| Message ID | 20210614132357.10202-3-imbrenda@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mm: add vmalloc_no_huge and use it | expand |
On 14.06.21 15:23, Claudio Imbrenda wrote: > The Create Secure Configuration Ultravisor Call does not support using > large pages for the virtual memory area. This is a hardware limitation. > > This patch replaces the vzalloc call with an almost equivalent call to > the newly introduced vmalloc_no_huge function, which guarantees that > only small pages will be used for the backing. > > The new call will not clear the allocated memory, but that has never > been an actual requirement. > > Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> > Reviewed-by: Janosch Frank <frankja@linux.ibm.com> > Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> > Acked-by: Nicholas Piggin <npiggin@gmail.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: Nicholas Piggin <npiggin@gmail.com> > Cc: Uladzislau Rezki (Sony) <urezki@gmail.com> > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Thomas Gleixner <tglx@linutronix.de> > Cc: Ingo Molnar <mingo@redhat.com> > Cc: David Rientjes <rientjes@google.com> > Cc: Christoph Hellwig <hch@infradead.org> > --- > arch/s390/kvm/pv.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c > index 813b6e93dc83..c8841f476e91 100644 > --- a/arch/s390/kvm/pv.c > +++ b/arch/s390/kvm/pv.c > @@ -140,7 +140,12 @@ static int kvm_s390_pv_alloc_vm(struct kvm *kvm) > /* Allocate variable storage */ > vlen = ALIGN(virt * ((npages * PAGE_SIZE) / HPAGE_SIZE), PAGE_SIZE); > vlen += uv_info.guest_virt_base_stor_len; > - kvm->arch.pv.stor_var = vzalloc(vlen); > + /* > + * The Create Secure Configuration Ultravisor Call does not support > + * using large pages for the virtual memory area. > + * This is a hardware limitation. > + */ > + kvm->arch.pv.stor_var = vmalloc_no_huge(vlen); > if (!kvm->arch.pv.stor_var) > goto out_err; > return 0; > Reviewed-by: David Hildenbrand <david@redhat.com>
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c index 813b6e93dc83..c8841f476e91 100644 --- a/arch/s390/kvm/pv.c +++ b/arch/s390/kvm/pv.c @@ -140,7 +140,12 @@ static int kvm_s390_pv_alloc_vm(struct kvm *kvm) /* Allocate variable storage */ vlen = ALIGN(virt * ((npages * PAGE_SIZE) / HPAGE_SIZE), PAGE_SIZE); vlen += uv_info.guest_virt_base_stor_len; - kvm->arch.pv.stor_var = vzalloc(vlen); + /* + * The Create Secure Configuration Ultravisor Call does not support + * using large pages for the virtual memory area. + * This is a hardware limitation. + */ + kvm->arch.pv.stor_var = vmalloc_no_huge(vlen); if (!kvm->arch.pv.stor_var) goto out_err; return 0;