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charset="utf-8" The patch uses newly introduced VIRTIO_DEVICE_PROTOCOL.MapSharedBuffer() to map system memory to device address and programs the vring descriptors with device addresses. Cc: Ard Biesheuvel Cc: Jordan Justen Cc: Tom Lendacky Cc: Laszlo Ersek Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Brijesh Singh --- OvmfPkg/VirtioRngDxe/VirtioRng.h | 1 + OvmfPkg/VirtioRngDxe/VirtioRng.c | 47 +++++++++++++++++--- 2 files changed, 43 insertions(+), 5 deletions(-) diff --git a/OvmfPkg/VirtioRngDxe/VirtioRng.h b/OvmfPkg/VirtioRngDxe/Virtio= Rng.h index 998f9fae48c2..b372d84c1ebc 100644 --- a/OvmfPkg/VirtioRngDxe/VirtioRng.h +++ b/OvmfPkg/VirtioRngDxe/VirtioRng.h @@ -38,6 +38,7 @@ typedef struct { EFI_EVENT ExitBoot; // DriverBindingStart 0 VRING Ring; // VirtioRingInit 2 EFI_RNG_PROTOCOL Rng; // VirtioRngInit 1 + VOID *RingMap; // VirtioRngInit 1 } VIRTIO_RNG_DEV; =20 #define VIRTIO_ENTROPY_SOURCE_FROM_RNG(RngPointer) \ diff --git a/OvmfPkg/VirtioRngDxe/VirtioRng.c b/OvmfPkg/VirtioRngDxe/Virtio= Rng.c index e20602ac7225..5ff54867616a 100644 --- a/OvmfPkg/VirtioRngDxe/VirtioRng.c +++ b/OvmfPkg/VirtioRngDxe/VirtioRng.c @@ -140,11 +140,15 @@ VirtioRngGetRNG ( UINT32 Len; UINT32 BufferSize; EFI_STATUS Status; + UINTN NumPages; + EFI_PHYSICAL_ADDRESS DeviceAddress; + VOID *Mapping; =20 if (This =3D=3D NULL || RNGValueLength =3D=3D 0 || RNGValue =3D=3D NULL)= { return EFI_INVALID_PARAMETER; } =20 + Dev =3D VIRTIO_ENTROPY_SOURCE_FROM_RNG (This); // // We only support the raw algorithm, so reject requests for anything el= se // @@ -153,12 +157,18 @@ VirtioRngGetRNG ( return EFI_UNSUPPORTED; } =20 - Buffer =3D (volatile UINT8 *)AllocatePool (RNGValueLength); - if (Buffer =3D=3D NULL) { + NumPages =3D EFI_SIZE_TO_PAGES (RNGValueLength); + Status =3D VirtioAllocateSharedPages (Dev->VirtIo, NumPages, (VOID *)&Bu= ffer); + if (EFI_ERROR (Status)) { return EFI_DEVICE_ERROR; } =20 - Dev =3D VIRTIO_ENTROPY_SOURCE_FROM_RNG (This); + Status =3D VirtioMapSharedBufferWrite (Dev->VirtIo, (VOID *)Buffer, + RNGValueLength, &DeviceAddress, &Mapping); + if (EFI_ERROR (Status)) { + VirtioFreeSharedPages (Dev->VirtIo, NumPages, (VOID *)Buffer); + return EFI_DEVICE_ERROR; + } =20 // // The Virtio RNG device may return less data than we asked it to, and c= an @@ -170,7 +180,7 @@ VirtioRngGetRNG ( =20 VirtioPrepare (&Dev->Ring, &Indices); VirtioAppendDesc (&Dev->Ring, - (UINTN)Buffer + Index, + (UINTN)DeviceAddress + Index, BufferSize, VRING_DESC_F_WRITE, &Indices); @@ -178,19 +188,22 @@ VirtioRngGetRNG ( if (VirtioFlush (Dev->VirtIo, 0, &Dev->Ring, &Indices, &Len) !=3D EFI_SUCCESS) { Status =3D EFI_DEVICE_ERROR; + VirtioUnmapSharedBuffer (Dev->VirtIo, Mapping); goto FreeBuffer; } ASSERT (Len > 0); ASSERT (Len <=3D BufferSize); } =20 + VirtioUnmapSharedBuffer (Dev->VirtIo, Mapping); + for (Index =3D 0; Index < RNGValueLength; Index++) { RNGValue[Index] =3D Buffer[Index]; } Status =3D EFI_SUCCESS; =20 FreeBuffer: - FreePool ((VOID *)Buffer); + VirtioFreeSharedPages (Dev->VirtIo, NumPages, (VOID *)Buffer); return Status; } =20 @@ -281,6 +294,11 @@ VirtioRngInit ( goto Failed; } =20 + Status =3D VirtioRingMap (Dev->VirtIo, &Dev->Ring, &Dev->RingMap); + if (EFI_ERROR (Status)) { + goto ReleaseQueue; + } + // // Additional steps for MMIO: align the queue appropriately, and set the // size. If anything fails from here on, we must release the ring resour= ces. @@ -332,6 +350,11 @@ VirtioRngInit ( return EFI_SUCCESS; =20 ReleaseQueue: + if (Dev->RingMap !=3D NULL) { + VirtioRingUnmap (Dev->VirtIo, &Dev->Ring, Dev->RingMap); + Dev->RingMap =3D NULL; + } + VirtioRingUninit (Dev->VirtIo, &Dev->Ring); =20 Failed: @@ -359,6 +382,11 @@ VirtioRngUninit ( // the old comms area. // Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, 0); + + if (Dev->RingMap !=3D NULL) { + VirtioRingUnmap (Dev->VirtIo, &Dev->Ring, Dev->RingMap); + } + VirtioRingUninit (Dev->VirtIo, &Dev->Ring); } =20 @@ -385,6 +413,15 @@ VirtioRngExitBoot ( // Dev =3D Context; Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, 0); + + // + // If Ring mapping exist then umap it so that hypervisor will not able to + // get readable data after device reset. + // + if (Dev->RingMap !=3D NULL) { + VirtioRingUnmap (Dev->VirtIo, &Dev->Ring, Dev->RingMap); + Dev->RingMap =3D NULL; + } } =20 =20 --=20 2.7.4 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel