From: Roman Kisel <romank@linux.microsoft.com>
To: Wei Liu <wei.liu@kernel.org>
Cc: ardb@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com,
decui@microsoft.com, dimitri.sivanich@hpe.com,
haiyangz@microsoft.com, hpa@zytor.com, imran.f.khan@oracle.com,
jacob.jun.pan@linux.intel.com, jgross@suse.com,
justin.ernst@hpe.com, kprateek.nayak@amd.com, kyle.meyer@hpe.com,
kys@microsoft.com, lenb@kernel.org, mingo@redhat.com,
nikunj@amd.com, papaluri@amd.com, perry.yuan@amd.com,
peterz@infradead.org, rafael@kernel.org, russ.anderson@hpe.com,
steve.wahl@hpe.com, tglx@linutronix.de, thomas.lendacky@amd.com,
tim.c.chen@linux.intel.com, tony.luck@intel.com, xin@zytor.com,
yuehaibing@huawei.com, linux-acpi@vger.kernel.org,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
x86@kernel.org, apais@microsoft.com, benhill@microsoft.com,
bperkins@microsoft.com, sunilmut@microsoft.com
Subject: Re: [PATCH hyperv-next v3] arch/x86: Provide the CPU number in the wakeup AP callback
Date: Wed, 7 May 2025 10:07:27 -0700 [thread overview]
Message-ID: <3b0c3732-ccf6-4133-b55c-4177532ebecb@linux.microsoft.com> (raw)
In-Reply-To: <aBr8cNXD630JbIxP@liuwe-devbox-ubuntu-v2.tail21d00.ts.net>
On 5/6/2025 11:23 PM, Wei Liu wrote:
> On Tue, May 06, 2025 at 02:58:34AM +0000, Wei Liu wrote:
>> On Wed, Apr 30, 2025 at 01:47:20PM -0700, Roman Kisel wrote:
>>> When starting APs, confidential guests and paravisor guests
>>> need to know the CPU number, and the pattern of using the linear
>>> search has emerged in several places. With N processors that leads
>>> to the O(N^2) time complexity.
>>>
>>> Provide the CPU number in the AP wake up callback so that one can
>>> get the CPU number in constant time.
>>>
>>> Suggested-by: Michael Kelley <mhklinux@outlook.com>
>>> Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
>>> Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
>>
>> Queued to hyperv-next. Thanks.
>
> This patch broke linux-next. I have dropped it. Please change
> numachip_wakeup_secondary.
>
Thanks for your help! Working on that.
> Wei.
--
Thank you,
Roman
prev parent reply other threads:[~2025-05-07 17:07 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-30 20:47 [PATCH hyperv-next v3] arch/x86: Provide the CPU number in the wakeup AP callback Roman Kisel
2025-04-30 22:39 ` Michael Kelley
2025-05-02 16:14 ` Thomas Gleixner
2025-05-02 17:32 ` Wei Liu
2025-05-05 17:22 ` Roman Kisel
2025-05-05 18:01 ` Wei Liu
2025-05-05 18:12 ` Dave Hansen
2025-05-06 2:52 ` Wei Liu
2025-05-06 2:57 ` Wei Liu
2025-05-06 2:58 ` Wei Liu
2025-05-07 6:22 ` [EXTERNAL] " Saurabh Singh Sengar
2025-05-07 6:23 ` Wei Liu
2025-05-07 17:07 ` Roman Kisel [this message]
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