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Date: Mon, 13 Feb 2023 07:12:09 +0100
From: Juergen Gross <jgross@...e.com>
To: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"x86@...nel.org" <x86@...nel.org>,
"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Cc: "Ostrovsky, Boris" <boris.ostrovsky@...cle.com>,
"peterz@...radead.org" <peterz@...radead.org>,
"Torvalds, Linus" <torvalds@...ux-foundation.org>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"kys@...rosoft.com" <kys@...rosoft.com>,
"lists@...dbynature.de" <lists@...dbynature.de>,
"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
"hpa@...or.com" <hpa@...or.com>,
"mingo@...hat.com" <mingo@...hat.com>,
"wei.liu@...nel.org" <wei.liu@...nel.org>,
"Lutomirski, Andy" <luto@...nel.org>,
"bp@...en8.de" <bp@...en8.de>, "Cui, Dexuan" <decui@...rosoft.com>,
"mikelley@...rosoft.com" <mikelley@...rosoft.com>,
"haiyangz@...rosoft.com" <haiyangz@...rosoft.com>,
"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH v2 0/8] x86/mtrr: fix handling with PAT but without MTRR
On 11.02.23 01:06, Edgecombe, Rick P wrote:
> On Thu, 2023-02-09 at 08:22 +0100, Juergen Gross wrote:
>> This series tries to fix the rather special case of PAT being
>> available
>> without having MTRRs (either due to CONFIG_MTRR being not set, or
>> because the feature has been disabled e.g. by a hypervisor).
>
> debug_vm_pgtable fails in a KVM guest with CONFIG_MTRR=y. CONFIG_MTRR=n
> succeeds.
>
> [ 0.830280] debug_vm_pgtable: [debug_vm_pgtable ]:
> Validating architecture page table helpers
> [ 0.831906] ------------[ cut here ]------------
> [ 0.832711] WARNING: CPU: 0 PID: 1 at mm/debug_vm_pgtable.c:461
> debug_vm_pgtable+0xb9a/0xe16
> [ 0.833998] Modules linked in:
> [ 0.834450] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.2.0-rc7+
> #2366
> [ 0.835462] RIP: 0010:debug_vm_pgtable+0xb9a/0xe16
> [ 0.836217] Code: e2 3a 73 4a 48 c7 00 00 00 00 00 48 8b b4 24 a0 00
> 00 00 48 8b 54 24 60 48 8b 7c 24 20 48 c4
> [ 0.839068] RSP: 0000:ffffc90000013de0 EFLAGS: 00010246
> [ 0.839735] RAX: 0000000000000000 RBX: ffff888100048868 RCX:
> bffffffffffffff0
> [ 0.840646] RDX: 0000000000000000 RSI: 0000000040000000 RDI:
> 0000000000000000
> [ 0.841661] RBP: ffff88810004d140 R08: 0000000000000000 R09:
> ffff888100280880
> [ 0.842625] R10: 0000000000000001 R11: 0000000000000001 R12:
> ffff888103810298
> [ 0.843574] R13: ffff888100048780 R14: ffffffff8282e099 R15:
> 0000000000000000
> [ 0.844524] FS: 0000000000000000(0000) GS:ffff88813bc00000(0000)
> knlGS:0000000000000000
> [ 0.845706] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 0.846499] CR2: ffff88813ffff000 CR3: 000000000222d001 CR4:
> 0000000000370ef0
> [ 0.847464] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [ 0.848432] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> [ 0.849371] Call Trace:
> [ 0.849699] <TASK>
> [ 0.849997] ? destroy_args+0x131/0x131
> [ 0.850487] do_one_initcall+0x61/0x250
> [ 0.850983] ? rdinit_setup+0x2c/0x2c
> [ 0.851451] kernel_init_freeable+0x18e/0x1d8
> [ 0.852033] ? rest_init+0x130/0x130
> [ 0.852533] kernel_init+0x16/0x120
> [ 0.853035] ret_from_fork+0x1f/0x30
> [ 0.853507] </TASK>
> [ 0.853803] ---[ end trace 0000000000000000 ]---
> [ 0.854421] ------------[ cut here ]------------
> [ 0.855027] WARNING: CPU: 0 PID: 1 at mm/debug_vm_pgtable.c:462
> debug_vm_pgtable+0xbaa/0xe16
> [ 0.856115] Modules linked in:
> [ 0.856517] CPU: 0 PID: 1 Comm: swapper/0 Tainted:
> G W 6.2.0-rc7+ #2366
> [ 0.857562] RIP: 0010:debug_vm_pgtable+0xbaa/0xe16
> [ 0.858186] Code: 00 00 00 48 8b 54 24 60 48 8b 7c 24 20 48 c1 e6 0c
> e8 79 18 7f fe 85 c0 75 02 0f 0b 48 8b 7b
> [ 0.860778] RSP: 0000:ffffc90000013de0 EFLAGS: 00010246
> [ 0.861519] RAX: 0000000000000000 RBX: ffff888100048868 RCX:
> bffffffffffffff0
> [ 0.862530] RDX: 0000000000000000 RSI: 0000000040000000 RDI:
> ffff88810380e7f8
> [ 0.863522] RBP: ffff88810004d140 R08: 0000000000000000 R09:
> ffff888100280880
> [ 0.864449] R10: 0000000000000001 R11: 0000000000000001 R12:
> ffff888103810298
> [ 0.865454] R13: ffff888100048780 R14: ffffffff8282e099 R15:
> 0000000000000000
> [ 0.866401] FS: 0000000000000000(0000) GS:ffff88813bc00000(0000)
> knlGS:0000000000000000
> [ 0.867438] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 0.868181] CR2: ffff88813ffff000 CR3: 000000000222d001 CR4:
> 0000000000370ef0
> [ 0.869097] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [ 0.870026] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> [ 0.870943] Call Trace:
> [ 0.871259] <TASK>
> [ 0.871537] ? destroy_args+0x131/0x131
> [ 0.872030] do_one_initcall+0x61/0x250
> [ 0.872521] ? rdinit_setup+0x2c/0x2c
> [ 0.873005] kernel_init_freeable+0x18e/0x1d8
> [ 0.873607] ? rest_init+0x130/0x130
> [ 0.874116] kernel_init+0x16/0x120
> [ 0.874618] ret_from_fork+0x1f/0x30
> [ 0.875123] </TASK>
> [ 0.875411] ---[ end trace 0000000000000000 ]---
Thanks for the report.
I'll have a look. Probably I'll need to re-add the check for WB in patch 7.
Juergen
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