Re: [PATCH v2] OvmfPkg: Update I/O port related to ACPI devices for CloudHv

["Boeuf, Sebastien" <sebastien.boeuf@intel.com>]

Hi Jiewen,

After I looked into the UefiPayload example, I have a few questions on
how to implement things in OvmfPkg:

- Do you expect EFI_HOB_PLATFORM_INFO to be extended with two
additional fields AcpiTimerAddress and AcpiShutdownAddress? Or do you
think the ACPI_BOARD_INFO should be copied over from the the
UefiPayload package?

- Is InitializePlatform() from OvmfPkg/PlatformPei/Platform.c the
correct place where the FADT parsing should happen? I would need the
platform info HOB to be accessible from
OvmfPkg/Library/AcpiTimerLib/DxeAcpiTimerLib.c,
OvmfPkg/Library/AcpiTimerLib/BaseRomAcpiTimerLib.c,
OvmfPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.c,
OvmfPkg/Library/ResetSystemLib/DxeResetShutdown.c, and
OvmfPkg/Library/ResetSystemLib/BaseResetShutdown.c. 

Thanks,
Sebastien

On Tue, 2022-09-06 at 15:57 +0000, Yao, Jiewen wrote:
> One good example is in UefiPayloadPkg.
>  
> 1. At entrypoint, the UefiPayload parses the ACPI table and build
> gUefiAcpiBoardInfoGuid.https://github.com/tianocore/edk2/blob/mas
> ter/UefiPayloadPkg/UefiPayloadEntry/AcpiTable.c#L23
>  
> 1. Later, AcpiTimer driver uses the ACPI data in
> gUefiAcpiBoardInfoGuid.https://github.com/tianocore/edk2/blob/mas
> ter/UefiPayloadPkg/Library/AcpiTimerLib/AcpiTimerLib.c#L49
>  
> 1. Other driver may also use the ACPI data, such as
> PciExpressAddress. (from
> MCFG).https://github.com/tianocore/edk2/blob/master/UefiPayloadPk
> g/Library/PciSegmentInfoLibAcpiBoardInfo/PciSegmentInfoLibAcpiBoa
> rdInfo.c#L55
>  
>  
> Thank you
> Yao Jiewen
>  
>  
> From: Boeuf, Sebastien <sebastien.boeuf@intel.com> 
> Sent: Tuesday, September 6, 2022 11:41 PM
> To: Yao, Jiewen <jiewen.yao@intel.com>
> Cc: Justen, Jordan L <jordan.l.justen@intel.com>; kraxel@redhat.com;
> devel@edk2.groups.io
> Subject: Re: [PATCH v2] OvmfPkg: Update I/O port related to ACPI
> devices for CloudHv
>  
> Hi Jiewen,
>  
> We patched Cloud Hypervisor to support both I/O ports for at least
> two versions. And of course at some point users will have to rely on
> latest CloudHv binary (which we always build).
>  
> One improvement could be to retrieve the I/O ports addresses from the
> FADT table. Do you know if there's some code already doing that in
> OVMF?
>  
> Thanks,
> Sebastien
> From: Yao, Jiewen <jiewen.yao@intel.com>
> Sent: Tuesday, September 6, 2022 4:27 PM
> To: Boeuf, Sebastien <sebastien.boeuf@intel.com>
> Cc: Justen, Jordan L <jordan.l.justen@intel.com>;kraxel@redhat.com
> <kraxel@redhat.com>;devel@edk2.groups.io <devel@edk2.groups.io>
> Subject: RE: [PATCH v2] OvmfPkg: Update I/O port related to ACPI
> devices for CloudHv
>  
> This seems a big incompatible change.
>  
> I feel this is weird to hardcode the configuration here.
>  
> How the OVMF binary knows it runs on a new CloudHv or old CloudHv?
>  
> Can we have a mechanism to detect the data at runtime? E.g. read some
> PCI register ?
>  
>  
>  
>  
> From: Boeuf, Sebastien <sebastien.boeuf@intel.com>
> Sent: Tuesday, September 6, 2022 10:08 PM
> To: Yao, Jiewen <jiewen.yao@intel.com>
> Cc: Justen, Jordan L <jordan.l.justen@intel.com>;kraxel@redhat.com;
> devel@edk2.groups.io
> Subject: Re: [PATCH v2] OvmfPkg: Update I/O port related to ACPI
> devices for CloudHv
>  
> Hi Jiewen,
>  
> Do you think this could be merged?
>  
> Thanks,
> Sebastien
> From: Boeuf, Sebastien <sebastien.boeuf@intel.com>
> Sent: Friday, August 19, 2022 11:59 AM
> To: devel@edk2.groups.io <devel@edk2.groups.io>
> Cc: Yao, Jiewen <jiewen.yao@intel.com>; Justen, Jordan L
> <jordan.l.justen@intel.com>;kraxel@redhat.com <kraxel@redhat.com>;
> Boeuf, Sebastien <sebastien.boeuf@intel.com>
> Subject: [PATCH v2] OvmfPkg: Update I/O port related to ACPI devices
> for CloudHv
>  
> From: Sebastien Boeuf <sebastien.boeuf@intel.com>
> 
> Both ACPI shutdown and ACPI PM timer devices has been moved to
> different
> port addresses in the latest version of Cloud Hypervisor. These
> changes
> need to be reflected on the OVMF firmware.
> 
> Acked-by: Gerd Hoffmann <kraxel@redhat.com>
> Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
> ---
>  OvmfPkg/Include/IndustryStandard/CloudHv.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/OvmfPkg/Include/IndustryStandard/CloudHv.h
> b/OvmfPkg/Include/IndustryStandard/CloudHv.h
> index d31ecc9eec..527c236f48 100644
> --- a/OvmfPkg/Include/IndustryStandard/CloudHv.h
> +++ b/OvmfPkg/Include/IndustryStandard/CloudHv.h
> @@ -16,12 +16,12 @@
>  //
> 
>  // ACPI timer address
> 
>  //
> 
> -#define CLOUDHV_ACPI_TIMER_IO_ADDRESS  0xb008
> 
> +#define CLOUDHV_ACPI_TIMER_IO_ADDRESS  0x0608
> 
>  
> 
>  //
> 
>  // ACPI shutdown device address
> 
>  //
> 
> -#define CLOUDHV_ACPI_SHUTDOWN_IO_ADDRESS  0x03c0
> 
> +#define CLOUDHV_ACPI_SHUTDOWN_IO_ADDRESS  0x0600
> 
>  
> 
>  //
> 
>  // 32-bit MMIO memory hole base address
> 

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