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Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device

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On 5 October 2015 at 13:40, Gabriel L. Somlo <somlo@cmu.edu> wrote:
> In addition, Michael's comment earlier in the thread suggests that
> even my current acpi version isn't sufficiently "orthodox" w.r.t.
> ACPI, and I should be providing the hardware access routine as
> an ACPI/AML routine, to avoid race conditions with the rest of ACPI,
> and for encapsulation. I.e. it's even rude to use the fw_cfg node's
> ACPI _CRS method (the part where I'd be treating it like a DT stand-in
> only to query fw_cfg's hardware specifics).

If you want to try to support "firmware might also be reading
fw_cfg at the same time as the kernel" this is a (painful)
problem regardless of how the kernel figures out whether a
fw_cfg device is present. I had assumed that one of the design
assumptions of this series was that firmware would only
read the fw_cfg before booting the guest kernel and never touch
it afterwards. If it might touch it later then letting the
guest kernel also mess with fw_cfg seems like a really bad idea.

thanks
-- PMM
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[PATCH v3 0/4] SysFS driver for QEMU fw_cfg device "Gabriel L. Somlo" <somlo@cmu.edu> - 2015-10-04 01:50 +0200
  Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device Mark Rutland <mark.rutland@arm.com> - 2015-10-05 12:10 +0200
    Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device Paolo Bonzini <pbonzini@redhat.com> - 2015-10-05 13:50 +0200
      Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device Mark Rutland <mark.rutland@arm.com> - 2015-10-05 14:30 +0200
        Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device "Gabriel L. Somlo" <somlo@cmu.edu> - 2015-10-05 14:50 +0200
          Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device Mark Rutland <mark.rutland@arm.com> - 2015-10-05 15:00 +0200
            Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device "Gabriel L. Somlo" <somlo@cmu.edu> - 2015-10-05 15:30 +0200
    Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device "Gabriel L. Somlo" <somlo@cmu.edu> - 2015-10-05 14:50 +0200
      Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device Peter Maydell <peter.maydell@linaro.org> - 2015-10-05 15:00 +0200
        Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device "Gabriel L. Somlo" <somlo@cmu.edu> - 2015-10-05 15:20 +0200
        Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device Paolo Bonzini <pbonzini@redhat.com> - 2015-10-05 15:20 +0200
      Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device Mark Rutland <mark.rutland@arm.com> - 2015-10-05 15:10 +0200
        Re: [PATCH v3 0/4] SysFS driver for QEMU fw_cfg device Laszlo Ersek <lersek@redhat.com> - 2015-10-06 09:20 +0200

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