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Mon, 08 Jul 2024 01:32:44 -0700 (PDT) Message-ID: Date: Mon, 8 Jul 2024 09:32:42 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Problems in PV dom0 on recent x86 hardware To: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= , "xen-devel@lists.xenproject.org" References: Content-Language: en-GB From: Andrew Cooper Autocrypt: addr=andrew.cooper3@citrix.com; keydata= xsFNBFLhNn8BEADVhE+Hb8i0GV6mihnnr/uiQQdPF8kUoFzCOPXkf7jQ5sLYeJa0cQi6Penp VtiFYznTairnVsN5J+ujSTIb+OlMSJUWV4opS7WVNnxHbFTPYZVQ3erv7NKc2iVizCRZ2Kxn srM1oPXWRic8BIAdYOKOloF2300SL/bIpeD+x7h3w9B/qez7nOin5NzkxgFoaUeIal12pXSR Q354FKFoy6Vh96gc4VRqte3jw8mPuJQpfws+Pb+swvSf/i1q1+1I4jsRQQh2m6OTADHIqg2E ofTYAEh7R5HfPx0EXoEDMdRjOeKn8+vvkAwhviWXTHlG3R1QkbE5M/oywnZ83udJmi+lxjJ5 YhQ5IzomvJ16H0Bq+TLyVLO/VRksp1VR9HxCzItLNCS8PdpYYz5TC204ViycobYU65WMpzWe LFAGn8jSS25XIpqv0Y9k87dLbctKKA14Ifw2kq5OIVu2FuX+3i446JOa2vpCI9GcjCzi3oHV e00bzYiHMIl0FICrNJU0Kjho8pdo0m2uxkn6SYEpogAy9pnatUlO+erL4LqFUO7GXSdBRbw5 gNt25XTLdSFuZtMxkY3tq8MFss5QnjhehCVPEpE6y9ZjI4XB8ad1G4oBHVGK5LMsvg22PfMJ ISWFSHoF/B5+lHkCKWkFxZ0gZn33ju5n6/FOdEx4B8cMJt+cWwARAQABzSlBbmRyZXcgQ29v cGVyIDxhbmRyZXcuY29vcGVyM0BjaXRyaXguY29tPsLBegQTAQgAJAIbAwULCQgHAwUVCgkI CwUWAgMBAAIeAQIXgAUCWKD95wIZAQAKCRBlw/kGpdefoHbdD/9AIoR3k6fKl+RFiFpyAhvO 59ttDFI7nIAnlYngev2XUR3acFElJATHSDO0ju+hqWqAb8kVijXLops0gOfqt3VPZq9cuHlh IMDquatGLzAadfFx2eQYIYT+FYuMoPZy/aTUazmJIDVxP7L383grjIkn+7tAv+qeDfE+txL4 SAm1UHNvmdfgL2/lcmL3xRh7sub3nJilM93RWX1Pe5LBSDXO45uzCGEdst6uSlzYR/MEr+5Z JQQ32JV64zwvf/aKaagSQSQMYNX9JFgfZ3TKWC1KJQbX5ssoX/5hNLqxMcZV3TN7kU8I3kjK mPec9+1nECOjjJSO/h4P0sBZyIUGfguwzhEeGf4sMCuSEM4xjCnwiBwftR17sr0spYcOpqET ZGcAmyYcNjy6CYadNCnfR40vhhWuCfNCBzWnUW0lFoo12wb0YnzoOLjvfD6OL3JjIUJNOmJy RCsJ5IA/Iz33RhSVRmROu+TztwuThClw63g7+hoyewv7BemKyuU6FTVhjjW+XUWmS/FzknSi dAG+insr0746cTPpSkGl3KAXeWDGJzve7/SBBfyznWCMGaf8E2P1oOdIZRxHgWj0zNr1+ooF /PzgLPiCI4OMUttTlEKChgbUTQ+5o0P080JojqfXwbPAyumbaYcQNiH1/xYbJdOFSiBv9rpt TQTBLzDKXok86M7BTQRS4TZ/ARAAkgqudHsp+hd82UVkvgnlqZjzz2vyrYfz7bkPtXaGb9H4 Rfo7mQsEQavEBdWWjbga6eMnDqtu+FC+qeTGYebToxEyp2lKDSoAsvt8w82tIlP/EbmRbDVn 7bhjBlfRcFjVYw8uVDPptT0TV47vpoCVkTwcyb6OltJrvg/QzV9f07DJswuda1JH3/qvYu0p vjPnYvCq4NsqY2XSdAJ02HrdYPFtNyPEntu1n1KK+gJrstjtw7KsZ4ygXYrsm/oCBiVW/OgU g/XIlGErkrxe4vQvJyVwg6YH653YTX5hLLUEL1NS4TCo47RP+wi6y+TnuAL36UtK/uFyEuPy wwrDVcC4cIFhYSfsO0BumEI65yu7a8aHbGfq2lW251UcoU48Z27ZUUZd2Dr6O/n8poQHbaTd 6bJJSjzGGHZVbRP9UQ3lkmkmc0+XCHmj5WhwNNYjgbbmML7y0fsJT5RgvefAIFfHBg7fTY/i kBEimoUsTEQz+N4hbKwo1hULfVxDJStE4sbPhjbsPCrlXf6W9CxSyQ0qmZ2bXsLQYRj2xqd1 bpA+1o1j2N4/au1R/uSiUFjewJdT/LX1EklKDcQwpk06Af/N7VZtSfEJeRV04unbsKVXWZAk uAJyDDKN99ziC0Wz5kcPyVD1HNf8bgaqGDzrv3TfYjwqayRFcMf7xJaL9xXedMcAEQEAAcLB XwQYAQgACQUCUuE2fwIbDAAKCRBlw/kGpdefoG4XEACD1Qf/er8EA7g23HMxYWd3FXHThrVQ HgiGdk5Yh632vjOm9L4sd/GCEACVQKjsu98e8o3ysitFlznEns5EAAXEbITrgKWXDDUWGYxd pnjj2u+GkVdsOAGk0kxczX6s+VRBhpbBI2PWnOsRJgU2n10PZ3mZD4Xu9kU2IXYmuW+e5KCA vTArRUdCrAtIa1k01sPipPPw6dfxx2e5asy21YOytzxuWFfJTGnVxZZSCyLUO83sh6OZhJkk b9rxL9wPmpN/t2IPaEKoAc0FTQZS36wAMOXkBh24PQ9gaLJvfPKpNzGD8XWR5HHF0NLIJhgg 4ZlEXQ2fVp3XrtocHqhu4UZR4koCijgB8sB7Tb0GCpwK+C4UePdFLfhKyRdSXuvY3AHJd4CP 4JzW0Bzq/WXY3XMOzUTYApGQpnUpdOmuQSfpV9MQO+/jo7r6yPbxT7CwRS5dcQPzUiuHLK9i nvjREdh84qycnx0/6dDroYhp0DFv4udxuAvt1h4wGwTPRQZerSm4xaYegEFusyhbZrI0U9tJ B8WrhBLXDiYlyJT6zOV2yZFuW47VrLsjYnHwn27hmxTC/7tvG3euCklmkn9Sl9IAKFu29RSo d5bD8kMSCYsTqtTfT6W4A3qHGvIDta3ptLYpIAOD2sY3GYq2nf3Bbzx81wZK14JdDDHUX2Rs 6+ahAA== In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 08/07/2024 9:15 am, Jürgen Groß wrote: > I've got an internal report about failures in dom0 when booting with > Xen on a Thinkpad P14s Gen 3 AMD (kernel 6.9). > > With some debugging I've found that the UCSI driver seems to fail to > map MFN feec2 as iomem, as the hypervisor is denying this mapping due > to being part of the MSI space. The mapping attempt seems to be the > result of an ACPI call of the UCSI driver: > > [   44.575345] RIP: e030:xen_mc_flush+0x1e8/0x2b0 > [   44.575418]  xen_leave_lazy_mmu+0x15/0x60 > [   44.575425]  vmap_range_noflush+0x408/0x6f0 > [   44.575438]  __ioremap_caller+0x20d/0x350 > [   44.575450]  acpi_os_map_iomem+0x1a3/0x1c0 > [   44.575454]  acpi_ex_system_memory_space_handler+0x229/0x3f0 > [   44.575464]  acpi_ev_address_space_dispatch+0x17e/0x4c0 > [   44.575474]  acpi_ex_access_region+0x28a/0x510 > [   44.575479]  acpi_ex_field_datum_io+0x95/0x5c0 > [   44.575482]  acpi_ex_extract_from_field+0x36b/0x4e0 > [   44.575490]  acpi_ex_read_data_from_field+0xcb/0x430 > [   44.575493]  acpi_ex_resolve_node_to_value+0x2e0/0x530 > [   44.575496]  acpi_ex_resolve_to_value+0x1e7/0x550 > [   44.575499]  acpi_ds_evaluate_name_path+0x107/0x170 > [   44.575505]  acpi_ds_exec_end_op+0x392/0x860 > [   44.575508]  acpi_ps_parse_loop+0x268/0xa30 > [   44.575515]  acpi_ps_parse_aml+0x221/0x5e0 > [   44.575518]  acpi_ps_execute_method+0x171/0x3e0 > [   44.575522]  acpi_ns_evaluate+0x174/0x5d0 > [   44.575525]  acpi_evaluate_object+0x167/0x440 > [   44.575529]  acpi_evaluate_dsm+0xb6/0x130 > [   44.575541]  ucsi_acpi_dsm+0x53/0x80 > [   44.575546]  ucsi_acpi_read+0x2e/0x60 > [   44.575550]  ucsi_register+0x24/0xa0 > [   44.575555]  ucsi_acpi_probe+0x162/0x1e3 > [   44.575559]  platform_probe+0x48/0x90 > [   44.575567]  really_probe+0xde/0x340 > [   44.575579]  __driver_probe_device+0x78/0x110 > [   44.575581]  driver_probe_device+0x1f/0x90 > [   44.575584]  __driver_attach+0xd2/0x1c0 > [   44.575587]  bus_for_each_dev+0x77/0xc0 > [   44.575590]  bus_add_driver+0x112/0x1f0 > [   44.575593]  driver_register+0x72/0xd0 > [   44.575600]  do_one_initcall+0x48/0x300 > [   44.575607]  do_init_module+0x60/0x220 > [   44.575615]  __do_sys_init_module+0x17f/0x1b0 > [   44.575623]  do_syscall_64+0x82/0x170 > [   44.575685] 1 of 1 multicall(s) failed: cpu 4 > [   44.575695]   call  1: op=1 result=-1 > caller=xen_extend_mmu_update+0x4e/0xd0 pars=ffff888267e25ad0 1 0 7ff0 > args=9ba37a678 80000000feec2073 > > The pte value of the mmu_update call is 80000000feec2073, which is > rejected by > the hypervisor with -EPERM. > > Before diving deep into the UCSI internals, is it possible that the > hypervisor > needs some update (IOW: could it be the mapping attempt should rather be > honored, as there might be an I/O resources at this position which > dom0 needs > to access for using the related hardware?) > It's only MSI space for external accesses.  For CPU accesses its other things, notably the LAPIC MMIO window. Do we know what this range is supposed to be for?  I do find it surprising for a USB BAR to be here. ~Andrew