Re: [PATCH v4 1/2] kvm/arm64: Remove the creation time's mapping of MMIO regions

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Keqian,

On 4/16/21 12:03 AM, Keqian Zhu wrote:
The MMIO regions may be unmapped for many reasons and can be remapped
by stage2 fault path. Map MMIO regions at creation time becomes a
minor optimization and makes these two mapping path hard to sync.

Remove the mapping code while keep the useful sanity check.

Signed-off-by: Keqian Zhu <zhukeqian1@xxxxxxxxxx>
---
  arch/arm64/kvm/mmu.c | 38 +++-----------------------------------
  1 file changed, 3 insertions(+), 35 deletions(-)


After removing the logic to create stage2 mapping for VM_PFNMAP region,
I think the "do { } while" loop becomes unnecessary and can be dropped
completely. It means the only sanity check is to see if the memory slot
overflows IPA space or not. In that case, KVM_MR_FLAGS_ONLY can be
ignored because the memory slot's base address and length aren't changed
when we have KVM_MR_FLAGS_ONLY.

It seems the patch isn't based on "next" branch because find_vma() was
replaced by find_vma_intersection() by one of my patches :)

Thanks,
Gavin

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 8711894db8c2..c59af5ca01b0 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1301,7 +1301,6 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
  {
  	hva_t hva = mem->userspace_addr;
  	hva_t reg_end = hva + mem->memory_size;
-	bool writable = !(mem->flags & KVM_MEM_READONLY);
  	int ret = 0;
if (change != KVM_MR_CREATE && change != KVM_MR_MOVE &&
@@ -1318,8 +1317,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
  	mmap_read_lock(current->mm);
  	/*
  	 * A memory region could potentially cover multiple VMAs, and any holes
-	 * between them, so iterate over all of them to find out if we can map
-	 * any of them right now.
+	 * between them, so iterate over all of them.
  	 *
  	 *     +--------------------------------------------+
  	 * +---------------+----------------+   +----------------+
@@ -1330,50 +1328,20 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
  	 */
  	do {
  		struct vm_area_struct *vma = find_vma(current->mm, hva);
-		hva_t vm_start, vm_end;
if (!vma || vma->vm_start >= reg_end)
  			break;
- /*
-		 * Take the intersection of this VMA with the memory region
-		 */
-		vm_start = max(hva, vma->vm_start);
-		vm_end = min(reg_end, vma->vm_end);
-
  		if (vma->vm_flags & VM_PFNMAP) {
-			gpa_t gpa = mem->guest_phys_addr +
-				    (vm_start - mem->userspace_addr);
-			phys_addr_t pa;
-
-			pa = (phys_addr_t)vma->vm_pgoff << PAGE_SHIFT;
-			pa += vm_start - vma->vm_start;
-
  			/* IO region dirty page logging not allowed */
  			if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES) {
  				ret = -EINVAL;
-				goto out;
-			}
-
-			ret = kvm_phys_addr_ioremap(kvm, gpa, pa,
-						    vm_end - vm_start,
-						    writable);
-			if (ret)
  				break;
+			}
  		}
-		hva = vm_end;
+		hva = min(reg_end, vma->vm_end);
  	} while (hva < reg_end);
- if (change == KVM_MR_FLAGS_ONLY)
-		goto out;
-
-	spin_lock(&kvm->mmu_lock);
-	if (ret)
-		unmap_stage2_range(&kvm->arch.mmu, mem->guest_phys_addr, mem->memory_size);
-	else if (!cpus_have_final_cap(ARM64_HAS_STAGE2_FWB))
-		stage2_flush_memslot(kvm, memslot);
-	spin_unlock(&kvm->mmu_lock);
-out:
  	mmap_read_unlock(current->mm);
  	return ret;
  }


_______________________________________________
kvmarm mailing list
kvmarm@xxxxxxxxxxxxxxxxxxxxx
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm



[Index of Archives]     [Linux KVM]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux