在 2023年02月22日 20:17, Paolo Bonzini 写道:
On 2/22/23 02:52, Tianrui Zhao wrote:
+ vcpu->arch.guest_eentry = (unsigned long)kvm_context->kvm_eentry;
+ vcpu->arch.vcpu_run = kvm_context->kvm_enter_guest;
+ vcpu->arch.handle_exit = _kvm_handle_exit;
Here as well, whatever is constant must not be stored in struct
kvm_arch_vcpu.
Paolo
Thanks, we use this in vcpu_arch because the vcpu_arch is used as
argument in switch.S' methods, we can quickly access the guest_eentry
and handle_exit by using the KVM_ARCH_GEENTRY, KVM_ARCH_HANDLE_EXIT
offsets. If we change to global variable , we should relocate it in
switch.S and may lead to lower accessing speed.
For guest_eentry and handle_exit this is correct so you can add a
comment in kvm_host.h, like
/* Pointers stored here for easy access from assembly code. */
However, vcpu->arch.vcpu_run is not used in switch.S so there is no
need to store it in struct kvm_arch_vcpu. Since you're already going
to move kvm_enter_guest out of kvm_context and into a global variable,
please give it the right pointer-to-function type instead of using
unsigned long.
Paolo
Thanks, I will remove this vcpu_run and replace it with the new global
variable, and fix the pointer-to-function type.
Thanks
Tianrui Zhao
