Re: [PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests

From: Boris Ostrovsky
Date: Wed Nov 18 2015 - 17:05:48 EST

On 11/18/2015 03:58 PM, Andy Lutomirski wrote:
On Wed, Nov 18, 2015 at 12:50 PM, Brian Gerst <brgerst@xxxxxxxxx> wrote:

Can you just add !xen_pv_domain() to the opportunistic SYSRET check
instead? Bury the alternatives in that macro, ie.
static_cpu_has(X86_FEATURE_XENPV). That would likely benefit other
code as well.
We could, but that won't help the 64-bit case where we want to keep
the full asm path.

I don't think I understand what you mean here. Which full asm path?


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