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Date: Fri, 5 Mar 2010 08:59:32 +0800
From: Shaohua Li <shaohua.li@...el.com>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: "H. Peter Anvin" <hpa@...or.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"mingo@...e.hu" <mingo@...e.hu>,
"colin.king@...onical.com" <colin.king@...onical.com>
Subject: Re: [PATCH] i386: do a global tlb flush in S4 resume
On Fri, Mar 05, 2010 at 03:49:46AM +0800, Rafael J. Wysocki wrote:
> On Thursday 04 March 2010, Shaohua Li wrote:
> > On Thu, Mar 04, 2010 at 10:30:02AM +0800, H. Peter Anvin wrote:
> > > On 03/03/2010 05:23 PM, Shaohua Li wrote:
> > > > Colin reported a strange oops in S4 resume code path (see below). The test
> > > > system has i5/i7 CPU. The kernel doesn't open PAE, so 4M page table is used.
> > > > The oops always happen a virtual address 0xc03ff000, which is mapped to the
> > > > last 4k of first 4M memory. Doing a global tlb flush fixes the issue.
> > > >
> > > > EIP: 0060:[<c0493a01>] EFLAGS: 00010086 CPU: 0
> > > > EIP is at copy_loop+0xe/0x15
> > > > EAX: 36aeb000 EBX: 00000000 ECX: 00000400 EDX: f55ad46c
> > > > ESI: 0f800000 EDI: c03ff000 EBP: f67fbec4 ESP: f67fbea8
> > > > DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> > > > ...
> > > > ...
> > > > CR2: 00000000c03ff000
> > > >
> > > > Tested-by: Colin Ian King <colin.king@...onical.com>
> > > > Signed-off-by: Shaohua Li <shaohua.li@...el.com>
> > > > ---
> > > > arch/x86/power/hibernate_asm_32.S | 11 +++++++++++
> > > > 1 files changed, 11 insertions(+), 0 deletions(-)
> > > >
> > > > diff --git a/arch/x86/power/hibernate_asm_32.S b/arch/x86/power/hibernate_asm_32.S
> > > > index b641388..9e4ef64 100644
> > > > --- a/arch/x86/power/hibernate_asm_32.S
> > > > +++ b/arch/x86/power/hibernate_asm_32.S
> > > > @@ -27,10 +27,21 @@ ENTRY(swsusp_arch_suspend)
> > > > ret
> > > >
> > > > ENTRY(restore_image)
> > > > + movl mmu_cr4_features, %ecx
> > > > movl resume_pg_dir, %eax
> > > > subl $__PAGE_OFFSET, %eax
> > > > movl %eax, %cr3
> > > >
> > > > + jecxz 1f # cr4 Pentium and higher, skip if zero
> > > > + movl %ecx, %edx
> > > > + andl $~(X86_CR4_PGE), %edx
> > > > + movl %edx, %cr4; # turn off PGE
> > > > +1:
> > > > + movl %cr3, %eax; # flush TLB
> > > > + movl %eax, %cr3
> > > > + jecxz 1f # cr4 Pentium and higher, skip if zero
> > > > + movl %ecx, %cr4; # turn PGE back on
> > > > +1:
> > > > movl restore_pblist, %edx
> > > > .p2align 4,,7
> > > >
> > >
> > > Since we're about to do another global page flush a bit further down in
> > > the same code, why not just leave PGE off until then?
> > sure, updated patch.
> >
> >
> > i386: do a global tlb flush in S4 resume
> >
> > Colin reported a strange oops in S4 resume code path (see below). The test
> > system has i5/i7 CPU. The kernel doesn't open PAE, so 4M page table is used.
> > The oops always happen a virtual address 0xc03ff000, which is mapped to the
> > last 4k of first 4M memory. Doing a global tlb flush fixes the issue.
> >
> > EIP: 0060:[<c0493a01>] EFLAGS: 00010086 CPU: 0
> > EIP is at copy_loop+0xe/0x15
> > EAX: 36aeb000 EBX: 00000000 ECX: 00000400 EDX: f55ad46c
> > ESI: 0f800000 EDI: c03ff000 EBP: f67fbec4 ESP: f67fbea8
> > DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> > ...
> > ...
> > CR2: 00000000c03ff000
> >
> > Tested-by: Colin Ian King <colin.king@...onical.com>
> > Signed-off-by: Shaohua Li <shaohua.li@...el.com>
> >
> > diff --git a/arch/x86/power/hibernate_asm_32.S b/arch/x86/power/hibernate_asm_32.S
> > index b641388..cd5e878 100644
> > --- a/arch/x86/power/hibernate_asm_32.S
> > +++ b/arch/x86/power/hibernate_asm_32.S
> > @@ -27,10 +27,17 @@ ENTRY(swsusp_arch_suspend)
> > ret
> >
> > ENTRY(restore_image)
> > + movl mmu_cr4_features, %ecx
> > movl resume_pg_dir, %eax
> > subl $__PAGE_OFFSET, %eax
> > movl %eax, %cr3
> >
> > + jecxz 1f # cr4 Pentium and higher, skip if zero
> > + andl $~(X86_CR4_PGE), %ecx
> > + movl %ecx, %cr4; # turn off PGE
> > + movl %cr3, %eax; # flush TLB
> > + movl %eax, %cr3
> > +1:
> > movl restore_pblist, %edx
> > .p2align 4,,7
>
> In that case please also remove the turning GPE off down the road.
i386: do a global tlb flush in S4 resume
Colin reported a strange oops in S4 resume code path (see below). The test
system has i5/i7 CPU. The kernel doesn't open PAE, so 4M page table is used.
The oops always happen a virtual address 0xc03ff000, which is mapped to the
last 4k of first 4M memory. Doing a global tlb flush fixes the issue.
EIP: 0060:[<c0493a01>] EFLAGS: 00010086 CPU: 0
EIP is at copy_loop+0xe/0x15
EAX: 36aeb000 EBX: 00000000 ECX: 00000400 EDX: f55ad46c
ESI: 0f800000 EDI: c03ff000 EBP: f67fbec4 ESP: f67fbea8
DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
...
...
CR2: 00000000c03ff000
Tested-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Shaohua Li <shaohua.li@...el.com>
diff --git a/arch/x86/power/hibernate_asm_32.S b/arch/x86/power/hibernate_asm_32.S
index b641388..ad47dae 100644
--- a/arch/x86/power/hibernate_asm_32.S
+++ b/arch/x86/power/hibernate_asm_32.S
@@ -27,10 +27,17 @@ ENTRY(swsusp_arch_suspend)
ret
ENTRY(restore_image)
+ movl mmu_cr4_features, %ecx
movl resume_pg_dir, %eax
subl $__PAGE_OFFSET, %eax
movl %eax, %cr3
+ jecxz 1f # cr4 Pentium and higher, skip if zero
+ andl $~(X86_CR4_PGE), %ecx
+ movl %ecx, %cr4; # turn off PGE
+ movl %cr3, %eax; # flush TLB
+ movl %eax, %cr3
+1:
movl restore_pblist, %edx
.p2align 4,,7
@@ -54,16 +61,8 @@ done:
movl $swapper_pg_dir, %eax
subl $__PAGE_OFFSET, %eax
movl %eax, %cr3
- /* Flush TLB, including "global" things (vmalloc) */
movl mmu_cr4_features, %ecx
jecxz 1f # cr4 Pentium and higher, skip if zero
- movl %ecx, %edx
- andl $~(X86_CR4_PGE), %edx
- movl %edx, %cr4; # turn off PGE
-1:
- movl %cr3, %eax; # flush TLB
- movl %eax, %cr3
- jecxz 1f # cr4 Pentium and higher, skip if zero
movl %ecx, %cr4; # turn PGE back on
1:
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