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From: | Peter Huang(Peng) |
Subject: | [Qemu-devel] [Solved]FYI//Re: [Question] why x2apic's set by default without host support(on Nehalem CPU). |
Date: | Wed, 24 Jul 2013 10:54:57 +0800 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; rv:11.0) Gecko/20120327 Thunderbird/11.0.1 |
FYI, just for information sharing. KVM emulated x2apic feature no matter host supports it or not. You can get the code from arch/x86/kvm/cpuid.c. kvm_dev_ioctl_get_supported_cpuid ()->do_cpuid_ent() /* we support x2apic emulation even if host does not support * it since we emulate x2apic in software */ entry->ecx |= F(X2APIC); QEMU will get this feature through kvm_ioctl(). On 2013-07-24 8:48, Peter Huang(Peng) wrote: Hi,Jiri Thanks for replying. So why VM identified different features from host is due to the hypervisor filtering. I will dig into the hypervisor of how it filter features, and update status later. Thanks again. |
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