linux-kernel - [tip: x86/mm] x86/mm: Recompute physical address for every page of per-CPU CEA mapping

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Date:   Sat, 17 Dec 2022 18:55:30 -0000
From:   "tip-bot2 for Sean Christopherson" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/mm] x86/mm: Recompute physical address for every page of
 per-CPU CEA mapping

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@...gle.com>
AuthorDate:    Thu, 10 Nov 2022 20:35:00 
Committer:     Dave Hansen <dave.hansen@...ux.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@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Andrey Ryabinin <ryabinin.a.a@...il.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)