On Mon, Mar 29, 2021 at 1:43 PM Andy Lutomirski <l...@amacapital.net> wrote:
> > *switching* XCR0 on context switch is slow, but perfectly legal. > > How slow is it? And how slow is switching XFD? XFD is definitely > serializing? XCR0 writes in a VM guest cause a VMEXIT.. XCR writes in a VM guest do not. I will find out what the relative cost is on bare metal, where VMEXIT is not an issue. -- Len Brown, Intel Open Source Technology Center
