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Re: [Qemu-devel] [PATCH v2 2/5] i386: Add CPUID bit and feature words fo
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH v2 2/5] i386: Add CPUID bit and feature words for IA32_ARCH_CAPABILITIES MSR |
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Date: |
Thu, 12 Jul 2018 17:47:57 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 |
On 12/07/2018 11:18, Robert Hoo wrote:
>>> And you'd like to set IA32_ARCH_CAPABILITIES.RSBA by default in qemu or
>>> kvm layer?
>> Probably we need to make this decision in QEMU. If KVM set RSBA
>> automatically on .get_msr_feature(), QEMU won't be able to
>> differentiate a host with RSBA set from a host with RSBA unset.
>>
> What's the default value for MSR IA32_ARCH_CAPABILITIES? is it clear
> now?
>
It's the host value. However, QEMU never sets the CPUID bit so it
doesn't matter if you are using QEMU.
Paolo