[edk2-devel] [PATCH v3 0/3] SEV Page Encryption Bitmap support for OVMF.
Laszlo Ersek
lersek at redhat.com
Fri Dec 4 03:50:05 UTC 2020
On 12/04/20 01:03, Ashish Kalra wrote:
> From: Ashish Kalra <ashish.kalra at amd.com>
>
> By default all the SEV guest memory regions are considered encrypted,
> if a guest changes the encryption attribute of the page (e.g mark a
> page as decrypted) then notify hypervisor. Hypervisor will need to
> track the unencrypted pages. The information will be used during
> guest live migration, guest page migration and guest debugging.
>
> The patch-set also adds a new SEV and SEV-ES hypercall abstraction
> library to support SEV Page encryption/decryption status hypercalls
> for SEV and SEV-ES guests.
>
> BaseMemEncryptSevLib invokes hypercalls via this new hypercall library.
>
> A branch containing these patches is available here:
> https://github.com/ashkalra/edk2/tree/sev_page_encryption_bitmap_v3
>
> Changes since v2:
> - GHCB_BASE setup during reset-vector as decrypted is marked explicitly
> in the hypervisor page encryption bitmap after setting the
> PcdSevEsIsEnabled PCD.
>
> Changes since v1:
> - Mark GHCB_BASE setup during reset-vector as decrypted explicitly in
> the hypervisor page encryption bitmap.
> - Resending the series with correct shallow threading.
>
> Ashish Kalra (2):
> OvmfPkg/MemEncryptHypercallLib: add library to support SEV hypercalls.
> OvmfPkg/PlatformPei: Mark SEC GHCB page in the page encrpytion bitmap.
>
> Brijesh Singh (1):
> OvmfPkg/BaseMemEncryptLib: Support to issue unencrypted hypercall
>
> .../Include/Library/MemEncryptHypercallLib.h | 37 ++++++
> .../BaseMemEncryptSevLib.inf | 1 +
> .../BaseMemEncryptSevLib/X64/VirtualMemory.c | 18 +++
> .../MemEncryptHypercallLib.c | 105 ++++++++++++++++++
> .../MemEncryptHypercallLib.inf | 39 +++++++
> .../X64/AsmHelperStub.nasm | 39 +++++++
> OvmfPkg/OvmfPkgX64.dsc | 1 +
> OvmfPkg/PlatformPei/AmdSev.c | 10 ++
> 8 files changed, 250 insertions(+)
> create mode 100644 OvmfPkg/Include/Library/MemEncryptHypercallLib.h
> create mode 100644 OvmfPkg/Library/MemEncryptHypercallLib/MemEncryptHypercallLib.c
> create mode 100644 OvmfPkg/Library/MemEncryptHypercallLib/MemEncryptHypercallLib.inf
> create mode 100644 OvmfPkg/Library/MemEncryptHypercallLib/X64/AsmHelperStub.nasm
>
I'll need some time to get to this series.
I'm fairly certain though, from a quick skim, that this series breaks
all DSC files under OvmfPkg except X64. Please fix that.
Thanks
Laszlo
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