Re: [PATCH v13 44/48] KVM: selftests: Stuff RAX/RCX with 'safe' values in vmmcall()/vmcall()

[Sean Christopherson]

On Tue, Nov 01, 2022, Vitaly Kuznetsov wrote:
> vmmcall()/vmcall() are used to exit from L2 to L1 and no concrete hypercall
> ABI is currenty followed. With the introduction of Hyper-V L2 TLB flush
> it becomes (theoretically) possible that L0 will take responsibility for
> handling the call and no L1 exit will happen. Prevent this by stuffing RAX
> (KVM ABI) and RCX (Hyper-V ABI) with 'safe' values.
> 
> While on it, convert vmmcall() to 'static inline', make it setup stack
> frame and move to include/x86_64/svm_util.h.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
> ---

Reviewed-by: Sean Christopherson <seanjc@xxxxxxxxxx>