I think the macro definition (#define TDVMCALL_STATUS_RETRY 0x1) should be in https://github.com/tianocore/edk2/blob/master/MdePkg/Include/IndustryStandard/Tdx.h, together with other TDX definition.
Thank you Yao, Jiewen > -----Original Message----- > From: Sun, CepingX <[email protected]> > Sent: Thursday, November 2, 2023 5:10 PM > To: [email protected] > Cc: Sun, CepingX <[email protected]>; Aktas, Erdem > <[email protected]>; James Bottomley <[email protected]>; Yao, > Jiewen <[email protected]>; Xu, Min M <[email protected]>; Tom > Lendacky <[email protected]>; Michael Roth > <[email protected]>; Gerd Hoffmann <[email protected]> > Subject: [PATCH V2 2/2] OvmfPkg/BaseMemEncryptTdxLib: Handle retry result of > MapGPA > > From: Ceping Sun <[email protected]> > > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4572 > > According to section 3.2 of the [GHCI] document, if the return status > of MapGPA is "TDG.VP.VMCALL_RETRY", TD must retry this operation for the > pages in the region starting at the GPA specified in R11. > > In this patch, when a retry state is detected, TDVF needs to retry the > mapping with the specified address from the output results of TdVmCall. > > Reference: > [GHCI]: TDX Guest-Host-Communication Interface v1.0 > https://cdrdv2.intel.com/v1/dl/getContent/726790 > > Cc: Erdem Aktas <[email protected]> > Cc: James Bottomley <[email protected]> > Cc: Jiewen Yao <[email protected]> > Cc: Min Xu <[email protected]> > Cc: Tom Lendacky <[email protected]> > Cc: Michael Roth <[email protected]> > Cc: Gerd Hoffmann <[email protected]> > Signed-off-by: Ceping Sun <[email protected]> > --- > .../BaseMemEncryptTdxLib/MemoryEncryption.c | 43 ++++++++++++++++++- > 1 file changed, 42 insertions(+), 1 deletion(-) > > diff --git a/OvmfPkg/Library/BaseMemEncryptTdxLib/MemoryEncryption.c > b/OvmfPkg/Library/BaseMemEncryptTdxLib/MemoryEncryption.c > index a01dc98852b8..b9de699a6489 100644 > --- a/OvmfPkg/Library/BaseMemEncryptTdxLib/MemoryEncryption.c > +++ b/OvmfPkg/Library/BaseMemEncryptTdxLib/MemoryEncryption.c > @@ -38,6 +38,10 @@ typedef enum { > > STATIC PAGE_TABLE_POOL *mPageTablePool = NULL; > > +#define TDVMCALL_STATUS_RETRY 0x1 > + > +#define MAX_RETRIES_PER_PAGE 3 > + > /** > Returns boolean to indicate whether to indicate which, if any, memory > encryption is enabled > > @@ -527,6 +531,13 @@ SetOrClearSharedBit ( > EFI_STATUS Status; > EDKII_MEMORY_ACCEPT_PROTOCOL *MemoryAcceptProtocol; > > + UINT64 MapGpaRetryAddr; > + UINT32 RetryCount; > + UINT64 EndAddress; > + > + MapGpaRetryAddr = 0; > + RetryCount = 0; > + > AddressEncMask = GetMemEncryptionAddressMask (); > > // > @@ -540,7 +551,37 @@ SetOrClearSharedBit ( > PhysicalAddress &= ~AddressEncMask; > } > > - TdStatus = TdVmCall (TDVMCALL_MAPGPA, PhysicalAddress, Length, 0, 0, > NULL); > + EndAddress = PhysicalAddress + Length; > + while (RetryCount < MAX_RETRIES_PER_PAGE) { > + TdStatus = TdVmCall (TDVMCALL_MAPGPA, PhysicalAddress, Length, 0, 0, > &MapGpaRetryAddr); > + if (TdStatus != TDVMCALL_STATUS_RETRY) { > + break; > + } > + > + DEBUG ((DEBUG_VERBOSE, "%a: TdVmcall(MAPGPA) Retry PhysicalAddress > is %llx, MapGpaRetryAddr is %llx\n", __func__, PhysicalAddress, > MapGpaRetryAddr)); > + > + if ((MapGpaRetryAddr < PhysicalAddress) || (MapGpaRetryAddr >= > EndAddress)) { > + DEBUG (( > + DEBUG_ERROR, > + "%a: TdVmcall(MAPGPA) failed with MapGpaRetryAddr(%llx) less than > PhysicalAddress(%llx) or more than or equal to EndAddress(%llx) \n", > + __func__, > + MapGpaRetryAddr, > + PhysicalAddress, > + EndAddress > + )); > + break; > + } > + > + if (MapGpaRetryAddr == PhysicalAddress) { > + RetryCount++; > + continue; > + } > + > + PhysicalAddress = MapGpaRetryAddr; > + Length = EndAddress - PhysicalAddress; > + RetryCount = 0; > + } > + > if (TdStatus != 0) { > DEBUG ((DEBUG_ERROR, "%a: TdVmcall(MAPGPA) failed with %llx\n", > __func__, TdStatus)); > ASSERT (FALSE); > -- > 2.34.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#110895): https://edk2.groups.io/g/devel/message/110895 Mute This Topic: https://groups.io/mt/102337977/21656 Group Owner: [email protected] Unsubscribe: https://edk2.groups.io/g/devel/unsub [[email protected]] -=-=-=-=-=-=-=-=-=-=-=-
