Hi Laszlo,
> -----Original Message-----
> From: Laszlo Ersek [mailto:ler...@redhat.com]
> Sent: Wednesday, November 08, 2017 1:14 AM
> To: Wang, Jian J <jian.j.w...@intel.com>; edk2-devel@lists.01.org
> Cc: Yao, Jiewen <jiewen....@intel.com>; Dong, Eric <eric.d...@intel.com>
> Subject: Re: [edk2] [PATCH v2] UefiCpuPkg/CpuDxe: Fix multiple entries of
> RT_CODE in memory map
>
> sorry about the late response
>
> On 11/03/17 01:57, Jian J Wang wrote:
> >> v2
> >> a. Fix an issue which will cause setting capability failure if size is
> >> smaller
> >> than a page.
> >
> > More than one entry of RT_CODE memory might cause boot problem for
> some
> > old OSs. This patch will fix this issue to keep OS compatibility as much
> > as possible.
> >
> > More detailed information, please refer to
> > https://bugzilla.tianocore.org/show_bug.cgi?id=753
> >
> > Cc: Eric Dong <eric.d...@intel.com>
> > Cc: Jiewen Yao <jiewen....@intel.com>
> > Cc: Laszlo Ersek <ler...@redhat.com>
> > Contributed-under: TianoCore Contribution Agreement 1.1
> > Signed-off-by: Jian J Wang <jian.j.w...@intel.com>
> > ---
> > UefiCpuPkg/CpuDxe/CpuPageTable.c | 18 ++++++++++++++----
> > 1 file changed, 14 insertions(+), 4 deletions(-)
> >
> > diff --git a/UefiCpuPkg/CpuDxe/CpuPageTable.c
> b/UefiCpuPkg/CpuDxe/CpuPageTable.c
> > index d312eb66f8..4a7827ebc9 100644
> > --- a/UefiCpuPkg/CpuDxe/CpuPageTable.c
> > +++ b/UefiCpuPkg/CpuDxe/CpuPageTable.c
> > @@ -809,7 +809,9 @@ RefreshGcdMemoryAttributesFromPaging (
> > PageLength = 0;
> >
> > for (Index = 0; Index < NumberOfDescriptors; Index++) {
> > - if (MemorySpaceMap[Index].GcdMemoryType ==
> EfiGcdMemoryTypeNonExistent) {
> > + if (MemorySpaceMap[Index].GcdMemoryType ==
> EfiGcdMemoryTypeNonExistent
> > + || (MemorySpaceMap[Index].BaseAddress & EFI_PAGE_MASK) != 0
> > + || (MemorySpaceMap[Index].Length & EFI_PAGE_MASK) != 0) {
> > continue;
> > }
>
> When exactly do the new conditions match?
>
> I thought the base addresses and the lengths in the GCD memory space map
> are all page aligned. Is that not the case?
>
> If these conditions are just a sanity check (i.e. we never expect them
> to fire), then should we perpahs turn them into ASSERT()s?
>
I found that there's a mmio entry in memory map on OVMF which has size
less than a page. I didn't encounter this before. Maybe some recent changes
in other part of EDKII caused this situation. So ASSERT is not enough.
> >
> > @@ -829,6 +831,15 @@ RefreshGcdMemoryAttributesFromPaging (
> > // Sync real page attributes to GCD
> > BaseAddress = MemorySpaceMap[Index].BaseAddress;
> > MemorySpaceLength = MemorySpaceMap[Index].Length;
> > + Capabilities = MemorySpaceMap[Index].Capabilities |
> > + EFI_MEMORY_PAGETYPE_MASK;
> > + Status = gDS->SetMemorySpaceCapabilities (
> > + BaseAddress,
> > + MemorySpaceLength,
> > + Capabilities
> > + );
> > + ASSERT_EFI_ERROR (Status);
> > +
>
> OK, so I guess we simply add EFI_MEMORY_PAGETYPE_MASK to the
> capabilities of all memory space map entries that have a type different
> from non-existent. We discussed it before and (apparently) it is
> considered safe.
>
Yes. I've validated different OSs boot. It's safe to stay this way.
> > while (MemorySpaceLength > 0) {
> > if (PageLength == 0) {
> > PageEntry = GetPageTableEntry (&PagingContext, BaseAddress,
> &PageAttribute);
> > @@ -846,7 +857,6 @@ RefreshGcdMemoryAttributesFromPaging (
> > if (Attributes != (MemorySpaceMap[Index].Attributes &
> EFI_MEMORY_PAGETYPE_MASK)) {
> > DoUpdate = TRUE;
> > Attributes |= (MemorySpaceMap[Index].Attributes &
> ~EFI_MEMORY_PAGETYPE_MASK);
> > - Capabilities = Attributes | MemorySpaceMap[Index].Capabilities;
> > } else {
> > DoUpdate = FALSE;
> > }
> > @@ -854,8 +864,8 @@ RefreshGcdMemoryAttributesFromPaging (
> >
> > Length = MIN (PageLength, MemorySpaceLength);
> > if (DoUpdate) {
> > - gDS->SetMemorySpaceCapabilities (BaseAddress, Length,
> > Capabilities);
> > - gDS->SetMemorySpaceAttributes (BaseAddress, Length, Attributes);
> > + Status = gDS->SetMemorySpaceAttributes (BaseAddress, Length,
> Attributes);
> > + ASSERT_EFI_ERROR (Status);
> > DEBUG ((DEBUG_INFO, "Update memory space attribute: [%02d] %016lx
> - %016lx (%08lx -> %08lx)\r\n",
> > Index, BaseAddress, BaseAddress + Length - 1,
> > MemorySpaceMap[Index].Attributes,
> > Attributes));
> >
>
> I'll let you decide about the EFI_PAGE_MASK conditions near the top.
>
> Acked-by: Laszlo Ersek <ler...@redhat.com>
>
Thanks.
> Thanks
> Laszlo
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