UefiCpuPkg/CpuDxe/CpuPageTable.c | 48 +++++++++++++++++++++++++++++++--------- 1 file changed, 38 insertions(+), 10 deletions(-)
> v3:
> a. Add comment to explain more on updating memory capabilities
> b. Fix logic hole in updating attributes
> c. Instead of checking illegal memory space address and size, use return
> status of gDS->SetMemorySpaceCapabilities() to skip memory block which
> cannot be updated with new capabilities.
> 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.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
---
UefiCpuPkg/CpuDxe/CpuPageTable.c | 48 +++++++++++++++++++++++++++++++---------
1 file changed, 38 insertions(+), 10 deletions(-)
diff --git a/UefiCpuPkg/CpuDxe/CpuPageTable.c b/UefiCpuPkg/CpuDxe/CpuPageTable.c
index d312eb66f8..455c713dfc 100644
--- a/UefiCpuPkg/CpuDxe/CpuPageTable.c
+++ b/UefiCpuPkg/CpuDxe/CpuPageTable.c
@@ -789,7 +789,6 @@ RefreshGcdMemoryAttributesFromPaging (
UINT64 BaseAddress;
UINT64 PageStartAddress;
UINT64 Attributes;
- UINT64 Capabilities;
BOOLEAN DoUpdate;
UINTN Index;
@@ -803,7 +802,6 @@ RefreshGcdMemoryAttributesFromPaging (
GetCurrentPagingContext (&PagingContext);
DoUpdate = FALSE;
- Capabilities = 0;
Attributes = 0;
BaseAddress = 0;
PageLength = 0;
@@ -813,6 +811,27 @@ RefreshGcdMemoryAttributesFromPaging (
continue;
}
+ //
+ // Sync the actual paging related capabilities back to GCD service first.
+ // As a side effect (good one), this can also help to avoid unnecessary
+ // memory map entries due to the different capabilities of the same type
+ // memory, such as multiple RT_CODE and RT_DATA entries in memory map,
+ // which could cause boot failure of some old Linux distro (before v4.3).
+ //
+ Status = gDS->SetMemorySpaceCapabilities (
+ MemorySpaceMap[Index].BaseAddress,
+ MemorySpaceMap[Index].Length,
+ MemorySpaceMap[Index].Capabilities |
+ EFI_MEMORY_PAGETYPE_MASK
+ );
+ if (EFI_ERROR (Status)) {
+ //
+ // If we cannot udpate the capabilities, we cannot update its
+ // attributes either. So just simply skip current block of memory.
+ //
+ continue;
+ }
+
if (MemorySpaceMap[Index].BaseAddress >= (BaseAddress + PageLength)) {
//
// Current memory space starts at a new page. Resetting PageLength will
@@ -826,7 +845,9 @@ RefreshGcdMemoryAttributesFromPaging (
PageLength -= (MemorySpaceMap[Index].BaseAddress - BaseAddress);
}
- // Sync real page attributes to GCD
+ //
+ // Sync actual page attributes to GCD
+ //
BaseAddress = MemorySpaceMap[Index].BaseAddress;
MemorySpaceLength = MemorySpaceMap[Index].Length;
while (MemorySpaceLength > 0) {
@@ -845,8 +866,6 @@ 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;
}
@@ -854,11 +873,20 @@ RefreshGcdMemoryAttributesFromPaging (
Length = MIN (PageLength, MemorySpaceLength);
if (DoUpdate) {
- gDS->SetMemorySpaceCapabilities (BaseAddress, Length, Capabilities);
- gDS->SetMemorySpaceAttributes (BaseAddress, Length, Attributes);
- DEBUG ((DEBUG_INFO, "Update memory space attribute: [%02d] %016lx - %016lx (%08lx -> %08lx)\r\n",
- Index, BaseAddress, BaseAddress + Length - 1,
- MemorySpaceMap[Index].Attributes, Attributes));
+ Status = gDS->SetMemorySpaceAttributes (
+ BaseAddress,
+ Length,
+ (MemorySpaceMap[Index].Attributes
+ & ~EFI_MEMORY_PAGETYPE_MASK) | Attributes
+ );
+ ASSERT_EFI_ERROR (Status);
+ DEBUG ((
+ DEBUG_INFO,
+ "Update memory space attribute: [%02d] %016lx - %016lx (%016lx -> %016lx)\r\n",
+ Index, BaseAddress, BaseAddress + Length - 1,
+ MemorySpaceMap[Index].Attributes,
+ (MemorySpaceMap[Index].Attributes & ~EFI_MEMORY_PAGETYPE_MASK) | Attributes
+ ));
}
PageLength -= Length;
--
2.14.1.windows.1
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On 11/08/17 11:52, Jian J Wang wrote:
>> v3:
>> a. Add comment to explain more on updating memory capabilities
>> b. Fix logic hole in updating attributes
>> c. Instead of checking illegal memory space address and size, use return
>> status of gDS->SetMemorySpaceCapabilities() to skip memory block which
>> cannot be updated with new capabilities.
>
>> 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.dong@intel.com>
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
> ---
> UefiCpuPkg/CpuDxe/CpuPageTable.c | 48 +++++++++++++++++++++++++++++++---------
> 1 file changed, 38 insertions(+), 10 deletions(-)
>
> diff --git a/UefiCpuPkg/CpuDxe/CpuPageTable.c b/UefiCpuPkg/CpuDxe/CpuPageTable.c
> index d312eb66f8..455c713dfc 100644
> --- a/UefiCpuPkg/CpuDxe/CpuPageTable.c
> +++ b/UefiCpuPkg/CpuDxe/CpuPageTable.c
> @@ -789,7 +789,6 @@ RefreshGcdMemoryAttributesFromPaging (
> UINT64 BaseAddress;
> UINT64 PageStartAddress;
> UINT64 Attributes;
> - UINT64 Capabilities;
> BOOLEAN DoUpdate;
> UINTN Index;
>
> @@ -803,7 +802,6 @@ RefreshGcdMemoryAttributesFromPaging (
> GetCurrentPagingContext (&PagingContext);
>
> DoUpdate = FALSE;
> - Capabilities = 0;
> Attributes = 0;
> BaseAddress = 0;
> PageLength = 0;
> @@ -813,6 +811,27 @@ RefreshGcdMemoryAttributesFromPaging (
> continue;
> }
>
> + //
> + // Sync the actual paging related capabilities back to GCD service first.
> + // As a side effect (good one), this can also help to avoid unnecessary
> + // memory map entries due to the different capabilities of the same type
> + // memory, such as multiple RT_CODE and RT_DATA entries in memory map,
> + // which could cause boot failure of some old Linux distro (before v4.3).
> + //
> + Status = gDS->SetMemorySpaceCapabilities (
> + MemorySpaceMap[Index].BaseAddress,
> + MemorySpaceMap[Index].Length,
> + MemorySpaceMap[Index].Capabilities |
> + EFI_MEMORY_PAGETYPE_MASK
> + );
> + if (EFI_ERROR (Status)) {
> + //
> + // If we cannot udpate the capabilities, we cannot update its
> + // attributes either. So just simply skip current block of memory.
> + //
(1) Can you perhaps add a DEBUG_WARN here?
> + continue;
> + }
> +
> if (MemorySpaceMap[Index].BaseAddress >= (BaseAddress + PageLength)) {
> //
> // Current memory space starts at a new page. Resetting PageLength will
> @@ -826,7 +845,9 @@ RefreshGcdMemoryAttributesFromPaging (
> PageLength -= (MemorySpaceMap[Index].BaseAddress - BaseAddress);
> }
>
> - // Sync real page attributes to GCD
> + //
> + // Sync actual page attributes to GCD
> + //
> BaseAddress = MemorySpaceMap[Index].BaseAddress;
> MemorySpaceLength = MemorySpaceMap[Index].Length;
> while (MemorySpaceLength > 0) {
> @@ -845,8 +866,6 @@ 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;
> }
(2) To me it seems like we can remove the "DoUpdate" local variable
completely. Below, we can replace the DoUpdate check with the actual
(Attributes != (MemorySpaceMap[Index].Attributes &
EFI_MEMORY_PAGETYPE_MASK))
check.
The point is that we check the EFI_MEMORY_PAGETYPE_MASK bit-field of the
entry's attributes. If they do not match Attributes, we clear the full
bit-field, and then add Attributes back in. I.e., we set the bit-field
to the desired Attributes.
> @@ -854,11 +873,20 @@ RefreshGcdMemoryAttributesFromPaging (
>
> Length = MIN (PageLength, MemorySpaceLength);
> if (DoUpdate) {
> - gDS->SetMemorySpaceCapabilities (BaseAddress, Length, Capabilities);
> - gDS->SetMemorySpaceAttributes (BaseAddress, Length, Attributes);
> - DEBUG ((DEBUG_INFO, "Update memory space attribute: [%02d] %016lx - %016lx (%08lx -> %08lx)\r\n",
> - Index, BaseAddress, BaseAddress + Length - 1,
> - MemorySpaceMap[Index].Attributes, Attributes));
> + Status = gDS->SetMemorySpaceAttributes (
> + BaseAddress,
> + Length,
> + (MemorySpaceMap[Index].Attributes
> + & ~EFI_MEMORY_PAGETYPE_MASK) | Attributes
> + );
> + ASSERT_EFI_ERROR (Status);
> + DEBUG ((
> + DEBUG_INFO,
> + "Update memory space attribute: [%02d] %016lx - %016lx (%016lx -> %016lx)\r\n",
> + Index, BaseAddress, BaseAddress + Length - 1,
> + MemorySpaceMap[Index].Attributes,
> + (MemorySpaceMap[Index].Attributes & ~EFI_MEMORY_PAGETYPE_MASK) | Attributes
> + ));
> }
(3) I suggest introducing a new variable called
"NewMemorySpaceAttributes", and using that for both the debug message
and the SetMemorySpaceAttributes() call.
(4) Not closely related to this patch, but I'll mention it: the "%d"
format specifier is not right for printing UINTN values. The
32-bit/64-bit clean way to print UINTN is:
- cast the variable to UINT64 explicitly,
- print it with "%lu".
Thanks!
Laszlo
>
> PageLength -= Length;
>
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Hi Laszlo,
> -----Original Message-----
> From: Laszlo Ersek [mailto:lersek@redhat.com]
> Sent: Wednesday, November 08, 2017 10:37 PM
> To: Wang, Jian J <jian.j.wang@intel.com>; edk2-devel@lists.01.org
> Cc: Dong, Eric <eric.dong@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>
> Subject: Re: [PATCH v3] UefiCpuPkg/CpuDxe: Fix multiple entries of RT_CODE in
> memory map
>
> On 11/08/17 11:52, Jian J Wang wrote:
> >> v3:
> >> a. Add comment to explain more on updating memory capabilities
> >> b. Fix logic hole in updating attributes
> >> c. Instead of checking illegal memory space address and size, use return
> >> status of gDS->SetMemorySpaceCapabilities() to skip memory block which
> >> cannot be updated with new capabilities.
> >
> >> 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.dong@intel.com>
> > Cc: Jiewen Yao <jiewen.yao@intel.com>
> > Cc: Laszlo Ersek <lersek@redhat.com>
> > Contributed-under: TianoCore Contribution Agreement 1.1
> > Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
> > ---
> > UefiCpuPkg/CpuDxe/CpuPageTable.c | 48
> +++++++++++++++++++++++++++++++---------
> > 1 file changed, 38 insertions(+), 10 deletions(-)
> >
> > diff --git a/UefiCpuPkg/CpuDxe/CpuPageTable.c
> b/UefiCpuPkg/CpuDxe/CpuPageTable.c
> > index d312eb66f8..455c713dfc 100644
> > --- a/UefiCpuPkg/CpuDxe/CpuPageTable.c
> > +++ b/UefiCpuPkg/CpuDxe/CpuPageTable.c
> > @@ -789,7 +789,6 @@ RefreshGcdMemoryAttributesFromPaging (
> > UINT64 BaseAddress;
> > UINT64 PageStartAddress;
> > UINT64 Attributes;
> > - UINT64 Capabilities;
> > BOOLEAN DoUpdate;
> > UINTN Index;
> >
> > @@ -803,7 +802,6 @@ RefreshGcdMemoryAttributesFromPaging (
> > GetCurrentPagingContext (&PagingContext);
> >
> > DoUpdate = FALSE;
> > - Capabilities = 0;
> > Attributes = 0;
> > BaseAddress = 0;
> > PageLength = 0;
> > @@ -813,6 +811,27 @@ RefreshGcdMemoryAttributesFromPaging (
> > continue;
> > }
> >
> > + //
> > + // Sync the actual paging related capabilities back to GCD service first.
> > + // As a side effect (good one), this can also help to avoid unnecessary
> > + // memory map entries due to the different capabilities of the same type
> > + // memory, such as multiple RT_CODE and RT_DATA entries in memory
> map,
> > + // which could cause boot failure of some old Linux distro (before v4.3).
> > + //
> > + Status = gDS->SetMemorySpaceCapabilities (
> > + MemorySpaceMap[Index].BaseAddress,
> > + MemorySpaceMap[Index].Length,
> > + MemorySpaceMap[Index].Capabilities |
> > + EFI_MEMORY_PAGETYPE_MASK
> > + );
> > + if (EFI_ERROR (Status)) {
> > + //
> > + // If we cannot udpate the capabilities, we cannot update its
> > + // attributes either. So just simply skip current block of memory.
> > + //
>
> (1) Can you perhaps add a DEBUG_WARN here?
Sure.
>
> > + continue;
> > + }
> > +
> > if (MemorySpaceMap[Index].BaseAddress >= (BaseAddress + PageLength)) {
> > //
> > // Current memory space starts at a new page. Resetting PageLength will
> > @@ -826,7 +845,9 @@ RefreshGcdMemoryAttributesFromPaging (
> > PageLength -= (MemorySpaceMap[Index].BaseAddress - BaseAddress);
> > }
> >
> > - // Sync real page attributes to GCD
> > + //
> > + // Sync actual page attributes to GCD
> > + //
> > BaseAddress = MemorySpaceMap[Index].BaseAddress;
> > MemorySpaceLength = MemorySpaceMap[Index].Length;
> > while (MemorySpaceLength > 0) {
> > @@ -845,8 +866,6 @@ 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;
> > }
>
> (2) To me it seems like we can remove the "DoUpdate" local variable
> completely. Below, we can replace the DoUpdate check with the actual
>
> (Attributes != (MemorySpaceMap[Index].Attributes &
> EFI_MEMORY_PAGETYPE_MASK))
>
> check.
>
> The point is that we check the EFI_MEMORY_PAGETYPE_MASK bit-field of the
> entry's attributes. If they do not match Attributes, we clear the full
> bit-field, and then add Attributes back in. I.e., we set the bit-field
> to the desired Attributes.
>
You're right. Checking the attribute mismatch inside the "if (PageLength == 0)"
still leaves a logic hole there. You suggestion can fix it. Thanks for this catch.
> > @@ -854,11 +873,20 @@ RefreshGcdMemoryAttributesFromPaging (
> >
> > Length = MIN (PageLength, MemorySpaceLength);
> > if (DoUpdate) {
> > - gDS->SetMemorySpaceCapabilities (BaseAddress, Length, Capabilities);
> > - gDS->SetMemorySpaceAttributes (BaseAddress, Length, Attributes);
> > - DEBUG ((DEBUG_INFO, "Update memory space attribute: [%02d] %016lx
> - %016lx (%08lx -> %08lx)\r\n",
> > - Index, BaseAddress, BaseAddress + Length - 1,
> > - MemorySpaceMap[Index].Attributes, Attributes));
> > + Status = gDS->SetMemorySpaceAttributes (
> > + BaseAddress,
> > + Length,
> > + (MemorySpaceMap[Index].Attributes
> > + & ~EFI_MEMORY_PAGETYPE_MASK) | Attributes
> > + );
> > + ASSERT_EFI_ERROR (Status);
> > + DEBUG ((
> > + DEBUG_INFO,
> > + "Update memory space attribute: [%02d] %016lx - %016lx (%016lx -
> > %016lx)\r\n",
> > + Index, BaseAddress, BaseAddress + Length - 1,
> > + MemorySpaceMap[Index].Attributes,
> > + (MemorySpaceMap[Index].Attributes &
> ~EFI_MEMORY_PAGETYPE_MASK) | Attributes
> > + ));
> > }
>
> (3) I suggest introducing a new variable called
> "NewMemorySpaceAttributes", and using that for both the debug message
> and the SetMemorySpaceAttributes() call.
>
I agree.
> (4) Not closely related to this patch, but I'll mention it: the "%d"
> format specifier is not right for printing UINTN values. The
> 32-bit/64-bit clean way to print UINTN is:
>
> - cast the variable to UINT64 explicitly,
> - print it with "%lu".
>
Thanks for pointing this out.
> Thanks!
> Laszlo
>
> >
> > PageLength -= Length;
> >
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