KVM: arm/arm64: Remove unnecessary CMOs when creating HYP page tables

There is no need to perform cache maintenance operations when
creating the HYP page tables if we have the multiprocessing
extensions. ARMv7 mandates them with the virtualization support,
and ARMv8 just mandates them unconditionally.

Let's remove these operations.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index eade30caaa3c53f64c402a830720a3237fe64167..97d27cd9c654b6d46225993d9d3ab4f2d96f5318 100644 (file)
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -609,7 +609,6 @@ static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start,
                pte = pte_offset_kernel(pmd, addr);
                kvm_set_pte(pte, pfn_pte(pfn, prot));
                get_page(virt_to_page(pte));
-               kvm_flush_dcache_to_poc(pte, sizeof(*pte));
                pfn++;
        } while (addr += PAGE_SIZE, addr != end);
 }
@@ -636,7 +635,6 @@ static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start,
                        }
                        kvm_pmd_populate(pmd, pte);
                        get_page(virt_to_page(pmd));
-                       kvm_flush_dcache_to_poc(pmd, sizeof(*pmd));
                }
 
                next = pmd_addr_end(addr, end);
@@ -669,7 +667,6 @@ static int create_hyp_pud_mappings(pgd_t *pgd, unsigned long start,
                        }
                        kvm_pud_populate(pud, pmd);
                        get_page(virt_to_page(pud));
-                       kvm_flush_dcache_to_poc(pud, sizeof(*pud));
                }
 
                next = pud_addr_end(addr, end);
@@ -706,7 +703,6 @@ static int __create_hyp_mappings(pgd_t *pgdp, unsigned long ptrs_per_pgd,
                        }
                        kvm_pgd_populate(pgd, pud);
                        get_page(virt_to_page(pgd));
-                       kvm_flush_dcache_to_poc(pgd, sizeof(*pgd));
                }
 
                next = pgd_addr_end(addr, end);