Re: [PATCH 1/1] MdeModulePkg/Gcd: Fix bug of attribute conversion

["Kinney, Michael D" <michael.d.kinney@intel.com>]

Star,

This commit breaks Vlv2TbltDevicePkg.

On this platform, there are 2 calls to 
gDS->SetMemorySpaceAttributes() for an MMIO
range to set only the EFI_MEMORY_RUNTIME bit.

With this commit, ConverToCpuArchAttributes()returns 0,
and 0 is passed to gCpu->SetMemoryAttributes()that
returns EFI_INVALID_PARAMETER on Vlv2TbltDevicePkg.

Before this commit, ConverToCpuArchAttributes()
returns INVALID_CPU_ARCH_ATTRIBUTES which causes
the call to gCpu->SetMemoryAttributes()to be
skipped so no error is generated.

I think the right fix is to skip the call to 
gCpu->SetMemoryAttributes() if CpuArchAttributes
is 0 so a call that only sets the RUNTIME attribute
can be supported along with call the set both the
RUNTIME bit and other cache related bits.

I will send a patch soon with the proposed fix.

Mike

> -----Original Message-----
> From: Zeng, Star
> Sent: Sunday, April 1, 2018 10:59 PM
> To: Heyi Guo <heyi.guo@linaro.org>; edk2-
> devel@lists.01.org
> Cc: Yi Li <phoenix.liyi@huawei.com>; Renhao Liang
> <liangrenhao@huawei.com>; Dong, Eric
> <eric.dong@intel.com>; Kinney, Michael D
> <michael.d.kinney@intel.com>; Gao, Liming
> <liming.gao@intel.com>; Wang, Jian J
> <jian.j.wang@intel.com>; Ni, Ruiyu <ruiyu.ni@intel.com>;
> Zeng, Star <star.zeng@intel.com>
> Subject: RE: [PATCH 1/1] MdeModulePkg/Gcd: Fix bug of
> attribute conversion
> 
> Pushed at 5b91bf82c67b586b9588cbe4bbffa1588f6b5926.
> 
> Thanks,
> Star
> -----Original Message-----
> From: Heyi Guo [mailto:heyi.guo@linaro.org]
> Sent: Thursday, March 29, 2018 4:20 PM
> To: edk2-devel@lists.01.org
> Cc: Heyi Guo <heyi.guo@linaro.org>; Yi Li
> <phoenix.liyi@huawei.com>; Renhao Liang
> <liangrenhao@huawei.com>; Zeng, Star
> <star.zeng@intel.com>; Dong, Eric <eric.dong@intel.com>;
> Kinney, Michael D <michael.d.kinney@intel.com>; Gao,
> Liming <liming.gao@intel.com>; Wang, Jian J
> <jian.j.wang@intel.com>; Ni, Ruiyu <ruiyu.ni@intel.com>
> Subject: [PATCH 1/1] MdeModulePkg/Gcd: Fix bug of
> attribute conversion
> 
> For gDS->SetMemorySpaceAttributes(), when user passes a
> combined memory attribute including CPU arch attribute
> and other attributes, like EFI_MEMORY_RUNTIME,
> ConverToCpuArchAttributes() will return
> INVALID_CPU_ARCH_ATTRIBUTES and skip setting page/cache
> attribute for the specified memory space.
> 
> We don't see any reason to forbid combining CPU arch
> attributes and non-CPU-arch attributes when calling gDS-
> >SetMemorySpaceAttributes(), so we remove the check code
> in ConverToCpuArchAttributes(); the remaining code is
> enough to grab the interested bits for
> Cpu->SetMemoryAttributes().
> 
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Heyi Guo <heyi.guo@linaro.org>
> Signed-off-by: Yi Li <phoenix.liyi@huawei.com>
> Signed-off-by: Renhao Liang <liangrenhao@huawei.com>
> Cc: Star Zeng <star.zeng@intel.com>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Michael D Kinney <michael.d.kinney@intel.com>
> Cc: Liming Gao <liming.gao@intel.com>
> Cc: Jian J Wang <jian.j.wang@intel.com>
> Cc: Ruiyu Ni <ruiyu.ni@intel.com>
> ---
>  MdeModulePkg/Core/Dxe/Gcd/Gcd.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/MdeModulePkg/Core/Dxe/Gcd/Gcd.c
> b/MdeModulePkg/Core/Dxe/Gcd/Gcd.c index
> 77f4adb4bc01..907245a3f512 100644
> --- a/MdeModulePkg/Core/Dxe/Gcd/Gcd.c
> +++ b/MdeModulePkg/Core/Dxe/Gcd/Gcd.c
> @@ -673,11 +673,6 @@ ConverToCpuArchAttributes (  {
>    UINT64      CpuArchAttributes;
> 
> -  if ((Attributes & ~(EXCLUSIVE_MEMORY_ATTRIBUTES |
> -                      NONEXCLUSIVE_MEMORY_ATTRIBUTES))
> != 0) {
> -    return INVALID_CPU_ARCH_ATTRIBUTES;
> -  }
> -
>    CpuArchAttributes = Attributes &
> NONEXCLUSIVE_MEMORY_ATTRIBUTES;
> 
>    if ( (Attributes & EFI_MEMORY_UC) == EFI_MEMORY_UC) {
> --
> 2.7.4