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From:   Dexuan Cui <decui@microsoft.com>
To:     "tglx@linutronix.de" <tglx@linutronix.de>,
        "dwmw2@infradead.org" <dwmw2@infradead.org>,
        "x86@kernel.org" <x86@kernel.org>,
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        "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>
CC:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Tianyu Lan <Tianyu.Lan@microsoft.com>,
        vkuznets <vkuznets@redhat.com>,
        KY Srinivasan <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        "wei.liu@kernel.org" <wei.liu@kernel.org>,
        "mingo@redhat.com" <mingo@redhat.com>,
        "bp@alien8.de" <bp@alien8.de>, "hpa@zytor.com" <hpa@zytor.com>
Subject: RE: [PATCH] x86/hyperv: Enable 15-bit APIC ID if the hypervisor
 supports it
Thread-Topic: [PATCH] x86/hyperv: Enable 15-bit APIC ID if the hypervisor
 supports it
Thread-Index: AQHWsX5b4+ft06KSG0GlKPe1Plvd8Km2JGLQ
Date:   Tue, 3 Nov 2020 09:37:06 +0000
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References: <20201103011136.59108-1-decui@microsoft.com>
In-Reply-To: <20201103011136.59108-1-decui@microsoft.com>
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> From: Dexuan Cui <decui@microsoft.com>
> Sent: Monday, November 2, 2020 5:12 PM
>=20
> ...

Hi tglx,
Now this patch is in the x86/apic branch, which is great! Thanks for the=20
quick action! But the third line of the below paragraph of the commit log
is missing... Sorry I just realized I should have not prefixed that line wi=
th the
">255 APIC IDs" -- it looks a line is ignored if it starts with 2 chars of =
">>". :-(

> On an old Hyper-V host that doesn't support the Extended Dest ID, nothing
> changes with this commit: Linux VM is still able to bring up the CPUs wit=
h
> >255 APIC IDs with the help of hyperv-iommu.c, but IOAPIC interrupts stil=
l
> can not go to such CPUs, and the kdump kernel still can not work properly
> on such CPUs.