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From: "Ni, Ray" <ray.ni@intel.com>
To: Ard Biesheuvel <ardb@kernel.org>, "devel@edk2.groups.io"
<devel@edk2.groups.io>
CC: "Yao, Jiewen" <jiewen.yao@intel.com>, Gerd Hoffmann <kraxel@redhat.com>,
Taylor Beebe <t@taylorbeebe.com>, Oliver Smith-Denny <osd@smith-denny.com>,
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<quic_llindhol@quicinc.com>, Sunil V L <sunilvl@ventanamicro.com>,
"Warkentin, Andrei" <andrei.warkentin@intel.com>
Subject: Re: [RFC PATCH 05/10] MdeModulePkg: Define memory attribute PPI
Thread-Topic: [RFC PATCH 05/10] MdeModulePkg: Define memory attribute PPI
Thread-Index: AQHZjxWlHob9PT2NkUGSKmYyuvRK5K9yagxA
Date: Tue, 30 May 2023 07:15:24 +0000
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References: <20230525143041.1172989-1-ardb@kernel.org>
<20230525143041.1172989-6-ardb@kernel.org>
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1.=20
The PPI interface supports to set and clear any attributes with single invo=
cation.
That's much better than the existing UEFI protocol prototype which requires=
caller to call the interfaces
twice to set and clear some attributes.
So far I see two patterns for attributes setting:
*. The patten in this patch: SetMask/ClearMask
*. The pattern I used in PageTableLib: Attribute/Mask.
I think from caller side, they provide the same capabilities.
The difference is SetMask/ClearMask expects callers to not set the same BIT=
in both
SetMask/ClearMask.
(I thought there would be similar existing interfaces as pattern 2. But I d=
idn't find any now.)
Do you mind to align to pattern #2?
2.
When a memory region is marked from not-present to present, PageTableLib ex=
pects
caller to supply all memory attributes (including RW, NX, etc.) as the lib =
implementation doesn't
want to carry any default attributes..
Do you think the MemoryAttribute PPI should expect the same to caller?
Thanks,
Ray
> -----Original Message-----
> From: Ard Biesheuvel <ardb@kernel.org>
> Sent: Thursday, May 25, 2023 10:31 PM
> To: devel@edk2.groups.io
> Cc: Ard Biesheuvel <ardb@kernel.org>; Ni, Ray <ray.ni@intel.com>; Yao, Ji=
ewen
> <jiewen.yao@intel.com>; Gerd Hoffmann <kraxel@redhat.com>; Taylor Beebe
> <t@taylorbeebe.com>; Oliver Smith-Denny <osd@smith-denny.com>; Bi, Dandan
> <dandan.bi@intel.com>; Gao, Liming <gaoliming@byosoft.com.cn>; Kinney,
> Michael D <michael.d.kinney@intel.com>; Leif Lindholm
> <quic_llindhol@quicinc.com>; Sunil V L <sunilvl@ventanamicro.com>; Warken=
tin,
> Andrei <andrei.warkentin@intel.com>
> Subject: [RFC PATCH 05/10] MdeModulePkg: Define memory attribute PPI
>=20
> Define a PPI interface that may be used by the PEI core or other PEIMs
> to manage permissions on memory ranges. This is primarily intended for
> restricting permissions to what is actually needed for correct execution
> by the code in question, and for limiting the use of memory mappings
> that are both writable and executable at the same time.
>=20
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> ---
> MdeModulePkg/Include/Ppi/MemoryAttribute.h | 78 ++++++++++++++++++++
> MdeModulePkg/MdeModulePkg.dec | 3 +
> 2 files changed, 81 insertions(+)
>=20
> diff --git a/MdeModulePkg/Include/Ppi/MemoryAttribute.h
> b/MdeModulePkg/Include/Ppi/MemoryAttribute.h
> new file mode 100644
> index 0000000000000000..5ff31185ab4183f8
> --- /dev/null
> +++ b/MdeModulePkg/Include/Ppi/MemoryAttribute.h
> @@ -0,0 +1,78 @@
> +/** @file
>=20
> +
>=20
> +Copyright (c) 2023, Google LLC. All rights reserved.<BR>
>=20
> +
>=20
> +SPDX-License-Identifier: BSD-2-Clause-Patent
>=20
> +
>=20
> +**/
>=20
> +
>=20
> +#ifndef EDKII_MEMORY_ATTRIBUTE_PPI_H_
>=20
> +#define EDKII_MEMORY_ATTRIBUTE_PPI_H_
>=20
> +
>=20
> +#include <Uefi/UefiSpec.h>
>=20
> +
>=20
> +///
>=20
> +/// Global ID for the EDKII_MEMORY_ATTRIBUTE_PPI.
>=20
> +///
>=20
> +#define EDKII_MEMORY_ATTRIBUTE_PPI_GUID \
>=20
> + { \
>=20
> + 0x1be840de, 0x2d92, 0x41ec, { 0xb6, 0xd3, 0x19, 0x64, 0x13, 0x50, 0x=
51,
> 0xfb } \
>=20
> + }
>=20
> +
>=20
> +///
>=20
> +/// Forward declaration for the EDKII_MEMORY_ATTRIBUTE_PPI.
>=20
> +///
>=20
> +typedef struct _EDKII_MEMORY_ATTRIBUTE_PPI
> EDKII_MEMORY_ATTRIBUTE_PPI;
>=20
> +
>=20
> +/**
>=20
> + Set the requested memory permission attributes on a region of memory.
>=20
> +
>=20
> + BaseAddress and Length must be aligned to EFI_PAGE_SIZE.
>=20
> +
>=20
> + Both SetMask and ClearMask may contain any combination of
> EFI_MEMORY_RP,
>=20
> + EFI_MEMORY_RO and EFI_MEMORY_XP, with the following restrictions:
>=20
> + - each constant may appear in either SetMask or ClearMask, but not in =
both;
>=20
> + - SetMask or ClearMask may be 0x0, but not both.
>=20
> +
>=20
> + @param[in] This The protocol instance pointer.
>=20
> + @param[in] BaseAddress The physical address that is the start add=
ress of
>=20
> + a memory region.
>=20
> + @param[in] Length The size in bytes of the memory region.
>=20
> + @param[in] SetMask Mask of memory attributes to set.
>=20
> + @param[in] ClearMask Mask of memory attributes to clear.
>=20
> +
>=20
> + @retval EFI_SUCCESS The attributes were set for the memory r=
egion.
>=20
> + @retval EFI_INVALID_PARAMETER Length is zero.
>=20
> + Invalid combination of SetMask and Clear=
Mask.
>=20
> + BaseAddress or Length is not suitably al=
igned.
>=20
> + @retval EFI_UNSUPPORTED The processor does not support one or mo=
re
>=20
> + bytes of the memory resource range speci=
fied
>=20
> + by BaseAddress and Length.
>=20
> + The bit mask of attributes is not suppor=
ted for
>=20
> + the memory resource range specified by
>=20
> + BaseAddress and Length.
>=20
> + @retval EFI_OUT_OF_RESOURCES Requested attributes cannot be applied
> due to
>=20
> + lack of system resources.
>=20
> +
>=20
> +**/
>=20
> +typedef
>=20
> +EFI_STATUS
>=20
> +(EFIAPI *EDKII_MEMORY_ATTRIBUTE_SET_PERMISSIONS)(
>=20
> + IN EDKII_MEMORY_ATTRIBUTE_PPI *This,
>=20
> + IN EFI_PHYSICAL_ADDRESS BaseAddress,
>=20
> + IN UINT64 Length,
>=20
> + IN UINT64 SetMask,
>=20
> + IN UINT64 ClearMask
>=20
> + );
>=20
> +
>=20
> +///
>=20
> +/// This PPI contains a set of services to manage memory permission attr=
ibutes.
>=20
> +///
>=20
> +struct _EDKII_MEMORY_ATTRIBUTE_PPI {
>=20
> + EDKII_MEMORY_ATTRIBUTE_SET_PERMISSIONS SetPermissions;
>=20
> +};
>=20
> +
>=20
> +extern EFI_GUID gEdkiiMemoryAttributePpiGuid;
>=20
> +
>=20
> +#endif
>=20
> +
>=20
> diff --git a/MdeModulePkg/MdeModulePkg.dec
> b/MdeModulePkg/MdeModulePkg.dec
> index 95dd077e19b3a901..d65dae18aa81e569 100644
> --- a/MdeModulePkg/MdeModulePkg.dec
> +++ b/MdeModulePkg/MdeModulePkg.dec
> @@ -528,6 +528,9 @@ [Ppis]
> gEdkiiPeiCapsuleOnDiskPpiGuid =3D { 0x71a9ea61, 0x5a35, 0x=
4a5d, { 0xac,
> 0xef, 0x9c, 0xf8, 0x6d, 0x6d, 0x67, 0xe0 } }
>=20
> gEdkiiPeiBootInCapsuleOnDiskModePpiGuid =3D { 0xb08a11e4, 0xe2b7, 0x=
4b75,
> { 0xb5, 0x15, 0xaf, 0x61, 0x6, 0x68, 0xbf, 0xd1 } }
>=20
>=20
>=20
> + ## Include/Ppi/MemoryAttribute.h
>=20
> + gEdkiiMemoryAttributePpiGuid =3D { 0x1be840de, 0x2d92, 0x=
41ec, { 0xb6,
> 0xd3, 0x19, 0x64, 0x13, 0x50, 0x51, 0xfb } }
>=20
> +
>=20
> [Protocols]
>=20
> ## Load File protocol provides capability to load and unload EFI image=
into
> memory and execute it.
>=20
> # Include/Protocol/LoadPe32Image.h
>=20
> --
> 2.39.2