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Date: Fri, 10 Jun 2022 20:15:17 +0800 From: Kefeng Wang <wangkefeng.wang@...wei.com> To: Ard Biesheuvel <ardb@...nel.org>, Wupeng Ma <mawupeng1@...wei.com> CC: Jonathan Corbet <corbet@....net>, Will Deacon <will@...nel.org>, "Catalin Marinas" <catalin.marinas@....com>, Thomas Gleixner <tglx@...utronix.de>, "Ingo Molnar" <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Darren Hart <dvhart@...radead.org>, Andy Shevchenko <andy@...radead.org>, Mike Rapoport <rppt@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Paul Walmsley <paul.walmsley@...ive.com>, "Palmer Dabbelt" <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, "Paul E. McKenney" <paulmck@...nel.org>, Kees Cook <keescook@...omium.org>, <songmuchun@...edance.com>, Randy Dunlap <rdunlap@...radead.org>, <damien.lemoal@...nsource.wdc.com>, Stephen Boyd <swboyd@...omium.org>, <wei.liu@...nel.org>, <robin.murphy@....com>, <david@...hat.com>, <anshuman.khandual@....com>, <thunder.leizhen@...wei.com>, <gpiccoli@...lia.com>, <chenhuacai@...nel.org>, Geert Uytterhoeven <geert@...ux-m68k.org>, <chenzhou10@...wei.com>, <vijayb@...ux.microsoft.com>, <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-efi@...r.kernel.org>, <platform-driver-x86@...r.kernel.org>, <linux-mm@...ck.org>, <linux-riscv@...ts.infradead.org> Subject: Re: [PATCH v3 6/6] efi: Disable mirror feature if kernelcore is not specified On 2022/6/10 19:20, Ard Biesheuvel wrote: > On Tue, 7 Jun 2022 at 11:16, Wupeng Ma <mawupeng1@...wei.com> wrote: >> From: Ma Wupeng <mawupeng1@...wei.com> >> >> If system have some mirrored memory and mirrored feature is not specified >> in boot parameter, the basic mirrored feature will be enabled and this will >> lead to the following situations: >> >> - memblock memory allocation prefers mirrored region. This may have some >> unexpected influence on numa affinity. >> >> - contiguous memory will be split into several parts if parts of them >> is mirrored memory via memblock_mark_mirror(). >> >> To fix this, variable mirrored_kernelcore will be checked before calling >> efi_find_mirror() which will enable basic mirrored feature and this >> variable is true if kernelcore=mirror is added in the kernel parameters. >> >> Signed-off-by: Ma Wupeng <mawupeng1@...wei.com> > This seems like the wrong place to do this. If mirrored memory is > irrelevant to memblock, it should ignore the attribute. So I think > this check belongs in mm/memblock.c instead. Sound good, let's add check into memblock_mark_mirror() and retain the efi memory mirror information printing. > > >> --- >> drivers/firmware/efi/efi.c | 3 +++ >> include/linux/mm.h | 2 ++ >> mm/page_alloc.c | 2 +- >> 3 files changed, 6 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c >> index 79c232e07de7..8a5edcb0dd82 100644 >> --- a/drivers/firmware/efi/efi.c >> +++ b/drivers/firmware/efi/efi.c >> @@ -454,6 +454,9 @@ void __init efi_find_mirror(void) >> if (!efi_enabled(EFI_MEMMAP)) >> return; >> >> + if (!mirrored_kernelcore) >> + return; >> + >> for_each_efi_memory_desc(md) { >> unsigned long long start = md->phys_addr; >> unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; >> diff --git a/include/linux/mm.h b/include/linux/mm.h >> index bc8f326be0ce..741ac7d022c3 100644 >> --- a/include/linux/mm.h >> +++ b/include/linux/mm.h >> @@ -2540,6 +2540,8 @@ extern void get_pfn_range_for_nid(unsigned int nid, >> unsigned long *start_pfn, unsigned long *end_pfn); >> extern unsigned long find_min_pfn_with_active_regions(void); >> >> +extern bool mirrored_kernelcore; >> + >> #ifndef CONFIG_NUMA >> static inline int early_pfn_to_nid(unsigned long pfn) >> { >> diff --git a/mm/page_alloc.c b/mm/page_alloc.c >> index e008a3df0485..cf6f70aba787 100644 >> --- a/mm/page_alloc.c >> +++ b/mm/page_alloc.c >> @@ -356,7 +356,7 @@ static unsigned long required_kernelcore_percent __initdata; >> static unsigned long required_movablecore __initdata; >> static unsigned long required_movablecore_percent __initdata; >> static unsigned long zone_movable_pfn[MAX_NUMNODES] __initdata; >> -static bool mirrored_kernelcore __meminitdata; >> +bool mirrored_kernelcore __meminitdata; >> >> /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ >> int movable_zone; >> -- >> 2.25.1 >> > .
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