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KVM: Add kvm_vcpu_get_idx to get vcpu index in kvm->vcpus 

There are occasional needs to use the index of vcpu in the kvm->vcpus
array to map something related to a VCPU.  For example, unlike the
vcpu->vcpu_id, the vcpu index is guaranteed to not be sparse across all
vcpus which is useful when allocating a memory area for each vcpu.

Signed-off-by: Christoffer Dall <cdall@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
This commit is contained in:
Christoffer Dall 2017-05-08 20:38:40 +02:00
parent 443c3a9e68
commit 497d72d80a
1 changed files with 11 additions and 0 deletions
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11
include/linux/kvm_host.h
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@ -490,6 +490,17 @@ static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id)
return NULL; return NULL;
} }
static inline int kvm_vcpu_get_idx(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu *tmp;
int idx;
kvm_for_each_vcpu(idx, tmp, vcpu->kvm)
if (tmp == vcpu)
return idx;
BUG();
}
#define kvm_for_each_memslot(memslot, slots) \ #define kvm_for_each_memslot(memslot, slots) \
for (memslot = &slots->memslots[0]; \ for (memslot = &slots->memslots[0]; \
memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\ memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\