From:   "Nakajima, Jun" <jun.nakajima@intel.com>
To:     "Hansen, Dave" <dave.hansen@intel.com>
CC:     Paolo Bonzini <pbonzini@redhat.com>,
        "Zhong, Yang" <yang.zhong@intel.com>,
        "x86@kernel.org" <x86@kernel.org>,
        "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "mingo@redhat.com" <mingo@redhat.com>,
        "bp@alien8.de" <bp@alien8.de>,
        "dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
        "Christopherson,, Sean" <seanjc@google.com>,
        "Tian, Kevin" <kevin.tian@intel.com>,
        "jing2.liu@linux.intel.com" <jing2.liu@linux.intel.com>,
        "Liu, Jing2" <jing2.liu@intel.com>
Subject: Re: State Component 18 and Palette 1 (Re: [PATCH 16/19] kvm: x86:
 Introduce KVM_{G|S}ET_XSAVE2 ioctl)
Thread-Topic: State Component 18 and Palette 1 (Re: [PATCH 16/19] kvm: x86:
 Introduce KVM_{G|S}ET_XSAVE2 ioctl)
Thread-Index: AQHX9cqX7SWtWES7r0ekmxWWLzZDHKw+m16AgACWsQA=
Date:   Wed, 22 Dec 2021 23:51:22 +0000
Message-ID: <5204C914-9C5E-4273-857A-198A955DE2D2@intel.com>
References: <20211208000359.2853257-1-yang.zhong@intel.com>
 <20211208000359.2853257-17-yang.zhong@intel.com>
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> On Dec 22, 2021, at 6:52 AM, Hansen, Dave <dave.hansen@intel.com> wrote:
>=20
> On 12/20/21 9:54 AM, Nakajima, Jun wrote:
>>> So, I hope that save state 18 will be frozen to 8k.  In that case,
>>> and if palette 1 is frozen to the same values as today,
>>> implementing migration will not be a problem; it will be
>>> essentially the same as SSE->AVX (horizontal extension of existing
>>> registers) and/or AVX->AVX512 (both horizontal and vertical
>>> extension).
>>=20
>> I would like to confirm that the state component 18 will remain 8KB
>> and palette 1 will remain the same.
>=20
> Is that an architectural statement that will soon be making its way into
> the SDM?

Yes, with the other clarifications (e.g. setting IA32_XFD[18]).

Thanks,
---=20
Jun