On 11/07/18 09:59, Ruiyu Ni wrote: > From: Jiewen Yao <[email protected]> > > When static paging is disabled, page table for below 4GB is created > and page table for above 4GB is created dynamically in page fault > handler. > > Today's implementation only allow SMM access-out to below types of > memory address no matter static paging is enabled or not: > 1. Reserved, run time and ACPI NVS type > 2. MMIO > > But certain platform feature like RAS may need to access other types > of memory from SMM. Today's code blocks these platforms. > This patch simplifies the policy to only block when static paging > is used so that the static paging can be disabled in these platforms > to meet their SMM access-out need. > > Setting PcdCpuSmmStaticPageTable to FALSE can disable the static > paging. > > Contributed-under: TianoCore Contribution Agreement 1.1 > Signed-off-by: Jiewen Yao <[email protected]> > Signed-off-by: Ruiyu Ni <[email protected]> > Cc: Eric Dong <[email protected]> > Cc: Jiewen Yao <[email protected]> > Acked-by: Laszlo Ersek <[email protected]> > --- > UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-)
Thanks, this has improved a lot! Laszlo _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
