KVM: vmx, svm: clean up mass updates to regs_avail/regs_dirty bits
Document the meaning of the three combinations of regs_avail and
regs_dirty. Update regs_dirty just after writeback instead of
doing it later after vmexit. After vmexit, instead, we clear the
regs_avail bits corresponding to lazily-loaded registers.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index b240776..dc5041a 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -269,7 +269,13 @@ static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, struct loaded_vmcs *vmcs)
vmx_sync_vmcs_host_state(vmx, prev);
put_cpu();
- vmx_register_cache_reset(vcpu);
+ vcpu->arch.regs_avail = ~VMX_REGS_LAZY_LOAD_SET;
+
+ /*
+ * All lazily updated registers will be reloaded from VMCS12 on both
+ * vmentry and vmexit.
+ */
+ vcpu->arch.regs_dirty = 0;
}
/*