On 08/07/20 23:53, Lendacky, Thomas wrote: > From: Tom Lendacky <thomas.lenda...@amd.com> > > BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198 > > Before UEFI transfers control to the OS, it must park the AP. This is > done using the AsmRelocateApLoop function to transition into 32-bit > non-paging mode. For an SEV-ES guest, a few additional things must be > done: > - AsmRelocateApLoop must be updated to support SEV-ES. This means > performing a VMGEXIT AP Reset Hold instead of an MWAIT or HLT loop. > - Since the AP must transition to real mode, a small routine is copied > to the WakeupBuffer area. Since the WakeupBuffer will be used by > the AP during OS booting, it must be placed in reserved memory. > Additionally, the AP stack must be located where it can be accessed > in real mode. > - Once the AP is in real mode it will transfer control to the > destination specified by the OS in the SEV-ES AP Jump Table. The > SEV-ES AP Jump Table address is saved by the hypervisor for the OS > using the GHCB VMGEXIT AP Jump Table exit code. > > Cc: Eric Dong <eric.d...@intel.com> > Cc: Ray Ni <ray...@intel.com> > Cc: Laszlo Ersek <ler...@redhat.com> > Reviewed-by: Eric Dong <eric.d...@intel.com> > Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com> > --- > UefiCpuPkg/Library/MpInitLib/MpLib.h | 8 +- > UefiCpuPkg/Library/MpInitLib/DxeMpLib.c | 54 +++++++- > .../Library/MpInitLib/Ia32/MpFuncs.nasm | 5 +- > UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm | 130 ++++++++++++++++-- > 4 files changed, 179 insertions(+), 18 deletions(-)
this patch is indeed the v13 variant with the incremental fix that I had tested squashed in it. Thanks! Laszlo -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#63919): https://edk2.groups.io/g/devel/message/63919 Mute This Topic: https://groups.io/mt/76058847/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
