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[Xen-devel] sysenter/syscall support for 32-on-64 guests?
| To: | Jan Beulich <jbeulich@xxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] sysenter/syscall support for 32-on-64 guests? |
| From: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
| Date: | Thu, 28 Feb 2008 08:49:56 -0800 |
| Cc: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Campbell <ijc@xxxxxxxxxxxxxx> |
| Delivery-date: | Thu, 28 Feb 2008 08:54:14 -0800 |
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I just spent quite a while working out why pvops-Xen kernels weren't
booting for me in a 64-bit hypervisor. It turned out to be because
32-on-64 supports SEP even though 32-on-32 doesn't, so the guest kernel
was trying to use it without having set up the Xen side, resulting in
syscalls jumping to 0:0, generating a mysterious GP. Once I worked that
out, the fix was simple, of course.
Anyway, I wonder if you had a specific reason for allowing this, other than "because we can"? It seems to me that we should try to minimize the number of differences between 32-on-32 and 32-on-64 as much as possible. J _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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