[edk2-devel] [PATCH v5 3/4] OvmfPkg/PlatformPei: Mark SEC GHCB page as unencrypted via hypercall
Ashish Kalra via groups.io
ashish.kalra=amd.com at groups.io
Mon Jul 19 20:27:11 UTC 2021
Hello Tom,
On Fri, Jul 16, 2021 at 09:22:20AM -0500, Tom Lendacky wrote:
> On 7/8/21 9:08 AM, Ashish Kalra wrote:
> > From: Ashish Kalra <ashish.kalra at amd.com>
> >
> > Mark the SEC GHCB page (that is mapped as unencrypted in
> > ResetVector code) in the hypervisor page status tracking.
> >
> > Cc: Jordan Justen <jordan.l.justen at intel.com>
> > Cc: Laszlo Ersek <lersek at redhat.com>
> > Cc: Ard Biesheuvel <ard.biesheuvel at arm.com>
> > Signed-off-by: Ashish Kalra <ashish.kalra at amd.com>
> > ---
> > OvmfPkg/PlatformPei/AmdSev.c | 9 +++++++++
> > 1 file changed, 9 insertions(+)
> >
> > diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
> > index a8bf610022..1ec0de48fe 100644
> > --- a/OvmfPkg/PlatformPei/AmdSev.c
> > +++ b/OvmfPkg/PlatformPei/AmdSev.c
> > @@ -52,6 +52,15 @@ AmdSevEsInitialize (
> > PcdStatus = PcdSetBoolS (PcdSevEsIsEnabled, TRUE);
> > ASSERT_RETURN_ERROR (PcdStatus);
> >
> > + //
> > + // GHCB_BASE setup during reset-vector needs to be marked as
>
> s/GHCB_BASE/The SEC Ghcb/
>
> > + // decrypted in the hypervisor page encryption bitmap.
>
> Is the "hypervisor page encryption bitmap" valid anymore? This gets passed
> up to userspace now, right?
>
> You should go through all the patches to be sure you aren't talking about
> a bitmap anymore and just state that you're updating the encryption state
> with the hypervisor.
>
Ok, i will fix that.
> > + //
> > + SetMemoryEncDecHypercall3 (FixedPcdGet32 (PcdOvmfSecGhcbBase),
>
> The first argument needs to be moved down to a line of its own and
> indented like the following arguments.
>
> > + EFI_SIZE_TO_PAGES(FixedPcdGet32 (PcdOvmfSecGhcbSize)),
> > + KVM_MAP_GPA_RANGE_DECRYPTED
>
> Ah, now I see this #define used, but you should be passing a 0 or 1,
> right? This happens to evaluate to 0, but it's the wrong way to call this
> function.
>
Ok.
Thanks,
Ashish
> > + );
> > +
> > //
> > // Allocate GHCB and per-CPU variable pages.
> > // Since the pages must survive across the UEFI to OS transition
> >
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#77927): https://edk2.groups.io/g/devel/message/77927
Mute This Topic: https://groups.io/mt/84068365/1813853
Group Owner: devel+owner at edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [edk2-devel-archive at redhat.com]
-=-=-=-=-=-=-=-=-=-=-=-
More information about the edk2-devel-archive
mailing list