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[Xen-devel][PATCH 02/02] VMX: Add HVM RDTSCP support
| To: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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| Subject: | [Xen-devel][PATCH 02/02] VMX: Add HVM RDTSCP support |
| From: | "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx> |
| Date: | Fri, 11 Dec 2009 19:53:41 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Delivery-date: | Fri, 11 Dec 2009 03:55:05 -0800 |
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| Thread-topic: | [Xen-devel][PATCH 02/02] VMX: Add HVM RDTSCP support |
Add RDTSCP instruction support for HVM VMX guest. - RDTSCP is introduced in Nehalem processor on Intel platform. Like RDTSC, RDTSCP will return the TSC value, besides, it will return the low 32bit of TSC_AUX MSR. Currently Linux kernel will write (node_id << 12 | process_id) into that MSR, so that when guest execs RDTSCP, it will also get processor information. - This instruction is supported for HVM only when the hardware has this capability (indicated by cpuid). Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
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