The patch titled
Subject: KVM: s390: prepare for hugepage vmalloc
has been added to the -mm tree. Its filename is
kvm-s390-prepare-for-hugepage-vmalloc.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kvm-s390-prepare-for-hugepage-vmalloc.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kvm-s390-prepare-for-hugepage-vmalloc.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Subject: KVM: s390: prepare for hugepage vmalloc
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.
Link: https://lkml.kernel.org/r/20210614132357.10202-3-imbrenda@xxxxxxxxxxxxx
Fixes: 121e6f3258fe3 ("mm/vmalloc: hugepage vmalloc mappings")
Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Acked-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Acked-by: Nicholas Piggin <npiggin@xxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/s390/kvm/pv.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/arch/s390/kvm/pv.c~kvm-s390-prepare-for-hugepage-vmalloc
+++ a/arch/s390/kvm/pv.c
@@ -140,7 +140,12 @@ static int kvm_s390_pv_alloc_vm(struct k
/* 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;
_
Patches currently in -mm which might be from imbrenda@xxxxxxxxxxxxx are
mm-vmalloc-add-vmalloc_no_huge.patch
kvm-s390-prepare-for-hugepage-vmalloc.patch
