linux-kernel - Re: [PATCH v2] efi/arm: dump UEFI runtime page tables for ARM

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Date:   Mon, 10 Oct 2022 11:47:39 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-efi <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v2] efi/arm: dump UEFI runtime page tables for ARM

On Sat, 8 Oct 2022 at 08:37, Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
>
> Sorry, forget to Cc Ard and efi maillist, do it now.
>
> On 2022/9/30 18:10, Kefeng Wang wrote:
> > UEFI runtime page tables dump only for ARM64 at present,
> > but ARM support EFI and ARM_PTDUMP_DEBUGFS now. Since
> > ARM could potentially execute with a 1G/3G user/kernel
> > split, choosing 1G as the upper limit for UEFI runtime
> > end, with this, we could enable UEFI runtime page tables.
> >
> > Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> > ---
> > v2: update upper limit for ARM, only build test due to
> >      my qemu without UEFI boot support.

Tested-by: Ard Biesheuvel <ardb@...nel.org>
Acked-by: Ard Biesheuvel <ardb@...nel.org>




/ # cat /sys/kernel/debug/efi_page_tables
---[ UEFI runtime start ]---
0x20005000-0x20112000        1076K PTE KERNEL      RW NX SHD MEM/CACHED/WBWA
0x20112000-0x20114000           8K PTE KERNEL      ro x  SHD MEM/CACHED/WBWA
0x20114000-0x20117000          12K PTE KERNEL      RW NX SHD MEM/CACHED/WBWA
0x20117000-0x20118000           4K PTE KERNEL      ro x  SHD MEM/CACHED/WBWA
0x20118000-0x2011b000          12K PTE KERNEL      RW NX SHD MEM/CACHED/WBWA
0x2011b000-0x2011c000           4K PTE KERNEL      ro x  SHD MEM/CACHED/WBWA
0x2011c000-0x2011f000          12K PTE KERNEL      RW NX SHD MEM/CACHED/WBWA
0x2011f000-0x2017c000         372K PTE KERNEL      ro x  SHD MEM/CACHED/WBWA
0x2017c000-0x20183000          28K PTE KERNEL      RW NX SHD MEM/CACHED/WBWA
0x20183000-0x20186000          12K PTE KERNEL      ro x  SHD MEM/CACHED/WBWA
0x20186000-0x20189000          12K PTE KERNEL      RW NX SHD MEM/CACHED/WBWA
0x20189000-0x2018a000           4K PTE KERNEL      ro x  SHD MEM/CACHED/WBWA
0x2018a000-0x2018d000          12K PTE KERNEL      RW NX SHD MEM/CACHED/WBWA
0x2018d000-0x2018e000           4K PTE KERNEL      ro x  SHD MEM/CACHED/WBWA
0x2018e000-0x20191000          12K PTE KERNEL      RW NX SHD MEM/CACHED/WBWA
0x20191000-0x20193000           8K PTE KERNEL      ro x  SHD MEM/CACHED/WBWA
0x20193000-0x20195000           8K PTE KERNEL      RW NX SHD MEM/CACHED/WBWA
0x201a5000-0x203fd000        2400K PTE KERNEL      RW x  SHD MEM/CACHED/WBWA
0x20400000-0x24400000          64M PGD IO          RW NX SHD
0x24400000-0x24401000           4K PTE IO          RW NX SHD DEV/SHARED
---[ UEFI runtime end ]---

> >   arch/arm/include/asm/ptdump.h      | 1 +
> >   arch/arm64/include/asm/ptdump.h    | 1 +
> >   drivers/firmware/efi/arm-runtime.c | 4 ++--
> >   3 files changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm/include/asm/ptdump.h b/arch/arm/include/asm/ptdump.h
> > index 0c2d3d0d4cc6..aad1d034136c 100644
> > --- a/arch/arm/include/asm/ptdump.h
> > +++ b/arch/arm/include/asm/ptdump.h
> > @@ -21,6 +21,7 @@ struct ptdump_info {
> >
> >   void ptdump_walk_pgd(struct seq_file *s, struct ptdump_info *info);
> >   #ifdef CONFIG_ARM_PTDUMP_DEBUGFS
> > +#define EFI_RUNTIME_MAP_END  SZ_1G
> >   void ptdump_debugfs_register(struct ptdump_info *info, const char *name);
> >   #else
> >   static inline void ptdump_debugfs_register(struct ptdump_info *info,
> > diff --git a/arch/arm64/include/asm/ptdump.h b/arch/arm64/include/asm/ptdump.h
> > index b1dd7ecff7ef..581caac525b0 100644
> > --- a/arch/arm64/include/asm/ptdump.h
> > +++ b/arch/arm64/include/asm/ptdump.h
> > @@ -23,6 +23,7 @@ struct ptdump_info {
> >
> >   void ptdump_walk(struct seq_file *s, struct ptdump_info *info);
> >   #ifdef CONFIG_PTDUMP_DEBUGFS
> > +#define EFI_RUNTIME_MAP_END  DEFAULT_MAP_WINDOW_64
> >   void __init ptdump_debugfs_register(struct ptdump_info *info, const char *name);
> >   #else
> >   static inline void ptdump_debugfs_register(struct ptdump_info *info,
> > diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
> > index 3359ae2adf24..8f8ae479061b 100644
> > --- a/drivers/firmware/efi/arm-runtime.c
> > +++ b/drivers/firmware/efi/arm-runtime.c
> > @@ -25,14 +25,14 @@
> >   #include <asm/mmu.h>
> >   #include <asm/pgalloc.h>
> >
> > -#if defined(CONFIG_PTDUMP_DEBUGFS) && defined(CONFIG_ARM64)
> > +#if defined(CONFIG_PTDUMP_DEBUGFS) || defined(CONFIG_ARM_PTDUMP_DEBUGFS)
> >   #include <asm/ptdump.h>
> >
> >   static struct ptdump_info efi_ptdump_info = {
> >       .mm             = &efi_mm,
> >       .markers        = (struct addr_marker[]){
> >               { 0,                            "UEFI runtime start" },
> > -             { DEFAULT_MAP_WINDOW_64,        "UEFI runtime end" },
> > +             { EFI_RUNTIME_MAP_END,          "UEFI runtime end" },
> >               { -1,                           NULL }
> >       },
> >       .base_addr      = 0,