[edk2-devel] [PATCH v3 0/3] SEV Page Encryption Bitmap support for OVMF.
Ashish Kalra
ashish.kalra at amd.com
Fri Dec 4 08:10:09 UTC 2020
On Fri, Dec 04, 2020 at 04:50:05AM +0100, Laszlo Ersek wrote:
> 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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fashkalra%2Fedk2%2Ftree%2Fsev_page_encryption_bitmap_v3&data=04%7C01%7Cashish.kalra%40amd.com%7Cbc3c88f21f1d40b322b408d89807b5c8%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637426506192800828%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=VZzP2MVJSECgMhOyuCCASw58g74BiCVAH9JW8hZG3Tw%3D&reserved=0
> >
> > 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.
>
>
Ok thanks Laszlo, i will fix this.
Ashish
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