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[Xen-devel] Re: x2APIC emulation for HVM guest

  • To: "Yang, Sheng" <sheng.yang@xxxxxxxxx>
  • From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
  • Date: Thu, 02 Dec 2010 06:31:09 +0100
  • Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
  • Delivery-date: Wed, 01 Dec 2010 21:31:58 -0800
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On 12/02/2010 03:09 AM, Yang, Sheng wrote:

This patch would enable Xen to handle x2APIC MSR accessing of HVM guest, which 
is
faster(avoid decoding of MMIO accessing). The credit comes to Gleb Natapov who
complete the work for KVM.
Compared to Gleb's patch, I think yours is missing support for directed EOI in the LAPIC emulation. Linux doesn't use it, but I think it's easy enough that it's better to do it early. 

Paolo

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