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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Buggy IOMMU support in Coreboot on Chromebook Pixel 2 i7-5600U
On 14/08/15 08:13, fowlslegs@xxxxxxxxxx wrote: On the VT-d troubleshooting page, I was informed to shoot you all a message if Xen had to deactivate my VT-d due to errors in my BIOS (in this case Coreboot). I am running John Lewis' Coreboot ROM for the Chromebook Pixel 2 (samus) w/ the i7-5600U processor and Xen 4.4.2 on Qubes. I downloaded and cracked open (for lack of better words) John Lewis's Coreboot image (which is a modified version of the one in the Google repos) and found that src/arch/x86/acpi.c had the same section added by the http://review.coreboot.org/#/c/1654/ commit written by Patrick Georgi a few years back that is supposed to provide ACPI DMAR tables. The problem might just be the code is out of date for modern processors or maybe it has just not been tested against many CPUs.It does appear that there has been changes to this acpi.c file in the Coreboot master branch, which makes me wonder if building against that would fix my problems. Realistically though, I have barely any experience or knowledge with Coreboot hacking and I'm assuming there is a web of dependencies that I couldn't figure out without possibly months of research, trial, and error.Anyway, just wanted to send in this report as maybe you don't get too many involving Coreboot and maybe you might find it interesting or in the minute chance you might be able to help me out. Anyway, here's the output of `xl dmesg`: Please reboot and use "iommu=verbose,debug" on the Xen command line, which will offer more information. ~Andrew Xen 4.4.2-6.fc20(XEN) Xen version 4.4.2 (user@) (gcc (GCC) 4.8.3 20140911 (Red Hat 4.8.3-7)) debug=n Thu Jul 23 20:12:15 UTC 2015(XEN) Latest ChangeSet: (XEN) Bootloader: GRUB 2.00 (XEN) Command line: placeholder console=none dom0_mem=min:1024M (XEN) Video information: (XEN) VGA is text mode 80x25, font 8x16 (XEN) Disc information: (XEN) Found 2 MBR signatures (XEN) Found 2 EDD information structures (XEN) Xen-e820 RAM map: (XEN) 0000000000000000 - 000000000009fc00 (usable) (XEN) 000000000009fc00 - 00000000000a0000 (reserved) (XEN) 00000000000f0000 - 0000000000100000 (reserved) (XEN) 0000000000100000 - 000000007ce27000 (usable) (XEN) 000000007ce27000 - 0000000080000000 (reserved) (XEN) 00000000f0000000 - 00000000f4000000 (reserved) (XEN) 00000000fed10000 - 00000000fed1a000 (reserved) (XEN) 00000000fed40000 - 00000000fed45000 (reserved) (XEN) 00000000fed80000 - 00000000fed85000 (reserved) (XEN) 0000000100000000 - 000000047f000000 (usable) (XEN) ACPI: RSDP 000F2760, 0024 (r2 CORE )(XEN) ACPI: XSDT 7CF440E0, 004C (r1 CORE COREBOOT 0 CORE 0) (XEN) ACPI: FACP 7CF48970, 00F4 (r5 CORE COREBOOT 0 CORE 1) (XEN) ACPI: DSDT 7CF44250, 4720 (r2 COREv4 COREBOOT 20110725 INTL 20130117)(XEN) ACPI: FACS 7CF44210, 0040(XEN) ACPI: HPET 7CF48A70, 0038 (r1 CORE COREBOOT 0 CORE 0) (XEN) ACPI: APIC 7CF48AB0, 006C (r1 CORE COREBOOT 0 CORE 0) (XEN) ACPI: MCFG 7CF48B20, 003C (r1 CORE COREBOOT 0 CORE 0) (XEN) ACPI: SSDT 7CF49BC0, 0FF8 (r2 CORE COREBOOT 2A CORE 2A)(XEN) System RAM: 16317MB (16709400kB) (XEN) Domain heap initialised (XEN) Processor #0 7:13 APIC version 21 (XEN) Processor #1 7:13 APIC version 21 (XEN) Processor #3 7:13 APIC version 21 (XEN) Processor #2 7:13 APIC version 21 (XEN) IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-39 (XEN) Enabling APIC mode: Flat. Using 1 I/O APICs (XEN) Not enabling x2APIC: depends on iommu_supports_eim. (XEN) Using scheduler: SMP Credit Scheduler (credit) (XEN) Detected 2394.544 MHz processor. (XEN) Initing memory sharing. (XEN) xstate_init: using cntxt_size: 0x340 and states: 0x7 (XEN) I/O virtualisation disabled (XEN) Enabled directed EOI with ioapic_ack_old on! (XEN) ENABLING IO-APIC IRQs (XEN) -> Using old ACK method (XEN) Platform timer is 14.318MHz HPET (XEN) Allocated console ring of 16 KiB. (XEN) VMX: Supported advanced features: (XEN) - APIC MMIO access virtualisation (XEN) - APIC TPR shadow (XEN) - Extended Page Tables (EPT) (XEN) - Virtual-Processor Identifiers (VPID) (XEN) - Virtual NMI (XEN) - MSR direct-access bitmap (XEN) - Unrestricted Guest (XEN) HVM: ASIDs enabled. (XEN) HVM: VMX enabled (XEN) HVM: Hardware Assisted Paging (HAP) detected (XEN) HVM: HAP page sizes: 4kB, 2MB, 1GB (XEN) Brought up 4 CPUs (XEN) *** LOADING DOMAIN 0 *** (XEN) Xen kernel: 64-bit, lsb, compat32 (XEN) Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x204d000 (XEN) PHYSICAL MEMORY ARRANGEMENT:(XEN) Dom0 alloc.: 0000000468000000->0000000470000000 (4056562 pages to be allocated)(XEN) Init. ramdisk: 000000047cb6a000->000000047f000000 (XEN) VIRTUAL MEMORY ARRANGEMENT: (XEN) Loaded kernel: ffffffff81000000->ffffffff8204d000 (XEN) Init. ramdisk: 0000000000000000->0000000000000000 (XEN) Phys-Mach map: ffffffff8204d000->ffffffff83f92440 (XEN) Start info: ffffffff83f93000->ffffffff83f934b4 (XEN) Page tables: ffffffff83f94000->ffffffff83fb9000 (XEN) Boot stack: ffffffff83fb9000->ffffffff83fba000 (XEN) TOTAL: ffffffff80000000->ffffffff84400000 (XEN) ENTRY ADDRESS: ffffffff81d3f1f0 (XEN) Dom0 has maximum 4 VCPUs (XEN) Scrubbing Free RAM: .done. (XEN) Initial low memory virq threshold set at 0x4000 pages. (XEN) Std. Loglevel: Errors and warnings (XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen)(XEN) Freed 272kB init memory.(XEN) traps.c:2524:d0 Domain attempted WRMSR 00000000c0000081 from 0xe023e00800000000 to 0x0023001000000000. (XEN) traps.c:2524:d0 Domain attempted WRMSR 00000000c0000082 from 0xffff82d0802b3000 to 0xffffffff817634d0. (XEN) traps.c:2524:d0 Domain attempted WRMSR 00000000c0000083 from 0xffff82d0802b3080 to 0xffffffff817658e0. (XEN) traps.c:2524:d0 Domain attempted WRMSR 0000000000000174 from 0x000000000000e008 to 0x0000000000000010. (XEN) traps.c:2524:d0 Domain attempted WRMSR 0000000000000175 from 0xffff82d0802b7fc0 to 0x0000000000000000. (XEN) traps.c:2524:d0 Domain attempted WRMSR 0000000000000176 from 0xffff82d08021aff0 to 0xffffffff81765bf0. (XEN) traps.c:2524:d0 Domain attempted WRMSR 00000000c0000083 from 0xffff82d0802b3080 to 0xffffffff81765e30. (XEN) traps.c:2524:d0 Domain attempted WRMSR 00000000c0000084 from 0x0000000000034700 to 0x0000000000047700. (XEN) traps.c:2524:d0 Domain attempted WRMSR 00000000c0000081 from 0xe023e00800000000 to 0x0023001000000000. (XEN) traps.c:2524:d0 Domain attempted WRMSR 00000000c0000082 from 0xffff830473323000 to 0xffffffff817634d0.~*~*~*~*~*~* Noah _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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