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Re: [PATCH v2 0/8] x86/mtrr: fix handling with PAT but without MTRR

To: "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "Gross, Jurgen" <jgross@xxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "linux-hyperv@xxxxxxxxxxxxxxx" <linux-hyperv@xxxxxxxxxxxxxxx>

From: "Edgecombe, Rick P" <rick.p.edgecombe@xxxxxxxxx>

Date: Sat, 11 Feb 2023 00:06:11 +0000

Accept-language: en-US

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Delivery-date: Sat, 11 Feb 2023 05:20:57 +0000

List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Thread-index: AQHZPaym1OeQ0uPDs0uotDA3o+cSyA==

Thread-topic: [PATCH v2 0/8] x86/mtrr: fix handling with PAT but without MTRR

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 ]---

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