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Commit cb5fb87a authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

Merge tag 'kvm-s390-master-4.19-2' of... 

Merge tag 'kvm-s390-master-4.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

KVM: s390: Fixes for 4.19

- more fallout from the hugetlbfs enablement
- bugfix for vma handling
parents 7876320f 40ebdb8e

Documentation/virtual/kvm/api.txt

+2 −1
Original line number Diff line number Diff line
@@ -4510,7 +4510,8 @@ Do not enable KVM_FEATURE_PV_UNHALT if you disable HLT exits. 
Architectures: s390

Parameters: none

Returns: 0 on success, -EINVAL if hpage module parameter was not set

	 or cmma is enabled

	 or cmma is enabled, or the VM has the KVM_VM_S390_UCONTROL

	 flag set



With this capability the KVM support for memory backing with 1m pages

through hugetlbfs can be enabled for a VM. After the capability is

arch/s390/kvm/kvm-s390.c

+2 −2
Original line number Diff line number Diff line
@@ -481,7 +481,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 
		break;

	case KVM_CAP_S390_HPAGE_1M:

		r = 0;

		if (hpage)

		if (hpage && !kvm_is_ucontrol(kvm))

			r = 1;

		break;

	case KVM_CAP_S390_MEM_OP:
@@ -691,7 +691,7 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) 
		mutex_lock(&kvm->lock);

		if (kvm->created_vcpus)

			r = -EBUSY;

		else if (!hpage || kvm->arch.use_cmma)

		else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm))

			r = -EINVAL;

		else {

			r = 0;

arch/s390/mm/gmap.c

+3 −1
Original line number Diff line number Diff line
@@ -708,11 +708,13 @@ void gmap_discard(struct gmap *gmap, unsigned long from, unsigned long to) 
		vmaddr |= gaddr & ~PMD_MASK;

		/* Find vma in the parent mm */

		vma = find_vma(gmap->mm, vmaddr);

		if (!vma)

			continue;

		/*

		 * We do not discard pages that are backed by

		 * hugetlbfs, so we don't have to refault them.

		 */

		if (vma && is_vm_hugetlb_page(vma))

		if (is_vm_hugetlb_page(vma))

			continue;

		size = min(to - gaddr, PMD_SIZE - (gaddr & ~PMD_MASK));

		zap_page_range(vma, vmaddr, size);