linux-kernel - Re: [Qemu-devel] [PATCH v11 2/6] ACPI: Add APEI GHES Table Generation support

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Date:   Fri, 1 Sep 2017 13:51:21 +0200
From:   Igor Mammedov <imammedo@...hat.com>
To:     gengdongjiu <gengdongjiu@...wei.com>
Cc:     <mst@...hat.com>, <zhaoshenglong@...wei.com>, <lersek@...hat.com>,
        <peter.maydell@...aro.org>, <pbonzini@...hat.com>,
        <qemu-devel@...gnu.org>, <qemu-arm@...gnu.org>,
        <kvm@...r.kernel.org>, <edk2-devel@...ts.01.org>,
        <christoffer.dall@...aro.org>, <marc.zyngier@....com>,
        <will.deacon@....com>, <james.morse@....com>,
        <ard.biesheuvel@...aro.org>, <mingo@...nel.org>, <bp@...e.de>,
        <shiju.jose@...wei.com>, <zjzhang@...eaurora.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <linux-kernel@...r.kernel.org>,
        <linux-acpi@...r.kernel.org>, <devel@...ica.org>,
        <john.garry@...wei.com>, <jonathan.cameron@...wei.com>,
        <shameerali.kolothum.thodi@...wei.com>, <huangdaode@...ilicon.com>,
        <wangzhou1@...ilicon.com>, <zhengqiang10@...wei.com>,
        <wuquanming@...wei.com>, <huangshaoyu@...wei.com>,
        <linuxarm@...wei.com>
Subject: Re: [Qemu-devel] [PATCH v11 2/6] ACPI: Add APEI GHES Table
 Generation support

On Fri, 1 Sep 2017 17:58:55 +0800
gengdongjiu <gengdongjiu@...wei.com> wrote:

> Hi Igor,
> 
> On 2017/8/29 18:20, Igor Mammedov wrote:
> > On Fri, 18 Aug 2017 22:23:43 +0800
> > Dongjiu Geng <gengdongjiu@...wei.com> wrote:
[...]
> >   
> >> +void ghes_build_acpi(GArray *table_data, GArray *hardware_error,
> >> +                                            BIOSLinker *linker)
> >> +{
> >> +    uint32_t ghes_start = table_data->len;
> >> +    uint32_t address_size, error_status_address_offset;
> >> +    uint32_t read_ack_register_offset, i;
> >> +
> >> +    address_size = sizeof(struct AcpiGenericAddress) -
> >> +        offsetof(struct AcpiGenericAddress, address);  
> > it's confusing name for var,
> > AcpiGenericAddress::address is fixed unsigned 64 bit integer per spec
> > also, I'm not sure why it's needed at all.  
>  it is because other people have concern about where does the "unsigned 64 bit integer"
>  come from, they are confused about the "unsigned 64 bit integer"
>  so they suggested use sizeof. anyway I will directly use unsigned 64 bit integer.
Maybe properly named macro instead of sizeof(foo) would do the job


[...]
> >> +
> >> +        /* Build error status address*/
> >> +        build_address(table_data, linker, error_status_address_offset + i *
> >> +            sizeof(AcpiGenericHardwareErrorSourceV2), i * address_size,
> >> +            AML_SYSTEM_MEMORY, 0x40, 0, 4 /* QWord access */);  
> > just do something like this instead of build_address():
> > build_append_gas()
> > bios_linker_loader_add_pointer()  
> Thanks for the suggestion.
> 
> > 
> > also register width 0x40 looks suspicious, where does it come from?
> > While at it do you have a real hardware which has HEST table that you re trying to model after?
> > I'd like to see HEST and other related tables from it.  
> 
> Igor, what is your suspicious point? The register width 0x40 come from our host BIOS record to the System Memory space.

maybe s/0x40/ERROR_STATUS_BLOCK_POINTER_SIZE/

[...]