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[Xen-devel] Solaris and PVRDTSCP
| To: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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| Subject: | [Xen-devel] Solaris and PVRDTSCP |
| From: | Paul Durrant <Paul.Durrant@xxxxxxxxxx> |
| Date: | Fri, 1 Jul 2011 18:02:48 +0100 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> |
| Delivery-date: | Fri, 01 Jul 2011 10:05:39 -0700 |
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| Thread-index: | Acw4ELKspf4mhTLCQZqm5dUeLpw9Tw== |
| Thread-topic: | Solaris and PVRDTSCP |
Hi, I've been trying to figure out why my copy of s10u9 did not run PV drivers when I installed it on Xen 4.1 when it was perfectly happy on Xen 3.4... It turns out that the kernel is making a check that the maximal Xen CPUID leaf is no greater than base + 2. This was true on Xen 3.4 but when the PVRDTSCP patch was added it ceased to be true with the addition of the cpuid_time_leaf code. Clearly future versions of the Solaris kernel should revise this check but to allow this kernel to enable PV drivers I was wondering what sort of workaround could be done. My current thoughts are along the lines of disabling the extra CPUID leaf if tsc_mode is < TSC_MODE_PVRDTSCP. An alternative might be to introduce another tsc_mode that specifically causes the leaf to be obscured. Thoughts? Paul _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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