arm/arm64: KVM: Stop propagating cacheability status of a faulted page

Now that we unconditionally flush newly mapped pages to the PoC,
there is no need to care about the "uncached" status of individual
pages - they must all be visible all the way down.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
index a58bbaa..95f38dc 100644 (file)
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -129,8 +129,7 @@ static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu)
 
 static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu,
                                               kvm_pfn_t pfn,
-                                              unsigned long size,
-                                              bool ipa_uncached)
+                                              unsigned long size)
 {
        /*
         * If we are going to insert an instruction page and the icache is

diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index a5265ed..5cc3508 100644 (file)
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -1232,9 +1232,9 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
 }
 
 static void coherent_cache_guest_page(struct kvm_vcpu *vcpu, kvm_pfn_t pfn,
-                                     unsigned long size, bool uncached)
+                                     unsigned long size)
 {
-       __coherent_cache_guest_page(vcpu, pfn, size, uncached);
+       __coherent_cache_guest_page(vcpu, pfn, size);
 }
 
 static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
@@ -1250,7 +1250,6 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
        struct vm_area_struct *vma;
        kvm_pfn_t pfn;
        pgprot_t mem_type = PAGE_S2;
-       bool fault_ipa_uncached;
        bool logging_active = memslot_is_logging(memslot);
        unsigned long flags = 0;
 
@@ -1337,8 +1336,6 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
        if (!hugetlb && !force_pte)
                hugetlb = transparent_hugepage_adjust(&pfn, &fault_ipa);
 
-       fault_ipa_uncached = memslot->flags & KVM_MEMSLOT_INCOHERENT;
-
        if (hugetlb) {
                pmd_t new_pmd = pfn_pmd(pfn, mem_type);
                new_pmd = pmd_mkhuge(new_pmd);
@@ -1346,7 +1343,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
                        new_pmd = kvm_s2pmd_mkwrite(new_pmd);
                        kvm_set_pfn_dirty(pfn);
                }
-               coherent_cache_guest_page(vcpu, pfn, PMD_SIZE, fault_ipa_uncached);
+               coherent_cache_guest_page(vcpu, pfn, PMD_SIZE);
                ret = stage2_set_pmd_huge(kvm, memcache, fault_ipa, &new_pmd);
        } else {
                pte_t new_pte = pfn_pte(pfn, mem_type);
@@ -1356,7 +1353,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
                        kvm_set_pfn_dirty(pfn);
                        mark_page_dirty(kvm, gfn);
                }
-               coherent_cache_guest_page(vcpu, pfn, PAGE_SIZE, fault_ipa_uncached);
+               coherent_cache_guest_page(vcpu, pfn, PAGE_SIZE);
                ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte, flags);
        }
 

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 6d22017..aa1e6db 100644 (file)
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -236,8 +236,7 @@ static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu)
 
 static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu,
                                               kvm_pfn_t pfn,
-                                              unsigned long size,
-                                              bool ipa_uncached)
+                                              unsigned long size)
 {
        void *va = page_address(pfn_to_page(pfn));