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SubjectRe: [PATCH] KVM: X86: Make fpu allocation a common function
On Mon, Oct 14, 2019 at 06:58:49PM +0200, Vitaly Kuznetsov wrote:
> Xiaoyao Li <xiaoyao.li@intel.com> writes:
>
> > They are duplicated codes to create vcpu.arch.{user,guest}_fpu in VMX
> > and SVM. Make them common functions.
> >
> > No functional change intended.
>
> Would it rather make sense to move this code to
> kvm_arch_vcpu_create()/kvm_arch_vcpu_destroy() instead?

Does it make sense? Yes. Would it actually work? No. Well, not without
other shenanigans.

FPU allocation can't be placed after the call to .create_vcpu() becuase
it's consumed in kvm_arch_vcpu_init(). FPU allocation can't come before
.create_vcpu() because the vCPU struct itself hasn't been allocated. The
latter could be solved by passed the FPU pointer into .create_vcpu(), but
that's a bit ugly and is not a precedent we want to set.

At a glance, FPU allocation can be moved to kvm_arch_vcpu_init(), maybe
right before the call to fx_init().

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