On Fri, Mar 08, 2024 at 07:31:11AM -0800, Lendacky, Thomas via groups.io wrote: > BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654 > > In preparation for running under an SVSM at VMPL1 or higher (higher > numerically, lower privilege), re-organize the way a page state change > is performed in order to free up the GHCB for use by the SVSM support. > > Currently, the page state change logic directly uses the GHCB shared > buffer to build the page state change structures. However, this will be > in conflict with the use of the GHCB should an SVSM call be required. > > Instead, use a separate buffer (an area in the workarea during SEC and > an allocated page during PEI/DXE) to hold the page state change request > and only update the GHCB shared buffer as needed. > > Since the information is copied to, and operated on, in the GHCB shared > buffer this has the added benefit of not requiring to save the start and > end entries for use when validating the memory during the page state > change sequence. > > Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org> > Cc: Erdem Aktas <erdemak...@google.com> > Cc: Gerd Hoffmann <kra...@redhat.com> > Cc: Jiewen Yao <jiewen....@intel.com> > Cc: Laszlo Ersek <ler...@redhat.com> > Cc: Michael Roth <michael.r...@amd.com> > Cc: Min Xu <min.m...@intel.com> > Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com>
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