From: Brijesh Singh <brijesh.singh@amd.com>
To: edk2-devel@lists.01.org
Cc: Tom Lendacky <thomas.lendacky@amd.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Brijesh Singh <brijesh.singh@amd.com>,
Jordan Justen <jordan.l.justen@intel.com>,
Laszlo Ersek <lersek@redhat.com>
Subject: [PATCH v1 1/4] OvmfPkg: IommuDxe: Do not clear C-bit in Allocate() and Free()
Date: Mon, 31 Jul 2017 15:31:11 -0400 [thread overview]
Message-ID: <1501529474-20550-2-git-send-email-brijesh.singh@amd.com> (raw)
In-Reply-To: <1501529474-20550-1-git-send-email-brijesh.singh@amd.com>
As per the discussion [1], the buffer allocated using IOMMU->AllocateBuffer()
need not result in a buffer that is immediately usable for the
DMA device operation. Client is required to call Map() unconditionally
with BusMasterCommonBuffer before performing the desired DMA bus
master operation.
[1]https://lists.01.org/pipermail/edk2-devel/2017-July/012652.html
Suggested-by: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
OvmfPkg/IoMmuDxe/AmdSevIoMmu.c | 14 --------------
1 file changed, 14 deletions(-)
diff --git a/OvmfPkg/IoMmuDxe/AmdSevIoMmu.c b/OvmfPkg/IoMmuDxe/AmdSevIoMmu.c
index 9e78058b7242..cc3c979d4484 100644
--- a/OvmfPkg/IoMmuDxe/AmdSevIoMmu.c
+++ b/OvmfPkg/IoMmuDxe/AmdSevIoMmu.c
@@ -333,12 +333,6 @@ IoMmuAllocateBuffer (
);
if (!EFI_ERROR (Status)) {
*HostAddress = (VOID *) (UINTN) PhysicalAddress;
-
- //
- // Clear memory encryption mask
- //
- Status = MemEncryptSevClearPageEncMask (0, PhysicalAddress, Pages, TRUE);
- ASSERT_EFI_ERROR(Status);
}
DEBUG ((DEBUG_VERBOSE, "%a Address 0x%Lx Pages 0x%Lx\n", __FUNCTION__, PhysicalAddress, Pages));
@@ -365,14 +359,6 @@ IoMmuFreeBuffer (
IN VOID *HostAddress
)
{
- EFI_STATUS Status;
-
- //
- // Set memory encryption mask
- //
- Status = MemEncryptSevSetPageEncMask (0, (EFI_PHYSICAL_ADDRESS)(UINTN)HostAddress, Pages, TRUE);
- ASSERT_EFI_ERROR(Status);
-
DEBUG ((DEBUG_VERBOSE, "%a Address 0x%Lx Pages 0x%Lx\n", __FUNCTION__, (UINTN)HostAddress, Pages));
return gBS->FreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) HostAddress, Pages);
}
--
2.7.4
next prev parent reply other threads:[~2017-07-31 19:29 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-31 19:31 [PATCH v1 0/4] OvmfPkg : IoMmuDxe: BusMasterCommonBuffer support when SEV is active Brijesh Singh
2017-07-31 19:31 ` Brijesh Singh [this message]
2017-08-01 20:42 ` [PATCH v1 1/4] OvmfPkg: IommuDxe: Do not clear C-bit in Allocate() and Free() Laszlo Ersek
2017-07-31 19:31 ` [PATCH v1 2/4] OvmfPkg: IommuDxe: Provide support for mapping BusMasterCommonBuffer operation Brijesh Singh
2017-07-31 19:49 ` Ard Biesheuvel
2017-07-31 20:27 ` Brijesh Singh
2017-08-01 20:52 ` Laszlo Ersek
2017-08-01 21:59 ` Laszlo Ersek
2017-08-01 23:51 ` Brijesh Singh
2017-08-02 8:41 ` Laszlo Ersek
2017-07-31 19:31 ` [PATCH v1 3/4] OvmfPkg: IommuDxe: Zero the shared page(s) on Unmap() Brijesh Singh
2017-07-31 19:38 ` Brijesh Singh
2017-08-02 7:37 ` Laszlo Ersek
2017-08-02 11:22 ` Brijesh Singh
2017-08-02 12:52 ` Laszlo Ersek
2017-07-31 19:31 ` [PATCH v1 4/4] OvmfPkg : QemuFwCfgLib: Map DMA buffer with CommonBuffer when SEV is enable Brijesh Singh
2017-08-02 8:09 ` Laszlo Ersek
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