Subject: linux-next: manual merge of the kvm-arm tree with the kvm-fixes tree

From: Stephen Rothwell <[email-masked]>
Date: Fri, 31 Jul 2020 16:41:17 +1000

Hi all,

Today's linux-next merge of the kvm-arm tree got a conflict in:

  arch/arm64/kvm/mmu.c

between commit:

  b757b47a2fcb ("KVM: arm64: Don't inherit exec permission across page-table levels")

from the kvm-fixes tree and commit:

  a0e50aa3f4a8 ("KVM: arm64: Factor out stage 2 page table data from struct kvm")

from the kvm-arm tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc arch/arm64/kvm/mmu.c
index 7a7ddc4558a7,05e0e03fbdf8..000000000000
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@@ -124,11 -127,44 +127,12 @@@ static void stage2_dissolve_pud(struct 
  	put_page(virt_to_page(pudp));
  }
  
- static void clear_stage2_pgd_entry(struct kvm *kvm, pgd_t *pgd, phys_addr_t addr)
 -static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
 -				  int min, int max)
 -{
 -	void *page;
 -
 -	BUG_ON(max > KVM_NR_MEM_OBJS);
 -	if (cache->nobjs >= min)
 -		return 0;
 -	while (cache->nobjs < max) {
 -		page = (void *)__get_free_page(GFP_PGTABLE_USER);
 -		if (!page)
 -			return -ENOMEM;
 -		cache->objects[cache->nobjs++] = page;
 -	}
 -	return 0;
 -}
 -
 -static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc)
 -{
 -	while (mc->nobjs)
 -		free_page((unsigned long)mc->objects[--mc->nobjs]);
 -}
 -
 -static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc)
 -{
 -	void *p;
 -
 -	BUG_ON(!mc || !mc->nobjs);
 -	p = mc->objects[--mc->nobjs];
 -	return p;
 -}
 -
+ static void clear_stage2_pgd_entry(struct kvm_s2_mmu *mmu, pgd_t *pgd, phys_addr_t addr)
  {
+ 	struct kvm *kvm = mmu->kvm;
  	p4d_t *p4d_table __maybe_unused = stage2_p4d_offset(kvm, pgd, 0UL);
  	stage2_pgd_clear(kvm, pgd);
- 	kvm_tlb_flush_vmid_ipa(kvm, addr);
+ 	kvm_tlb_flush_vmid_ipa(mmu, addr, S2_NO_LEVEL_HINT);
  	stage2_p4d_free(kvm, p4d_table);
  	put_page(virt_to_page(pgd));
  }
@@@ -1294,7 -1356,7 +1324,8 @@@ static bool stage2_get_leaf_entry(struc
  	return true;
  }
  
- static bool stage2_is_exec(struct kvm *kvm, phys_addr_t addr, unsigned long sz)
 -static bool stage2_is_exec(struct kvm_s2_mmu *mmu, phys_addr_t addr)
++static bool stage2_is_exec(struct kvm_s2_mmu *mmu, phys_addr_t addr,
++			   unsigned long sz)
  {
  	pud_t *pudp;
  	pmd_t *pmdp;
@@@ -1306,14 -1368,15 +1337,15 @@@
  		return false;
  
  	if (pudp)
 -		return kvm_s2pud_exec(pudp);
 +		return sz <= PUD_SIZE && kvm_s2pud_exec(pudp);
  	else if (pmdp)
 -		return kvm_s2pmd_exec(pmdp);
 +		return sz <= PMD_SIZE && kvm_s2pmd_exec(pmdp);
  	else
 -		return kvm_s2pte_exec(ptep);
 +		return sz == PAGE_SIZE && kvm_s2pte_exec(ptep);
  }
  
- static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
+ static int stage2_set_pte(struct kvm_s2_mmu *mmu,
+ 			  struct kvm_mmu_memory_cache *cache,
  			  phys_addr_t addr, const pte_t *new_pte,
  			  unsigned long flags)
  {
@@@ -1924,8 -1995,7 +1962,8 @@@ static int user_mem_abort(struct kvm_vc
  	 * execute permissions, and we preserve whatever we have.
  	 */
  	needs_exec = exec_fault ||
 -		(fault_status == FSC_PERM && stage2_is_exec(mmu, fault_ipa));
 +		(fault_status == FSC_PERM &&
- 		 stage2_is_exec(kvm, fault_ipa, vma_pagesize));
++		 stage2_is_exec(mmu, fault_ipa, vma_pagesize));
  
  	if (vma_pagesize == PUD_SIZE) {
  		pud_t new_pud = kvm_pfn_pud(pfn, mem_type);