From: "Laszlo Ersek" <lersek@redhat.com>
To: devel@edk2.groups.io, dhaval@rivosinc.com,
Oleksiy Yakovlev <oleksiyy@ami.com>
Subject: Re: [edk2-devel] [PATCH V3 0/4] Add New Memory Attributes
Date: Fri, 17 Nov 2023 09:25:47 +0100 [thread overview]
Message-ID: <564e680a-9373-98ab-fbd6-5b060447c17b@redhat.com> (raw)
In-Reply-To: <26234.1700208464926645589@groups.io>
On 11/17/23 09:07, Dhaval Sharma wrote:
> Hi,
> I wanted to revisit this thread and I am maintaining the context as
> there are a lot of details already mentioned here regarding EFI_MEMORY_SP.
> Other than what has been addressed here, we also would like to have an
> option in edk2 to *avoid* using this type of memory for its own
> purposes. This seems like one of the motivations for original request
> and is being honored by OS today but not edk2 as it does not have any
> specific implementation today which takes this attribute into consideration.
> I would like to add PCD based implementation which informs edk2 NOT to
> use this memory for its own purposes and leave it alone (as still
> available memory to OS).
>
> Specific-purpose memory (SPM). The memory is earmarked for
> specific purposes such as for specific device drivers or applications.
> The SPM attribute serves as a hint to the OS to avoid allocating this
> memory for core OS data or code that can not be relocated.
> Prolonged use of this memory for purposes other than the intended
> purpose may result in suboptimal platform performance.
>
> Some more context:
> https://lwn.net/Articles/784971/
Why was EFI_MEMORY_SP introduced as a memory attribute, rather than its
own memory type?
Laszlo
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next prev parent reply other threads:[~2023-11-17 8:25 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-02 20:50 [PATCH V3 0/4] Add New Memory Attributes Oleksiy Yakovlev
2020-07-02 20:50 ` [PATCH V3 1/4] MdePkg: " Oleksiy Yakovlev
2020-07-06 9:11 ` [edk2-devel] " Laszlo Ersek
2020-07-02 20:50 ` [PATCH V3 2/4] MdeModulePkg: " Oleksiy Yakovlev
2020-07-06 9:13 ` [edk2-devel] " Laszlo Ersek
2020-07-13 16:12 ` Laszlo Ersek
2020-07-02 20:50 ` [PATCH V3 3/4] UefiCpuPkg: Update EFI_MEMORY_CACHETYPE_MASK definition Oleksiy Yakovlev
2020-07-06 9:16 ` [edk2-devel] " Laszlo Ersek
2020-07-13 16:13 ` Laszlo Ersek
2020-07-14 0:13 ` Dong, Eric
2020-07-02 20:50 ` [PATCH V3 4/4] UefiCpuPkg: Add New Memory Attributes Oleksiy Yakovlev
2020-07-13 16:14 ` [edk2-devel] " Laszlo Ersek
2020-07-14 0:16 ` Dong, Eric
2020-07-06 9:57 ` [edk2-devel] [PATCH V3 0/4] " Laszlo Ersek
2020-07-15 15:07 ` Laszlo Ersek
2023-11-17 8:07 ` Dhaval Sharma
2023-11-17 8:25 ` Laszlo Ersek [this message]
2023-11-20 4:59 ` Dhaval Sharma
2023-11-21 15:03 ` Laszlo Ersek
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