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Re: [Xen-devel] [PATCH] x86-64: clear DF for kernel when forwarding sysc
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] x86-64: clear DF for kernel when forwarding syscall |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Sun, 24 Jun 2007 23:02:09 +0100 |
| Delivery-date: | Sun, 24 Jun 2007 15:00:17 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH] x86-64: clear DF for kernel when forwarding syscall |
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On 24/6/07 11:58, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: > I had sent a mail to that effect (at least I think I had) - on x86-64, this > may > be the preferred way (at least for the !XEN_COMPAT case), but the i386 > kernel has to remain runnable on 32-bit Xen, and doing gp-fault-recoverable > MSR accesses doesn't buy us anything in terms of not needing specialized > Xen code (i.e. if we need special Xen code, we can equally well do > hypercalls). > For that reason, at this point I implemented both access methods, but haven't > got around yet to make the kernel side use them. The only problem is it probably requires an entirely new top-level hypercall because it's not going to fit into the constraints of the existing callback_op(). -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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