linux-kernel - [PATCH 3.19.y-ckt 058/128] KVM: Provide function for VCPU lookup by id

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Date:	Wed, 16 Dec 2015 09:38:18 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	David Hildenbrand <dahi@...ux.vnet.ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 058/128] KVM: Provide function for VCPU lookup by id

3.19.8-ckt12 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Hildenbrand <dahi@...ux.vnet.ibm.com>

commit db27a7a37aa0b1f8b373f8b0fb72a2ccaafb85b7 upstream.

Let's provide a function to lookup a VCPU by id.

Reviewed-by: Christian Borntraeger <borntraeger@...ibm.com>
Reviewed-by: Dominik Dingel <dingel@...ux.vnet.ibm.com>
Signed-off-by: David Hildenbrand <dahi@...ux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
[split patch from refactoring patch]
[ kamal: 3.19-stable prereq for
  b85de33 KVM: s390: avoid memory overwrites on emergency signal injection ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 include/linux/kvm_host.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 26f1060..c3aa8f4 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -438,6 +438,17 @@ static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
 	     (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
 	     idx++)
 
+static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id)
+{
+	struct kvm_vcpu *vcpu;
+	int i;
+
+	kvm_for_each_vcpu(i, vcpu, kvm)
+		if (vcpu->vcpu_id == id)
+			return vcpu;
+	return NULL;
+}
+
 #define kvm_for_each_memslot(memslot, slots)	\
 	for (memslot = &slots->memslots[0];	\
 	      memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\
-- 
1.9.1

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