Commit 80d72a8f authored by Sean Christopherson's avatar Sean Christopherson Committed by Dave Hansen
Browse files

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: default avatarSean Christopherson <seanjc@google.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarAndrey Ryabinin <ryabinin.a.a@gmail.com>
Link: https://lkml.kernel.org/r/20221110203504.1985010-2-seanjc@google.com
parent e996365e

arch/x86/mm/cpu_entry_area.c

+1 −1
Original line number Diff line number Diff line
@@ -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)