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Subjectlinux-next: manual merge of the kvm tree with Linus' tree
Hi all,

Today's linux-next merge of the kvm tree got a conflict in
arch/arm/kvm/mmu.c between commit 0d3e4d4fade6 ("arm/arm64: KVM: Use
kernel mapping to perform invalidation on page fault"") from Linus'
tree and commit 3b0f1d01e501 ("KVM: Rename
kvm_arch_mmu_write_protect_pt_masked to be more generic for log dirty")
from the kvm tree.

I fixed it up (see below) and can carry the fix as necessary (no action
is required).

--
Cheers,
Stephen Rothwell sfr@canb.auug.org.au

diff --cc arch/arm/kvm/mmu.c
index 136662547ca6,6034697ede3f..000000000000
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@@ -58,26 -78,25 +78,45 @@@ static void kvm_tlb_flush_vmid_ipa(stru
kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa);
}

+/*
+ * D-Cache management functions. They take the page table entries by
+ * value, as they are flushing the cache using the kernel mapping (or
+ * kmap on 32bit).
+ */
+static void kvm_flush_dcache_pte(pte_t pte)
+{
+ __kvm_flush_dcache_pte(pte);
+}
+
+static void kvm_flush_dcache_pmd(pmd_t pmd)
+{
+ __kvm_flush_dcache_pmd(pmd);
+}
+
+static void kvm_flush_dcache_pud(pud_t pud)
+{
+ __kvm_flush_dcache_pud(pud);
+}
+
+ /**
+ * stage2_dissolve_pmd() - clear and flush huge PMD entry
+ * @kvm: pointer to kvm structure.
+ * @addr: IPA
+ * @pmd: pmd pointer for IPA
+ *
+ * Function clears a PMD entry, flushes addr 1st and 2nd stage TLBs. Marks all
+ * pages in the range dirty.
+ */
+ static void stage2_dissolve_pmd(struct kvm *kvm, phys_addr_t addr, pmd_t *pmd)
+ {
+ if (!kvm_pmd_huge(*pmd))
+ return;
+
+ pmd_clear(pmd);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+ put_page(virt_to_page(pmd));
+ }
+
static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
int min, int max)
{
@@@ -957,12 -957,165 +1009,171 @@@ static bool kvm_is_device_pfn(unsigned
return !pfn_valid(pfn);
}

+static void coherent_cache_guest_page(struct kvm_vcpu *vcpu, pfn_t pfn,
+ unsigned long size, bool uncached)
+{
+ __coherent_cache_guest_page(vcpu, pfn, size, uncached);
+}
+
+ /**
+ * stage2_wp_ptes - write protect PMD range
+ * @pmd: pointer to pmd entry
+ * @addr: range start address
+ * @end: range end address
+ */
+ static void stage2_wp_ptes(pmd_t *pmd, phys_addr_t addr, phys_addr_t end)
+ {
+ pte_t *pte;
+
+ pte = pte_offset_kernel(pmd, addr);
+ do {
+ if (!pte_none(*pte)) {
+ if (!kvm_s2pte_readonly(pte))
+ kvm_set_s2pte_readonly(pte);
+ }
+ } while (pte++, addr += PAGE_SIZE, addr != end);
+ }
+
+ /**
+ * stage2_wp_pmds - write protect PUD range
+ * @pud: pointer to pud entry
+ * @addr: range start address
+ * @end: range end address
+ */
+ static void stage2_wp_pmds(pud_t *pud, phys_addr_t addr, phys_addr_t end)
+ {
+ pmd_t *pmd;
+ phys_addr_t next;
+
+ pmd = pmd_offset(pud, addr);
+
+ do {
+ next = kvm_pmd_addr_end(addr, end);
+ if (!pmd_none(*pmd)) {
+ if (kvm_pmd_huge(*pmd)) {
+ if (!kvm_s2pmd_readonly(pmd))
+ kvm_set_s2pmd_readonly(pmd);
+ } else {
+ stage2_wp_ptes(pmd, addr, next);
+ }
+ }
+ } while (pmd++, addr = next, addr != end);
+ }
+
+ /**
+ * stage2_wp_puds - write protect PGD range
+ * @pgd: pointer to pgd entry
+ * @addr: range start address
+ * @end: range end address
+ *
+ * Process PUD entries, for a huge PUD we cause a panic.
+ */
+ static void stage2_wp_puds(pgd_t *pgd, phys_addr_t addr, phys_addr_t end)
+ {
+ pud_t *pud;
+ phys_addr_t next;
+
+ pud = pud_offset(pgd, addr);
+ do {
+ next = kvm_pud_addr_end(addr, end);
+ if (!pud_none(*pud)) {
+ /* TODO:PUD not supported, revisit later if supported */
+ BUG_ON(kvm_pud_huge(*pud));
+ stage2_wp_pmds(pud, addr, next);
+ }
+ } while (pud++, addr = next, addr != end);
+ }
+
+ /**
+ * stage2_wp_range() - write protect stage2 memory region range
+ * @kvm: The KVM pointer
+ * @addr: Start address of range
+ * @end: End address of range
+ */
+ static void stage2_wp_range(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
+ {
+ pgd_t *pgd;
+ phys_addr_t next;
+
+ pgd = kvm->arch.pgd + pgd_index(addr);
+ do {
+ /*
+ * Release kvm_mmu_lock periodically if the memory region is
+ * large. Otherwise, we may see kernel panics with
+ * CONFIG_DETECT_HUNG_TASK, CONFIG_LOCKUP_DETECTOR,
+ * CONFIG_LOCKDEP. Additionally, holding the lock too long
+ * will also starve other vCPUs.
+ */
+ if (need_resched() || spin_needbreak(&kvm->mmu_lock))
+ cond_resched_lock(&kvm->mmu_lock);
+
+ next = kvm_pgd_addr_end(addr, end);
+ if (pgd_present(*pgd))
+ stage2_wp_puds(pgd, addr, next);
+ } while (pgd++, addr = next, addr != end);
+ }
+
+ /**
+ * kvm_mmu_wp_memory_region() - write protect stage 2 entries for memory slot
+ * @kvm: The KVM pointer
+ * @slot: The memory slot to write protect
+ *
+ * Called to start logging dirty pages after memory region
+ * KVM_MEM_LOG_DIRTY_PAGES operation is called. After this function returns
+ * all present PMD and PTEs are write protected in the memory region.
+ * Afterwards read of dirty page log can be called.
+ *
+ * Acquires kvm_mmu_lock. Called with kvm->slots_lock mutex acquired,
+ * serializing operations for VM memory regions.
+ */
+ void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot)
+ {
+ struct kvm_memory_slot *memslot = id_to_memslot(kvm->memslots, slot);
+ phys_addr_t start = memslot->base_gfn << PAGE_SHIFT;
+ phys_addr_t end = (memslot->base_gfn + memslot->npages) << PAGE_SHIFT;
+
+ spin_lock(&kvm->mmu_lock);
+ stage2_wp_range(kvm, start, end);
+ spin_unlock(&kvm->mmu_lock);
+ kvm_flush_remote_tlbs(kvm);
+ }
+
+ /**
+ * kvm_mmu_write_protect_pt_masked() - write protect dirty pages
+ * @kvm: The KVM pointer
+ * @slot: The memory slot associated with mask
+ * @gfn_offset: The gfn offset in memory slot
+ * @mask: The mask of dirty pages at offset 'gfn_offset' in this memory
+ * slot to be write protected
+ *
+ * Walks bits set in mask write protects the associated pte's. Caller must
+ * acquire kvm_mmu_lock.
+ */
+ static void kvm_mmu_write_protect_pt_masked(struct kvm *kvm,
+ struct kvm_memory_slot *slot,
+ gfn_t gfn_offset, unsigned long mask)
+ {
+ phys_addr_t base_gfn = slot->base_gfn + gfn_offset;
+ phys_addr_t start = (base_gfn + __ffs(mask)) << PAGE_SHIFT;
+ phys_addr_t end = (base_gfn + __fls(mask) + 1) << PAGE_SHIFT;
+
+ stage2_wp_range(kvm, start, end);
+ }
+
+ /*
+ * kvm_arch_mmu_enable_log_dirty_pt_masked - enable dirty logging for selected
+ * dirty pages.
+ *
+ * It calls kvm_mmu_write_protect_pt_masked to write protect selected pages to
+ * enable dirty logging for them.
+ */
+ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
+ struct kvm_memory_slot *slot,
+ gfn_t gfn_offset, unsigned long mask)
+ {
+ kvm_mmu_write_protect_pt_masked(kvm, slot, gfn_offset, mask);
+ }
+
static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
struct kvm_memory_slot *memslot, unsigned long hva,
unsigned long fault_status)
@@@ -1059,13 -1234,13 +1291,12 @@@
if (writable) {
kvm_set_s2pte_writable(&new_pte);
kvm_set_pfn_dirty(pfn);
+ mark_page_dirty(kvm, gfn);
}
- coherent_cache_guest_page(vcpu, hva, PAGE_SIZE,
- fault_ipa_uncached);
+ coherent_cache_guest_page(vcpu, pfn, PAGE_SIZE, fault_ipa_uncached);
- ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte,
- pgprot_val(mem_type) == pgprot_val(PAGE_S2_DEVICE));
+ ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte, flags);
}

out_unlock:
spin_unlock(&kvm->mmu_lock);
kvm_release_pfn_clean(pfn);
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