[tip:,x86/mm] x86/mm: Recompute physical address for every page of per-CPU CEA mapping
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From: "tip-bot2 for Sean Christopherson" <tip-bot2@linutronix.de>
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Subject: [tip: x86/mm] x86/mm: Recompute physical address for every page of
per-CPU CEA mapping
Cc: Sean Christopherson <seanjc@google.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>, x86@kernel.org,
linux-kernel@vger.kernel.org
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[tip:,x86/mm] x86/mm: Recompute physical address for every page of per-CPU CEA mapping
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Commit Message
tip-bot2 for Thomas Gleixner
Dec. 17, 2022, 6:55 p.m. UTC
The following commit has been merged into the x86/mm branch of tip:
Commit-ID: 80d72a8f76e8f3f0b5a70b8c7022578e17bde8e7
Gitweb: https://git.kernel.org/tip/80d72a8f76e8f3f0b5a70b8c7022578e17bde8e7
Author: Sean Christopherson <seanjc@google.com>
AuthorDate: Thu, 10 Nov 2022 20:35:00
Committer: Dave Hansen <dave.hansen@linux.intel.com>
CommitterDate: Thu, 15 Dec 2022 10:37:28 -08:00
x86/mm: Recompute physical address for every page of per-CPU CEA mapping
Recompute the physical address for each per-CPU page in the CPU entry
area, a recent commit inadvertantly modified cea_map_percpu_pages() such
that every PTE is mapped to the physical address of the first page.
Fixes: 9fd429c28073 ("x86/kasan: Map shadow for percpu pages on demand")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Link: https://lkml.kernel.org/r/20221110203504.1985010-2-seanjc@google.com
---
arch/x86/mm/cpu_entry_area.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/mm/cpu_entry_area.c b/arch/x86/mm/cpu_entry_area.c index dff9001..d831aae 100644 --- a/arch/x86/mm/cpu_entry_area.c +++ b/arch/x86/mm/cpu_entry_area.c @@ -97,7 +97,7 @@ cea_map_percpu_pages(void *cea_vaddr, void *ptr, int pages, pgprot_t prot) early_pfn_to_nid(PFN_DOWN(pa))); for ( ; pages; pages--, cea_vaddr+= PAGE_SIZE, ptr += PAGE_SIZE) - cea_set_pte(cea_vaddr, pa, prot); + cea_set_pte(cea_vaddr, per_cpu_ptr_to_phys(ptr), prot); } static void __init percpu_setup_debug_store(unsigned int cpu)