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Re: [Qemu-devel] [PATCH v3] i386: Add some MSR based features on Cascade
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From: |
Eduardo Habkost |
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Subject: |
Re: [Qemu-devel] [PATCH v3] i386: Add some MSR based features on Cascadelake-Server CPU model |
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Date: |
Wed, 8 May 2019 17:01:08 -0300 |
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User-agent: |
Mutt/1.10.1 (2018-07-13) |
On Wed, May 08, 2019 at 09:31:53AM +0800, Tao Xu wrote:
> As noted in "c7a88b52f6 i386: Add new model of Cascadelake-Server"
> Because MSR based feature has been supported by QEMU, we add
> CPUID_7_0_EDX_ARCH_CAPABILITIES on Cascadelake-Server CPU model,
> and add IA32_ARCH_CAPABILITIES MSR based features (RDCL_NO,
> IBRS_ALL and SKIP_L1DFL_VMENTRY).
>
> And "014018e19b i386: Make arch_capabilities migratable" has been
> in QEMU upstream, the CPUID_7_0_EDX_ARCH_CAPABILITIES can be
> safely added into CPU Model.
>
> Signed-off-by: Tao Xu <address@hidden>
CPUID_7_0_EDX_ARCH_CAPABILITIES requires Linux >= v4.16. This
means the patch will make "-cpu Cascadelake-Server" stop working
on Linux < v4.16 hosts, doesn't it?
For additional details, see:
https://www.mail-archive.com/address@hidden/msg603291.html
"[PATCH 2/2] i386: Add some MSR based features on
Cascadelake-Server CPU model"
and:
https://www.mail-archive.com/address@hidden/msg606373.html
"Cascadelake-Server missing MSR based features ?"
--
Eduardo