Re: [edk2-devel] [PATCH] MdePkg: fix the types of casting for TD MMIO read

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

Merged: https://github.com/tianocore/edk2/pull/5278



> -----Original Message-----
> From: Kinney, Michael D <michael.d.kinney@intel.com>
> Sent: Friday, January 19, 2024 6:49 PM
> To: devel@edk2.groups.io; Li, Zhiquan1 <zhiquan1.li@intel.com>
> Cc: Kinney, Michael D <michael.d.kinney@intel.com>
> Subject: RE: [edk2-devel] [PATCH] MdePkg: fix the types of casting for
> TD MMIO read
> 
> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
> 
> Please include Cc tags in commit message with the maintainers of
> the patch for review.  Otherwise, the maintainers may miss the
> email patches.
> 
> Thanks,
> 
> Mike
> 
> 
> 
> > -----Original Message-----
> > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Zhiquan
> > Li
> > Sent: Thursday, January 11, 2024 10:02 PM
> > To: devel@edk2.groups.io
> > Cc: Li, Zhiquan1 <zhiquan1.li@intel.com>
> > Subject: [edk2-devel] [PATCH] MdePkg: fix the types of casting for TD
> > MMIO read
> >
> > Currently the types of casting mismatch with TD MMIO read 1, 2 and 4
> > bytes, that might introduce potential issues.  So fix the types as
> > conventional MmioRead[8|16|32] does.
> >
> > Signed-off-by: Zhiquan Li <zhiquan1.li@intel.com>
> > ---
> >  MdePkg/Library/BaseIoLibIntrinsic/IoLibInternalTdx.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/MdePkg/Library/BaseIoLibIntrinsic/IoLibInternalTdx.c
> > b/MdePkg/Library/BaseIoLibIntrinsic/IoLibInternalTdx.c
> > index ec837f5eb03e..1acc3b3d9638 100644
> > --- a/MdePkg/Library/BaseIoLibIntrinsic/IoLibInternalTdx.c
> > +++ b/MdePkg/Library/BaseIoLibIntrinsic/IoLibInternalTdx.c
> > @@ -237,7 +237,7 @@ TdMmioRead8 (
> >
> >
> >    Status = TdVmCall (TDVMCALL_MMIO, TDVMCALL_ACCESS_SIZE_1,
> > TDVMCALL_ACCESS_READ, Address | TdSharedPageMask (), 0, &Value);
> >
> >    if (Status != 0) {
> >
> > -    Value = *(volatile UINT64 *)Address;
> >
> > +    Value = *(volatile UINT8 *)Address;
> >
> >    }
> >
> >
> >
> >    return (UINT8)Value;
> >
> > @@ -294,7 +294,7 @@ TdMmioRead16 (
> >
> >
> >    Status = TdVmCall (TDVMCALL_MMIO, TDVMCALL_ACCESS_SIZE_2,
> > TDVMCALL_ACCESS_READ, Address | TdSharedPageMask (), 0, &Value);
> >
> >    if (Status != 0) {
> >
> > -    Value = *(volatile UINT64 *)Address;
> >
> > +    Value = *(volatile UINT16 *)Address;
> >
> >    }
> >
> >
> >
> >    return (UINT16)Value;
> >
> > @@ -353,7 +353,7 @@ TdMmioRead32 (
> >
> >
> >    Status = TdVmCall (TDVMCALL_MMIO, TDVMCALL_ACCESS_SIZE_4,
> > TDVMCALL_ACCESS_READ, Address | TdSharedPageMask (), 0, &Value);
> >
> >    if (Status != 0) {
> >
> > -    Value = *(volatile UINT64 *)Address;
> >
> > +    Value = *(volatile UINT32 *)Address;
> >
> >    }
> >
> >
> >
> >    return (UINT32)Value;
> >
> > --
> > 2.25.1
> >
> >
> >
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> > [michael.d.kinney@intel.com]
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> >



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