On Fri, Mar 26, 2021 at 11:39:18PM -0400, Len Brown wrote: > Hi Andy, > > Say a mainline links with a math library that uses AMX without the > knowledge of the mainline. What does this mean? What happened to the context here? > Say the mainline is also linked with a userspace threading library > that thinks it has a concept of XSAVE area size. How can the kernel (what I think you mean by "mainline" here) be linked with a userspace library at all? > Wouldn't the change in XCR0, resulting in XSAVE size change, risk > confusing the threading library? Shouldn't that be the job of the kernel and not userspace? totally confused, greg k-h
