 }
 
-int kvmppc_core_vcpu_create(struct kvm *kvm, struct kvm_vcpu *vcpu,
-			    unsigned int id)
+int kvmppc_core_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	return kvm->arch.kvm_ops->vcpu_create(kvm, vcpu, id);
+	return kvm->arch.kvm_ops->vcpu_create(vcpu);
 }
 
 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 3fb41fe24f58..d3d9a03a61fd 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -2271,16 +2271,16 @@ static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
 }
 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
 
-static int kvmppc_core_vcpu_create_hv(struct kvm *kvm, struct kvm_vcpu *vcpu,
-				      unsigned int id)
+static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu)
 {
 	int err;
 	int core;
 	struct kvmppc_vcore *vcore;
+	struct kvm *kvm;
+	unsigned int id;
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		return err;
+	kvm = vcpu->kvm;
+	id = vcpu->vcpu_id;
 
 	vcpu->arch.shared = &vcpu->arch.shregs;
 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
@@ -2362,7 +2362,7 @@ static int kvmppc_core_vcpu_create_hv(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	mutex_unlock(&kvm->lock);
 
 	if (!vcore)
-		goto uninit_vcpu;
+		return err;
 
 	spin_lock(&vcore->lock);
 	++vcore->num_threads;
@@ -2378,10 +2378,6 @@ static int kvmppc_core_vcpu_create_hv(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	debugfs_vcpu_init(vcpu, id);
 
 	return 0;
-
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
-	return err;
 }
 
 static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode,
@@ -2435,7 +2431,6 @@ static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
 	unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
 	unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
 	spin_unlock(&vcpu->arch.vpa_update_lock);
-	kvm_vcpu_uninit(vcpu);
 }
 
 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 10c65d412e81..d88f708d5be3 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -1744,22 +1744,17 @@ static int kvmppc_set_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
 	return r;
 }
 
-static int kvmppc_core_vcpu_create_pr(struct kvm *kvm, struct kvm_vcpu *vcpu,
-				      unsigned int id)
+static int kvmppc_core_vcpu_create_pr(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_vcpu_book3s *vcpu_book3s;
 	unsigned long p;
 	int err;
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		return err;
-
 	err = -ENOMEM;
 
 	vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
 	if (!vcpu_book3s)
-		goto uninit_vcpu;
+		goto out;
 	vcpu->arch.book3s = vcpu_book3s;
 
 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
@@ -1814,8 +1809,7 @@ static int kvmppc_core_vcpu_create_pr(struct kvm *kvm, struct kvm_vcpu *vcpu,
 free_vcpu3s:
 #endif
 	vfree(vcpu_book3s);
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
+out:
 	return err;
 }
 
@@ -1824,7 +1818,6 @@ static void kvmppc_core_vcpu_free_pr(struct kvm_vcpu *vcpu)
 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 
 	free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
-	kvm_vcpu_uninit(vcpu);
 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
 	kfree(vcpu->arch.shadow_vcpu);
 #endif
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 047c9f707704..dd7440e50c7a 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -2114,10 +2114,9 @@ int kvmppc_core_init_vm(struct kvm *kvm)
 	return kvm->arch.kvm_ops->init_vm(kvm);
 }
 
-int kvmppc_core_vcpu_create(struct kvm *kvm, struct kvm_vcpu *vcpu,
-			    unsigned int id)
+int kvmppc_core_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	return kvm->arch.kvm_ops->vcpu_create(kvm, vcpu, id);
+	return kvm->arch.kvm_ops->vcpu_create(vcpu);
 }
 
 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c
index 96d9cde3d2e3..942bfaa2d1d0 100644
--- a/arch/powerpc/kvm/e500.c
+++ b/arch/powerpc/kvm/e500.c
@@ -433,8 +433,7 @@ static int kvmppc_set_one_reg_e500(struct kvm_vcpu *vcpu, u64 id,
 	return r;
 }
 
-static int kvmppc_core_vcpu_create_e500(struct kvm *kvm, struct kvm_vcpu *vcpu,
-					unsigned int id)
+static int kvmppc_core_vcpu_create_e500(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_vcpu_e500 *vcpu_e500;
 	int err;
@@ -442,14 +441,8 @@ static int kvmppc_core_vcpu_create_e500(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
 	vcpu_e500 = to_e500(vcpu);
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		return err;
-
-	if (kvmppc_e500_id_table_alloc(vcpu_e500) == NULL) {
-		err = -ENOMEM;
-		goto uninit_vcpu;
-	}
+	if (kvmppc_e500_id_table_alloc(vcpu_e500) == NULL)
+		return -ENOMEM;
 
 	err = kvmppc_e500_tlb_init(vcpu_e500);
 	if (err)
@@ -467,8 +460,6 @@ static int kvmppc_core_vcpu_create_e500(struct kvm *kvm, struct kvm_vcpu *vcpu,
 	kvmppc_e500_tlb_uninit(vcpu_e500);
 uninit_id:
 	kvmppc_e500_id_table_free(vcpu_e500);
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
 	return err;
 }
 
@@ -479,7 +470,6 @@ static void kvmppc_core_vcpu_free_e500(struct kvm_vcpu *vcpu)
 	free_page((unsigned long)vcpu->arch.shared);
 	kvmppc_e500_tlb_uninit(vcpu_e500);
 	kvmppc_e500_id_table_free(vcpu_e500);
-	kvm_vcpu_uninit(vcpu);
 }
 
 static int kvmppc_core_init_vm_e500(struct kvm *kvm)
diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
index f2902e612150..fc4fe922e893 100644
--- a/arch/powerpc/kvm/e500mc.c
+++ b/arch/powerpc/kvm/e500mc.c
@@ -301,8 +301,7 @@ static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
 	return r;
 }
 
-static int kvmppc_core_vcpu_create_e500mc(struct kvm *kvm, struct kvm_vcpu *vcpu,
-					  unsigned int id)
+static int kvmppc_core_vcpu_create_e500mc(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_vcpu_e500 *vcpu_e500;
 	int err;
@@ -310,16 +309,12 @@ static int kvmppc_core_vcpu_create_e500mc(struct kvm *kvm, struct kvm_vcpu *vcpu
 	BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
 	vcpu_e500 = to_e500(vcpu);
 
-	err = kvm_vcpu_init(vcpu, kvm, id);
-	if (err)
-		return err;
-
 	/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
 	vcpu->arch.oldpir = 0xffffffff;
 
 	err = kvmppc_e500_tlb_init(vcpu_e500);
 	if (err)
-		goto uninit_vcpu;
+		return err;
 
 	vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
 	if (!vcpu->arch.shared) {
@@ -331,8 +326,6 @@ static int kvmppc_core_vcpu_create_e500mc(struct kvm *kvm, struct kvm_vcpu *vcpu
 
 uninit_tlb:
 	kvmppc_e500_tlb_uninit(vcpu_e500);
-uninit_vcpu:
-	kvm_vcpu_uninit(vcpu);
 	return err;
 }
 
@@ -342,7 +335,6 @@ static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
 
 	free_page((unsigned long)vcpu->arch.shared);
 	kvmppc_e500_tlb_uninit(vcpu_e500);
-	kvm_vcpu_uninit(vcpu);
 }
 
 static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index fd978f681b66..173f57e0a1b5 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -729,14 +729,20 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 	if (!vcpu)
 		return ERR_PTR(-ENOMEM);
 
-	err = kvmppc_core_vcpu_create(kvm, vcpu, id);
+	err = kvm_vcpu_init(vcpu, kvm, id);
 	if (err)
 		goto free_vcpu;
 
+	err = kvmppc_core_vcpu_create(vcpu);
+	if (err)
+		goto uninit_vcpu;
+
 	vcpu->arch.wqp = &vcpu->wq;
 	kvmppc_create_vcpu_debugfs(vcpu, id);
 	return vcpu;
 
+uninit_vcpu:
+	kvm_vcpu_uninit(vcpu);
 free_vcpu:
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 	return ERR_PTR(err);
@@ -770,6 +776,8 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 
 	kvmppc_core_vcpu_free(vcpu);
 
+	kvm_vcpu_uninit(vcpu);
+
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 }
 
-- 
2.24.1


  parent reply	other threads:[~2019-12-18 21:58 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-18 21:54 [PATCH v2 00/45] KVM: Refactor vCPU creation Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 01/45] KVM: PPC: Book3S HV: Uninit vCPU if vcore creation fails Sean Christopherson
2020-01-20  2:57   ` Paul Mackerras
2019-12-18 21:54 ` [PATCH v2 02/45] KVM: PPC: Book3S PR: Free shared page if mmu initialization fails Sean Christopherson
2020-01-20  3:00   ` Paul Mackerras
2019-12-18 21:54 ` [PATCH v2 03/45] KVM: x86: Free wbinvd_dirty_mask if vCPU creation fails Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 04/45] KVM: VMX: Allocate VPID after initializing VCPU Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 05/45] KVM: VMX: Use direct vcpu pointer during vCPU create/free Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 06/45] KVM: SVM: " Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 07/45] KVM: x86: Allocate vcpu struct in common x86 code Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 08/45] KVM: x86: Move FPU allocation to " Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 09/45] KVM: x86: Move allocation of pio_data page down a few lines Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 10/45] KVM: x86: Move kvm_vcpu_init() invocation to common code Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 11/45] KVM: PPC: e500mc: Add build-time assert that vcpu is at offset 0 Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 12/45] KVM: PPC: Allocate vcpu struct in common PPC code Sean Christopherson
2020-01-20  4:04   ` Paul Mackerras
2020-01-21 11:05     ` Paolo Bonzini
2020-01-21 23:18       ` Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 13/45] KVM: PPC: Book3S PR: Allocate book3s and shadow vcpu after common init Sean Christopherson
2019-12-18 21:54 ` [PATCH v2 14/45] KVM: PPC: e500mc: Move reset of oldpir below call to kvm_vcpu_init() Sean Christopherson
2019-12-18 21:55 ` Sean Christopherson [this message]
2020-01-20  3:34   ` [PATCH v2 15/45] KVM: PPC: Move kvm_vcpu_init() invocation to common code Paul Mackerras
2020-01-21 11:08     ` Paolo Bonzini
2020-01-20  3:56   ` Paul Mackerras
2019-12-18 21:55 ` [PATCH v2 16/45] KVM: MIPS: Use kvm_vcpu_cache to allocate vCPUs Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 17/45] KVM: MIPS: Drop kvm_arch_vcpu_free() Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 18/45] KVM: PPC: " Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 19/45] KVM: arm: " Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 20/45] KVM: x86: Remove spurious kvm_mmu_unload() from vcpu destruction path Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 21/45] KVM: x86: Remove spurious clearing of async #PF MSR Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 22/45] KVM: x86: Drop kvm_arch_vcpu_free() Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 23/45] KVM: Remove kvm_arch_vcpu_free() declaration Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 24/45] KVM: Add kvm_arch_vcpu_precreate() to handle pre-allocation issues Sean Christopherson
2019-12-19 19:28   ` Cornelia Huck
2019-12-18 21:55 ` [PATCH v2 25/45] KVM: s390: Move guts of kvm_arch_vcpu_init() into kvm_arch_vcpu_create() Sean Christopherson
2019-12-19 19:39   ` Cornelia Huck
2019-12-18 21:55 ` [PATCH v2 26/45] KVM: s390: Invoke kvm_vcpu_init() before allocating sie_page Sean Christopherson
2019-12-19 19:47   ` Cornelia Huck
2019-12-18 21:55 ` [PATCH v2 27/45] KVM: MIPS: Invoke kvm_vcpu_uninit() immediately prior to freeing vcpu Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 28/45] KVM: x86: " Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 29/45] KVM: Introduce kvm_vcpu_destroy() Sean Christopherson
2019-12-19 19:51   ` Cornelia Huck
2019-12-18 21:55 ` [PATCH v2 30/45] KVM: Move vcpu alloc and init invocation to common code Sean Christopherson
2019-12-20  9:33   ` Cornelia Huck
2019-12-20 15:53     ` Sean Christopherson
2019-12-20 16:00       ` Cornelia Huck
2020-01-26  3:02   ` Guenter Roeck
2019-12-18 21:55 ` [PATCH v2 31/45] KVM: Unexport kvm_vcpu_cache and kvm_vcpu_{un}init() Sean Christopherson
2019-12-20  9:39   ` Cornelia Huck
2019-12-18 21:55 ` [PATCH v2 32/45] KVM: Move initialization of preempt notifier to kvm_vcpu_init() Sean Christopherson
2019-12-20  9:50   ` Cornelia Huck
2019-12-18 21:55 ` [PATCH v2 33/45] KVM: x86: Move guts of kvm_arch_vcpu_setup() into kvm_arch_vcpu_create() Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 34/45] KVM: MIPS: Move .vcpu_setup() call to kvm_arch_vcpu_create() Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 35/45] KVM: s390: Manually invoke vcpu setup during kvm_arch_vcpu_create() Sean Christopherson
2019-12-20 10:04   ` Cornelia Huck
2019-12-20 15:56     ` Sean Christopherson
2019-12-20 16:02       ` Cornelia Huck
2019-12-20 16:22         ` Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 36/45] KVM: PPC: BookE: Setup vcpu during kvmppc_core_vcpu_create() Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 37/45] KVM: Drop kvm_arch_vcpu_setup() Sean Christopherson
2019-12-20 10:06   ` Cornelia Huck
2019-12-18 21:55 ` [PATCH v2 38/45] KVM: x86: Move all vcpu init code into kvm_arch_vcpu_create() Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 39/45] KVM: MIPS: " Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 40/45] KVM: ARM: " Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 41/45] KVM: PPC: " Sean Christopherson
2020-01-20  3:46   ` Paul Mackerras
2020-01-21 11:12     ` Paolo Bonzini
2019-12-18 21:55 ` [PATCH v2 42/45] KVM: arm64: Free sve_state via arm specific hook Sean Christopherson
2019-12-18 21:55 ` [PATCH v2 43/45] KVM: Drop kvm_arch_vcpu_init() and kvm_arch_vcpu_uninit() Sean Christopherson
2019-12-20 10:13   ` Cornelia Huck
2019-12-18 21:55 ` [PATCH v2 44/45] KVM: Move putting of vcpu->pid to kvm_vcpu_destroy() Sean Christopherson
2019-12-20 10:16   ` Cornelia Huck
2019-12-18 21:55 ` [PATCH v2 45/45] KVM: Move vcpu->run page allocation out of kvm_vcpu_init() Sean Christopherson
2019-12-20 10:30   ` Cornelia Huck
2020-01-18 20:01 ` [PATCH v2 00/45] KVM: Refactor vCPU creation Paolo Bonzini

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