Patch 5a677ce044f1 (ARM: KVM: switch to a dual-step HYP init code) introduced code that flushes page tables to the point of coherency. This is overkill (point of unification is enough), and actually not required if running on a SMP capable platform.
Change this code to use clean_dcache_area(), which is updated by ae8a8b9553bd (ARM: 7691/1: mm: kill unused TLB_CAN_READ_FROM_L1_CACHE and use ALT_SMP instead) to behave as a no-op on SMP ARMv7. Reported-by: Catalin Marinas <[email protected]> Cc: Will Deacon <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> --- arch/arm/include/asm/kvm_mmu.h | 1 + arch/arm/kvm/mmu.c | 6 +++--- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h index 472ac70..2459821 100644 --- a/arch/arm/include/asm/kvm_mmu.h +++ b/arch/arm/include/asm/kvm_mmu.h @@ -129,6 +129,7 @@ static inline void coherent_icache_guest_page(struct kvm *kvm, gfn_t gfn) } #define kvm_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l)) +#define kvm_clean_dcache_to_pou(a,l) clean_dcache_area((a), (l)) #endif /* !__ASSEMBLY__ */ diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c index 71f2a57..b978ebe 100644 --- a/arch/arm/kvm/mmu.c +++ b/arch/arm/kvm/mmu.c @@ -228,7 +228,7 @@ 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)); + kvm_clean_dcache_to_pou(pte, sizeof(*pte)); pfn++; } while (addr += PAGE_SIZE, addr != end); } @@ -255,7 +255,7 @@ static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start, } pmd_populate_kernel(NULL, pmd, pte); get_page(virt_to_page(pmd)); - kvm_flush_dcache_to_poc(pmd, sizeof(*pmd)); + kvm_clean_dcache_to_pou(pmd, sizeof(*pmd)); } next = pmd_addr_end(addr, end); @@ -293,7 +293,7 @@ static int __create_hyp_mappings(pgd_t *pgdp, } pud_populate(NULL, pud, pmd); get_page(virt_to_page(pud)); - kvm_flush_dcache_to_poc(pud, sizeof(*pud)); + kvm_clean_dcache_to_pou(pud, sizeof(*pud)); } next = pgd_addr_end(addr, end); -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
