Re: [edk2-devel] [PATCH 1/1] AmpereAltraPkg/FlashLib: Fix kernel crash if not call SetVirtualAddressMap()

[Chuong Tran <chuong@amperemail.onmicrosoft.com>]

Acked-by: Chuong Tran <chuong@os.amperecomputing.com>

Thanks,
Chuong

On 8/14/2024 10:22 AM, Nhi Pham wrote:
> From: Chuong Tran <chuong@os.amperecomputing.com>
>
> OS kernel with greater than or equal to 48-bit VA space avoids EFI's
> SetVirtualAddressMap() runtime service on Arm64 and simply uses the 1:1
> address mapping that UEFI used at booting. However, AmpereAltraPkg's
> RuntimeFlashLib replies on function call SetVirtualAddressMap() to
> determine whether it is in boot time or run-time. If
> SetVirtualAddressMap() has not been called prior, it causes the kernel
> crash. This patch fixes that issue by removing the separation between
> UEFI boot time and run-time in RuntimeFlashLib.
>
> Signed-off-by: Nhi Pham <nhi@os.amperecomputing.com>
> ---
>   Silicon/Ampere/AmpereAltraPkg/Library/FlashLib/FlashLibCommon.c  | 11 +++--------
>   Silicon/Ampere/AmpereAltraPkg/Library/FlashLib/RuntimeFlashLib.c |  2 --
>   2 files changed, 3 insertions(+), 10 deletions(-)
>
> diff --git a/Silicon/Ampere/AmpereAltraPkg/Library/FlashLib/FlashLibCommon.c b/Silicon/Ampere/AmpereAltraPkg/Library/FlashLib/FlashLibCommon.c
> index 83695c857a11..0b000c2aad46 100644
> --- a/Silicon/Ampere/AmpereAltraPkg/Library/FlashLib/FlashLibCommon.c
> +++ b/Silicon/Ampere/AmpereAltraPkg/Library/FlashLib/FlashLibCommon.c
> @@ -15,7 +15,6 @@
>   
>   #include "FlashLibCommon.h"
>   
> -BOOLEAN                       gFlashLibRuntime = FALSE;
>   UINT8                         *gFlashLibPhysicalBuffer;
>   UINT8                         *gFlashLibVirtualBuffer;
>   
> @@ -34,13 +33,9 @@ ConvertToPhysicalBuffer (
>     IN UINT32 Size
>     )
>   {
> -  if (gFlashLibRuntime) {
> -    ASSERT (VirtualPtr != NULL);
> -    CopyMem (gFlashLibVirtualBuffer, VirtualPtr, Size);
> -    return gFlashLibPhysicalBuffer;
> -  }
> -
> -  return VirtualPtr;
> +  ASSERT (VirtualPtr != NULL);
> +  CopyMem (gFlashLibVirtualBuffer, VirtualPtr, Size);
> +  return gFlashLibPhysicalBuffer;
>   }
>   
>   /**
> diff --git a/Silicon/Ampere/AmpereAltraPkg/Library/FlashLib/RuntimeFlashLib.c b/Silicon/Ampere/AmpereAltraPkg/Library/FlashLib/RuntimeFlashLib.c
> index 2dcd13e08146..14cef8e17ece 100644
> --- a/Silicon/Ampere/AmpereAltraPkg/Library/FlashLib/RuntimeFlashLib.c
> +++ b/Silicon/Ampere/AmpereAltraPkg/Library/FlashLib/RuntimeFlashLib.c
> @@ -35,8 +35,6 @@ FlashLibAddressChangeEvent (
>   {
>     gRT->ConvertPointer (0x0, (VOID **)&gFlashLibVirtualBuffer);
>     gRT->ConvertPointer (0x0, (VOID **)&mMmCommunicationProtocol);
> -
> -  gFlashLibRuntime = TRUE;
>   }
>   
>   /**



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