Sounds good, I'll have a look at these tomorrow and I'll try to come up with a proper patch :)

Thanks,
Sebastien 
From: Yao, Jiewen <jiewen.yao@intel.com>
Sent: Tuesday, September 6, 2022 5:57:16 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
 

One good example is in UefiPayloadPkg.

 

  1. At entrypoint, the UefiPayload parses the ACPI table and build gUefiAcpiBoardInfoGuid. https://github.com/tianocore/edk2/blob/master/UefiPayloadPkg/UefiPayloadEntry/AcpiTable.c#L23

 

  1. Later, AcpiTimer driver uses the ACPI data in gUefiAcpiBoardInfoGuid. https://github.com/tianocore/edk2/blob/master/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/UefiPayloadPkg/Library/PciSegmentInfoLibAcpiBoardInfo/PciSegmentInfoLibAcpiBoardInfo.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

--
2.34.1

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