Re: [PATCH v2 0/7] OvmfXen: Set PcdFSBClock at runtime

From: Laszlo Ersek <lersek@redhat.com>
To: Anthony PERARD <anthony.perard@citrix.com>, devel@edk2.groups.io
Cc: xen-devel@lists.xenproject.org,
	Jordan Justen <jordan.l.justen@intel.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Julien Grall <julien@xen.org>
Subject: Re: [PATCH v2 0/7] OvmfXen: Set PcdFSBClock at runtime
Date: Thu, 25 Mar 2021 19:22:07 +0100	[thread overview]
Message-ID: <21719b4f-0da5-f5f1-bafa-9d2a399bc87d@redhat.com> (raw)
In-Reply-To: <20210325154713.670104-1-anthony.perard@citrix.com>

On 03/25/21 16:47, Anthony PERARD wrote:
> Patch series available in this git branch:
> git://xenbits.xen.org/people/aperard/ovmf.git br.apic-timer-freq-v2

I'll get to this sometime in April, possibly after the SEV-SNP series.
That shouldn't discourage others from reviewing sooner, of course.

Thanks
Laszlo

> 
> Changes in v2:
> - main change is to allow mapping of Xen pages outside of the RAM
>   see patch: "OvmfPkg/XenPlatformPei: Map extra physical address"
> - that new function allows to map the Xen shared info page (where we can find
>   information about tsc frequency) at the highest physical address allowed.
> 
> Hi,
> 
> OvmfXen uses the APIC timer, but with an hard-coded frequency that may change
> as pointed out here:
>   https://edk2.groups.io/g/devel/message/45185
>   <20190808134423.ybqg3qkpw5ucfzk4@Air-de-Roger>
> 
> This series changes that so the frequency is calculated at runtime.
> 
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2490
> 
> There is also one cleanup patch that has nothing to do with the rest.
> 
> Cheers,
> 
> Anthony PERARD (7):
>   OvmfPkg/XenResetVector: Silent a warning from nasm
>   MdePkg: Allow PcdFSBClock to by Dynamic
>   OvmfPkg/IndustryStandard/Xen: Apply EDK2 coding style to
>     XEN_VCPU_TIME_INFO
>   OvmfPkg/IndustryStandard: Introduce PageTable.h
>   OvmfPkg/XenPlatformPei: Map extra physical address
>   OvmfPkg/XenPlatformPei: Calibrate APIC timer frequency
>   OvmfPkg/OvmfXen: Set PcdFSBClock
> 
>  MdePkg/MdePkg.dec                             |   8 +-
>  OvmfPkg/OvmfXen.dsc                           |   4 +-
>  OvmfPkg/XenPlatformPei/XenPlatformPei.inf     |   4 +
>  .../IndustryStandard/PageTable.h}             | 117 +-------
>  OvmfPkg/Include/IndustryStandard/Xen/xen.h    |  17 +-
>  .../BaseMemEncryptSevLib/X64/VirtualMemory.h  | 143 +---------
>  OvmfPkg/XenPlatformPei/Platform.h             |  10 +
>  OvmfPkg/XenPlatformPei/Platform.c             |   1 +
>  OvmfPkg/XenPlatformPei/Xen.c                  | 252 ++++++++++++++++++
>  OvmfPkg/XenResetVector/Ia32/XenPVHMain.asm    |   2 +-
>  10 files changed, 287 insertions(+), 271 deletions(-)
>  copy OvmfPkg/{Library/BaseMemEncryptSevLib/X64/VirtualMemory.h => Include/IndustryStandard/PageTable.h} (60%)
> 