From: "Gerd Hoffmann" <kraxel@redhat.com>
To: devel@edk2.groups.io, ray.ni@intel.com
Cc: Oliver Steffen <osteffen@redhat.com>,
Laszlo Ersek <lersek@redhat.com>,
"Kumar, Rahul R" <rahul.r.kumar@intel.com>
Subject: Re: [edk2-devel] [PATCH v2 5/5] UefiCpuPkg/MpInitLib: Add support for multiple HOBs to SaveCpuMpData()
Date: Wed, 21 Feb 2024 11:24:47 +0100 [thread overview]
Message-ID: <ria72vj44ybeuaigxqtqqjbbba67wwsh3lqfd2ycdvdv2zrcs2@co7np5a7yojp> (raw)
In-Reply-To: <MN6PR11MB824493A5BA0A7B15E6761EBB8C572@MN6PR11MB8244.namprd11.prod.outlook.com>
On Wed, Feb 21, 2024 at 03:48:25AM +0000, Ni, Ray wrote:
> >
> > + MaxCpusPerHob = (MAX_UINT16 - sizeof (EFI_HOB_GUID_TYPE) - sizeof
> > (MP_HAND_OFF)) / sizeof (PROCESSOR_HAND_OFF);
>
> Above formula assumes the maximum HOB length could be 0xFFFF.
Which is IMHO correct.
> But actually the maximum HOB length could be only 0xFFF8 because
> PeiCore::PeiCreateHob() contains following logic:
>
> if (0x10000 - Length <= 0x7) {
> return EFI_INVALID_PARAMETER;
> }
That Length is the *data* size, the HOB header is not included.
The "- sizeof (EFI_HOB_GUID_TYPE)" in the formula above accounts the
space needed for HOB header and GUID.
take care,
Gerd
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next prev parent reply other threads:[~2024-02-21 10:24 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-20 17:49 [edk2-devel] [PATCH v2 0/5] UefiCpuPkg/MpInitLib: Add support for multiple MP_HAND_OFF HOBs Gerd Hoffmann
2024-02-20 17:49 ` [edk2-devel] [PATCH v2 1/5] UefiCpuPkg/MpInitLib: Add support for multiple HOBs to GetMpHandOffHob Gerd Hoffmann
2024-02-21 3:35 ` Ni, Ray
2024-02-22 0:30 ` Laszlo Ersek
2024-02-20 17:49 ` [edk2-devel] [PATCH v2 2/5] UefiCpuPkg/MpInitLib: Add support for multiple HOBs to GetBspNumber() Gerd Hoffmann
2024-02-21 3:36 ` Ni, Ray
2024-02-21 3:36 ` Ni, Ray
2024-02-22 0:37 ` Laszlo Ersek
2024-02-22 0:38 ` Laszlo Ersek
2024-02-22 10:24 ` Ni, Ray
2024-02-20 17:49 ` [edk2-devel] [PATCH v2 3/5] UefiCpuPkg/MpInitLib: Add support for multiple HOBs to SwitchApContext() Gerd Hoffmann
2024-02-21 5:47 ` Ni, Ray
2024-02-22 0:44 ` Laszlo Ersek
2024-02-20 17:49 ` [edk2-devel] [PATCH v2 4/5] UefiCpuPkg/MpInitLib: Add support for multiple HOBs to MpInitLibInitialize Gerd Hoffmann
2024-02-21 3:37 ` Ni, Ray
2024-02-22 1:11 ` Laszlo Ersek
2024-02-22 12:28 ` Gerd Hoffmann
2024-02-23 0:23 ` Ni, Ray
2024-02-25 12:54 ` Laszlo Ersek
2024-02-20 17:49 ` [edk2-devel] [PATCH v2 5/5] UefiCpuPkg/MpInitLib: Add support for multiple HOBs to SaveCpuMpData() Gerd Hoffmann
2024-02-21 3:48 ` Ni, Ray
2024-02-21 10:24 ` Gerd Hoffmann [this message]
2024-02-22 1:34 ` Laszlo Ersek
2024-02-22 1:49 ` Laszlo Ersek
2024-02-22 2:17 ` Laszlo Ersek
2024-02-22 2:03 ` Laszlo Ersek
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