Re: Regression with commit c3bc26d4b4e3

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On Thu, Jun 2, 2016 at 1:08 PM, Jan Kara <jack@xxxxxxx> wrote:
> Hello,
>
> commit c3bc26d4b4e3 (ACPICA: ACPI 2.0, Hardware: Add access_width/bit_offset
> support in acpi_hw_read()) broke booting of my KVM test guest. When I
> revert that commit and commit 66b1ed5aa8d (ACPICA: ACPI 2.0, Hardware: Add
> access_width/bit_offset support for acpi_hw_write()) which looks similar,
> the vm boots again. The problem manifests itself that the qemu-kvm just
> aborts after the kernel prints:
>
> [    0.333707] ACPI: bus type PCI registered
> [    0.335494] PCI: Using configuration type 1 for base access
> [    0.472716] ACPI: Added _OSI(Module Device)
> [    0.475360] ACPI: Added _OSI(Processor Device)
> [    0.476012] ACPI: Added _OSI(3.0 _SCP Extensions)
> [    0.480035] ACPI: Added _OSI(Processor Aggregator Device)
> [    0.494742] ACPI: 2 ACPI AML tables successfully acquired and loaded
> [    0.496003]
>
> For working kernel the messages continue like:
>
> [    0.507616] ACPI: Interpreter enabled
> [    0.508018] ACPI: (supports S0 S5)
> [    0.509129] ACPI: Using IOAPIC for interrupt routing
> [    0.510717] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
> [    0.533308] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
> [    0.535049] acpi PNP0A03:00: _OSC: OS supports [Segments]
> [    0.536111] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
> [    0.538702] PCI host bridge to bus 0000:00

We have a fix in this area,
https://patchwork.kernel.org/patch/9145955/, does it help?
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