Re: [Xen-devel] [BUG] After upgrade to Xen 4.12.0 iommu=no-igfx

[Roman Shaposhnik <roman@zededa.com>]

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On Tue, Jul 23, 2019 at 10:50 AM Andrew Cooper
<andrew.cooper3@citrix.com> wrote:
>
> On 23/07/2019 18:48, Roman Shaposhnik wrote:
> > On Tue, Jul 23, 2019 at 10:35 AM Andrew Cooper
> > <andrew.cooper3@citrix.com> wrote:
> >> On 23/07/2019 18:32, Roman Shaposhnik wrote:
> >>> Hi Roger!
> >>>
> >>> I applied your patch, removed no-igfx and I still see the original
> >>> problem. Please let me know what other logs/debugs would you need at
> >>> this point.
> >> Please can you collect a full boot log with iommu=debug
> > How long of an output should I expect when iommu=debug is enabled?
> > I've just enabled it and I'm looking at what appears to be an endless
> > scroll of debug info.
> >
> > This is all I see for the good 5 minutes at this point. Culminating with:
> > (XEN)   (XEN) APIC error on CPU0: 40(00)
> >
> > and a failure to boot.
> >
> > Note that this is still without no-igfx
> >
> > I'm attaching the tail end of this log.
>
> Sadly, what is useful is the head of the log, before it starts
> complaining loudly about every DMA fault.

No worries. Take a look at the head of the log attached.

Btw, I'm kind of curious why iommu=debug would actually make it crash

Thanks,
Roman.

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0x0000:0x00:0x02.0x0: ROM: 0x10000 bytes at 0x8968d018
0x0000:0x02:0x00.0x0: ROM: 0x10000 bytes at 0x89640018
0x0000:0x00:0x1f.0x6: ROM: 0x10c00 bytes at 0x8962f018
 Xen 4.12.0
(XEN) Xen version 4.12.0 (@) (gcc (Alpine 6.4.0) 6.4.0) debug=n  Tue Jul 23 17:15:48 UTC 2019
(XEN) Latest ChangeSet:
(XEN) Bootloader: GRUB 2.03
(XEN) Command line: com1=115200,8n1 console=com1,vga iommu=debug dom0_mem=1024M,max:1024M dom0_max_vcpus=1 dom0_vcpus_pin smt=false
(XEN) Xen image load base address: 0x88000000
(XEN) Video information:
(XEN)  VGA is graphics mode 1680x1050, 32 bpp
(XEN) Disc information:
(XEN)  Found 0 MBR signatures
(XEN)  Found 1 EDD information structures
(XEN) EFI RAM map:
(XEN)  0000000000000000 - 0000000000058000 (usable)
(XEN)  0000000000058000 - 0000000000059000 (reserved)
(XEN)  0000000000059000 - 000000000009f000 (usable)
(XEN)  000000000009f000 - 00000000000a0000 (reserved)
(XEN)  0000000000100000 - 000000008648a000 (usable)
(XEN)  000000008648a000 - 000000008648b000 (ACPI NVS)
(XEN)  000000008648b000 - 00000000864b5000 (reserved)
(XEN)  00000000864b5000 - 000000008c224000 (usable)
(XEN)  000000008c224000 - 000000008c528000 (reserved)
(XEN)  000000008c528000 - 000000008c736000 (usable)
(XEN)  000000008c736000 - 000000008cea7000 (ACPI NVS)
(XEN)  000000008cea7000 - 000000008d2ff000 (reserved)
(XEN)  000000008d2ff000 - 000000008d300000 (usable)
(XEN)  000000008d300000 - 000000008d400000 (reserved)
(XEN)  00000000e0000000 - 00000000f0000000 (reserved)
(XEN)  00000000fe000000 - 00000000fe011000 (reserved)
(XEN)  00000000fec00000 - 00000000fec01000 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000ff000000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 000000016e000000 (usable)
(XEN) ACPI: RSDP 8CE49000, 0024 (r2 ALASKA)
(XEN) ACPI: XSDT 8CE490A8, 00CC (r1 ALASKA   A M I   1072009 AMI     10013)
(XEN) ACPI: FACP 8CE6C370, 010C (r5 ALASKA   A M I   1072009 AMI     10013)
(XEN) ACPI: DSDT 8CE49208, 23167 (r2 ALASKA   A M I   1072009 INTL 20120913)
(XEN) ACPI: FACS 8CE8EF80, 0040
(XEN) ACPI: APIC 8CE6C480, 0084 (r3 ALASKA   A M I   1072009 AMI     10013)
(XEN) ACPI: FPDT 8CE6C508, 0044 (r1 ALASKA   A M I   1072009 AMI     10013)
(XEN) ACPI: FIDT 8CE6C550, 009C (r1 ALASKA   A M I   1072009 AMI     10013)
(XEN) ACPI: MCFG 8CE6C5F0, 003C (r1 ALASKA   A M I   1072009 MSFT       97)
(XEN) ACPI: HPET 8CE6C630, 0038 (r1 ALASKA   A M I   1072009 AMI.    5000B)
(XEN) ACPI: LPIT 8CE6C668, 0094 (r1 INTEL   SKL-ULT        0 MSFT       5F)
(XEN) ACPI: SSDT 8CE6C700, 0248 (r2 INTEL  sensrhub        0 INTL 20120913)
(XEN) ACPI: SSDT 8CE6C948, 2BAE (r2 INTEL  PtidDevc     1000 INTL 20120913)
(XEN) ACPI: SSDT 8CE6F4F8, 0BE3 (r2 INTEL  Ther_Rvp     1000 INTL 20120913)
(XEN) ACPI: SSDT 8CE700E0, 04A3 (r2 INTEL     zpodd     1000 INTL 20120913)
(XEN) ACPI: DBGP 8CE70588, 0034 (r1 INTEL                  0 MSFT       5F)
(XEN) ACPI: DBG2 8CE705C0, 0054 (r0 INTEL                  0 MSFT       5F)
(XEN) ACPI: SSDT 8CE70618, 06E9 (r2  INTEL xh_rvp07        0 INTL 20120913)
(XEN) ACPI: SSDT 8CE70D08, 547E (r2 SaSsdt  SaSsdt      3000 INTL 20120913)
(XEN) ACPI: UEFI 8CE76188, 0042 (r1                        0             0)
(XEN) ACPI: SSDT 8CE761D0, 0E73 (r2 CpuRef  CpuSsdt     3000 INTL 20120913)
(XEN) ACPI: BGRT 8CE77048, 0038 (r1 ALASKA   A M I   1072009 AMI     10013)
(XEN) ACPI: DMAR 8CE77080, 00A8 (r1 INTEL      SKL         1 INTL        1)
(XEN) ACPI: TPM2 8CE77128, 0034 (r3        Tpm2Tabl        1 AMI         0)
(XEN) ACPI: ASF! 8CE77160, 00A5 (r32 INTEL       HCG        1 TFSM    F4240)
(XEN) System RAM: 4003MB (4099736kB)
(XEN) Domain heap initialised
(XEN) ACPI: 32/64X FACS address mismatch in FADT - 8ce8ef80/0000000000000000, using 32
(XEN) IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-119
(XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
(XEN) [VT-D]Host address width 39
(XEN) [VT-D]found ACPI_DMAR_DRHD:
(XEN) [VT-D]  dmaru->address = fed90000
(XEN) [VT-D]drhd->address = fed90000 iommu->reg = ffff82c0008de000
(XEN) [VT-D]cap = 1c0000c40660462 ecap = 7e3ff0505e
(XEN) [VT-D] endpoint: 0000:00:02.0
(XEN) [VT-D]found ACPI_DMAR_DRHD:
(XEN) [VT-D]  dmaru->address = fed91000
(XEN) [VT-D]drhd->address = fed91000 iommu->reg = ffff82c0008e0000
(XEN) [VT-D]cap = d2008c40660462 ecap = f050da
(XEN) [VT-D] IOAPIC: 0000:f0:1f.0
(XEN) [VT-D] MSI HPET: 0000:00:1f.0
(XEN) [VT-D]  flags: INCLUDE_ALL
(XEN) [VT-D]found ACPI_DMAR_RMRR:
(XEN) [VT-D] endpoint: 0000:00:14.0
(XEN) [VT-D]found ACPI_DMAR_RMRR:
(XEN) [VT-D]  RMRR address range 8d800000..8fffffff not in reserved memory; need "iommu_inclusive_mapping=1"?
(XEN) [VT-D] endpoint: 0000:00:02.0
(XEN) Switched to APIC driver x2apic_cluster.
(XEN) xstate: size: 0x440 and states: 0x1f
(XEN) Speculative mitigation facilities:
(XEN)   Hardware features:
(XEN)   Compiled-in support: SHADOW_PAGING
(XEN)   Xen settings: BTI-Thunk N/A, SPEC_CTRL: No, Other:
(XEN)   L1TF: believed vulnerable, maxphysaddr L1D 46, CPUID 39, Safe address 8000000000
(XEN)   Support for HVM VMs: RSB EAGER_FPU
(XEN)   Support for PV VMs: RSB EAGER_FPU
(XEN)   XPTI (64-bit PV only): Dom0 enabled, DomU enabled (with PCID)
(XEN)   PV L1TF shadowing: Dom0 disabled, DomU enabled
(XEN) Using scheduler: SMP Credit Scheduler rev2 (credit2)
(XEN) Initializing Credit2 scheduler
(XEN) Platform timer is 23.999MHz HPET
(XEN) Detected 2496.140 MHz processor.
(XEN) Initing memory sharing.
(XEN) Intel VT-d iommu 0 supported page sizes: 4kB, 2MB, 1GB.
(XEN) Intel VT-d iommu 1 supported page sizes: 4kB, 2MB, 1GB.
(XEN) Intel VT-d Snoop Control not enabled.
(XEN) Intel VT-d Dom0 DMA Passthrough not enabled.
(XEN) Intel VT-d Queued Invalidation enabled.
(XEN) Intel VT-d Interrupt Remapping enabled.
(XEN) Intel VT-d Posted Interrupt not enabled.
(XEN) Intel VT-d Shared EPT tables enabled.
(XEN) I/O virtualisation enabled
(XEN)  - Dom0 mode: Relaxed
(XEN) Interrupt remapping enabled
(XEN) Enabled directed EOI with ioapic_ack_old on!
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using old ACK method
(XEN) TSC_DEADLINE disabled due to Errata; please update microcode to version 0xb2 (or later)
(XEN) Allocated console ring of 16 KiB.
(XEN) mwait-idle: max C-state count of 8 reached
(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)  - VMCS shadowing
(XEN)  - VM Functions
(XEN)  - Virtualisation Exceptions
(XEN)  - Page Modification Logging
(XEN) HVM: ASIDs enabled.
(XEN) HVM: VMX enabled
(XEN) HVM: Hardware Assisted Paging (HAP) detected
(XEN) HVM: HAP page sizes: 4kB, 2MB, 1GB
(XEN) mwait-idle: max C-state count of 8 reached
(XEN) mwait-idle: max C-state count of 8 reached
(XEN) mwait-idle: max C-state count of 8 reached
(XEN) Brought up 2 CPUs
(XEN) Dom0 has maximum 312 PIRQs
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x2a2c000
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   0000000164000000->0000000168000000 (245760 pages to be allocated)
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: ffffffff81000000->ffffffff82a2c000
(XEN)  Init. ramdisk: 0000000000000000->0000000000000000
(XEN)  Phys-Mach map: 0000008000000000->0000008000200000
(XEN)  Start info:    ffffffff82a2c000->ffffffff82a2c4b4
(XEN)  Xenstore ring: 0000000000000000->0000000000000000
(XEN)  Console ring:  0000000000000000->0000000000000000
(XEN)  Page tables:   ffffffff82a2d000->ffffffff82a46000
(XEN)  Boot stack:    ffffffff82a46000->ffffffff82a47000
(XEN)  TOTAL:         ffffffff80000000->ffffffff82c00000
(XEN)  ENTRY ADDRESS: ffffffff826af180
(XEN) Dom0 has maximum 1 VCPUs
(XEN) [VT-D]d0:Hostbridge: skip 0000:00:00.0 map
(XEN) Bogus DMIBAR 0xfed18001 on 0000:00:00.0
(XEN) [VT-D]d0:PCIe: map 0000:00:02.0
(XEN) [VT-D]d0:PCI: map 0000:00:08.0
(XEN) [VT-D]d0:PCI: map 0000:00:14.0
(XEN) [VT-D]d0:PCI: map 0000:00:14.2
(XEN) [VT-D]d0:PCI: map 0000:00:16.0
(XEN) [VT-D]d0:PCI: map 0000:00:17.0
(XEN) [VT-D]d0:PCI: map 0000:00:1f.0
(XEN) [VT-D]d0:PCI: map 0000:00:1f.2
(XEN) [VT-D]d0:PCI: map 0000:00:1f.3
(XEN) [VT-D]d0:PCI: map 0000:00:1f.4
(XEN) [VT-D]d0:PCI: map 0000:00:1f.6
(XEN) [VT-D]d0:PCIe: map 0000:01:00.0
(XEN) [VT-D]d0:PCIe: map 0000:02:00.0
(XEN) [VT-D]iommu_enable_translation: iommu->reg = ffff82c0008de000
(XEN) [VT-D]iommu_enable_translation: iommu->reg = ffff82c0008e0000
(XEN) Initial low memory virq threshold set at 0x4000 pages.
(XEN) Scrubbing Free RAM in background
(XEN) Std. Loglevel: Errors and warnings
(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input to DOM0 (type 'CTRL-a' three times to switch input)
(XEN) Freed 480kB init memory
(XEN) [VT-D]DMAR:[DMA Write] Request device [0000:00:02.0] fault addr 0, iommu reg = ffff82c0008de000
(XEN) [VT-D]DMAR: reason 01 - Present bit in root entry is clear
(XEN) print_vtd_entries: iommu #0 dev 0000:00:02.0 gmfn 00000
(XEN)     root_entry[00] = 16bcd3001
(XEN)     context[10] = 2_16bcd2001
(XEN)     l4[000] = 16bcd1003
(XEN)     l3[000] = 16bcd0003
(XEN)     l2[000] = 16bccf003
(XEN)     l1[000] = 3
(XEN) [VT-D]INTR-REMAP: Request device [0000:f0:1f.0] fault index 0, iommu reg = ffff82c0008e0000
(XEN) [VT-D]INTR-REMAP: reason 22 - Present field in the IRTE entry is clear
mapping kernel into physical memory
about to get started...
(XEN) [VT-D]DMAR:[DMA Read] Request device [0000:00:02.0] fault addr 8e2c7000, iommu reg = ffff82c0008de000
(XEN) [VT-D]DMAR: reason 06 - PTE Read access is not set
(XEN) print_vtd_entries: iommu #0 dev 0000:00:02.0 gmfn 8e2c7
(XEN)     root_entry[00] = 16bcd3001
(XEN)     context[10] = 2_16bcd2001
(XEN)     l4[000] = 16bcd1003
(XEN)     l3[002] = 1628cb003
(XEN)     l2[071] = 0
(XEN)     l2[071] not present
(XEN) [VT-D]DMAR:[DMA Read] Request device [0000:00:02.0] fault addr 8e2fd000, iommu reg = ffff82c0008de000
(XEN) [VT-D]DMAR: reason 06 - PTE Read access is not set
(XEN) print_vtd_entries: iommu #0 dev 0000:00:02.0 gmfn 8e2fd
(XEN)     root_entry[00] = 16bcd3001
(XEN)     context[10] = 2_16bcd2001
(XEN)     l4[000] = 16bcd1003
(XEN)     l3[002] = 1628cb003
(XEN)     l2[071] = 0
(XEN)     l2[071] not present
(XEN) [VT-D]DMAR:[DMA Read] Request device [0000:00:02.0] fault addr 8e332000, iommu reg = ffff82c0008de000
(XEN) [VT-D]DMAR: reason 06 - PTE Read access is not set
(XEN) print_vtd_entries: iommu #0 dev 0000:00:02.0 gmfn 8e332
(XEN)     root_entry[00] = 16bcd3001

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