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authorAvi Kivity <avi@qumranet.com>2007-02-21 18:04:26 +0200
committerAvi Kivity <avi@qumranet.com>2007-03-04 11:12:42 +0200
commitbccf2150fe62dda5fb09efa2f64d2a234694eb48 (patch)
treeb5e6fc6440b864ddd1c32c4cee1916a0c5484c63 /drivers/kvm/kvm.h
parentc5ea76600653b1a242321734435cb1c54778941a (diff)
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KVM: Per-vcpu inodes
Allocate a distinct inode for every vcpu in a VM. This has the following benefits: - the filp cachelines are no longer bounced when f_count is incremented on every ioctl() - the API and internal code are distinctly clearer; for example, on the KVM_GET_REGS ioctl, there is no need to copy the vcpu number from userspace and then copy the registers back; the vcpu identity is derived from the fd used to make the call Right now the performance benefits are completely theoretical since (a) we don't support more than one vcpu per VM and (b) virtualization hardware inefficiencies completely everwhelm any cacheline bouncing effects. But both of these will change, and we need to prepare the API today. Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/kvm.h')
-rw-r--r--drivers/kvm/kvm.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 41cc27d..0d122bf 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -309,6 +309,7 @@ struct kvm {
int busy;
unsigned long rmap_overflow;
struct list_head vm_list;
+ struct file *filp;
};
struct kvm_stat {
@@ -343,7 +344,7 @@ struct kvm_arch_ops {
int (*vcpu_create)(struct kvm_vcpu *vcpu);
void (*vcpu_free)(struct kvm_vcpu *vcpu);
- struct kvm_vcpu *(*vcpu_load)(struct kvm_vcpu *vcpu);
+ void (*vcpu_load)(struct kvm_vcpu *vcpu);
void (*vcpu_put)(struct kvm_vcpu *vcpu);
void (*vcpu_decache)(struct kvm_vcpu *vcpu);