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Message-ID: <277289d3-7d95-41b9-a8ce-bcddac353883@amd.com>
Date: Wed, 26 Mar 2025 19:47:05 +0530
From: "Aithal, Srikanth" <sraithal@....com>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Linux-Next Mailing List <linux-next@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
"Lendacky, Thomas" <Thomas.Lendacky@....com>,
"Roth, Michael" <Michael.Roth@....com>
Subject: Re: linux-next regression: SNP Guest boot hangs with certain cpu/mem
config combination
On 3/25/2025 7:03 PM, Kirill A. Shutemov wrote:
> On Tue, Mar 25, 2025 at 02:40:00PM +0530, Aithal, Srikanth wrote:
>> Hello,
>>
>>
>> Starting linux-next build next-20250312, including recent build 20250324, we
>> are seeing an issue where the SNP guest boot hangs at the "boot smp config"
>> step:
>>
>>
>> [ 2.294722] smp: Bringing up secondary CPUs ...
>> [ 2.295211] smpboot: Parallel CPU startup disabled by the platform
>> [ 2.309687] smpboot: x86: Booting SMP configuration:
>> [ 2.310214] .... node #0, CPUs: #1 #2 #3 #4 #5 #6
>> #7 #8 #9 #10 #11 #12 #13 #14 #15 #16 #17 #18 #19 #20 #21
>> #22 #23 #24 #25 #26 #27 #28 #29 #30 #31 #32 #33 #34 #35 #36
>> #37 #38 #39 #40 #41 #42 #43 #44 #45 #46 #47 #48 #49 #50 #51
>> #52 #53 #54 #55 #56 #57 #58 #59 #60 #61 #62 #63 #64 #65 #66
>> #67 #68 #69 #70 #71 #72 #73 #74 #75 #76 #77 #78 #79 #80 #81
>> #82 #83 #84 #85 #86 #87 #88 #89 #90 #91 #92 #93 #94 #95 #96
>> #97 #98 #99 #100 #101 #102 #103 #104 #105 #106 #107 #108 #109 #110 #111
>> #112 #113 #114 #115 #116 #117 #118 #119 #120 #121 #122 #123 #124 #125 #126
>> #127 #128 #129 #130 #131 #132 #133 #134 #135 #136 #137 #138 #139 #140 #141
>> #142 #143 #144 #145 #146 #147 #148 #149 #150 #151 #152 #153 #154 #155 #156
>> #157 #158 #159 #160 #161 #162 #163 #164 #165 #166 #167 #168 #169 #170 #171
>> #172 #173 #174 #175 #176 #177 #178 #179 #180 #181 #182 #183 #184 #185 #186
>> #187 #188 #189 #190 #191 #192 #193 #194 #195 #196 #197 #198
>> --> The guest hangs forever at this point.
>>
>>
>> I have observed that certain vCPU and memory combinations work, while others
>> do not. The VM configuration I am using does not have any NUMA nodes.
>>
>> vcpus Mem SNP guest boot
>> <=240 19456M Boots fine
>>> =241,<255 19456M Hangs
>> 1-255 2048M Boots fine
>> 1-255 4096M Boots fine
>>> 71 8192M Hangs
>>> 41 6144M Hangs
>>
>> When I bisected this issue, it pointed to the following commit :
>>
>>
>> *commit 800f1059c99e2b39899bdc67a7593a7bea6375d8*
>> Author: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
>> Date: Mon Mar 10 10:28:55 2025 +0200
>>
>> mm/page_alloc: fix memory accept before watermarks gets initialized
>
> Hm. It is puzzling for me. I don't see how this commit can cause the hang.
>
> Could you track down where hang happens?
I am attaching the full guest serial log when this issue is hit. As
mentioned earlier guest boot hangs at smp config step.
>
View attachment "kvm_guest_serial.log" of type "text/plain" (164052 bytes)
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