diff mbox series

[v2,1/5] x86/mm: Recompute physical address for every page of per-CPU CEA mapping

Message ID 20221110203504.1985010-2-seanjc@google.com
State New
Headers
Series x86/kasan: Bug fixes for recent CEA changes |

Commit Message

Sean Christopherson Nov. 10, 2022, 8:35 p.m. UTC 
  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")
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/mm/cpu_entry_area.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Andrey Ryabinin Nov. 14, 2022, 2:09 p.m. UTC | #1 
On 11/10/22 23:35, Sean Christopherson wrote:
> 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")
> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
> Signed-off-by: Sean Christopherson <seanjc@google.com>

Reviewed-by: Andrey Ryabinin <ryabinin.a.a@gmail.com>
diff mbox series

Patch

diff --git a/arch/x86/mm/cpu_entry_area.c b/arch/x86/mm/cpu_entry_area.c
index dff9001e5e12..d831aae94b41 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)