The patch titled
Subject: KVM: s390: fix for hugepage vmalloc
has been added to the -mm tree. Its filename is
kvm-s390-fix-for-hugepage-vmalloc.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kvm-s390-fix-for-hugepage-vmalloc.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kvm-s390-fix-for-hugepage-vmalloc.patch
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------------------------------------------------------
From: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Subject: KVM: s390: fix 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 a longer but equivalent
__vmalloc_node_range call, also setting the VM_NO_HUGE_VMAP flag, to
guarantee that this allocation will not be performed with large pages.
Link: https://lkml.kernel.org/r/20210608180618.477766-3-imbrenda@xxxxxxxxxxxxx
Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Fixes: 121e6f3258fe393e22c3 ("mm/vmalloc: hugepage vmalloc mappings")
Acked-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> [s390]
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: Janosch Frank <frankja@xxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/s390/kvm/pv.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/arch/s390/kvm/pv.c~kvm-s390-fix-for-hugepage-vmalloc
+++ a/arch/s390/kvm/pv.c
@@ -140,7 +140,10 @@ 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);
+ kvm->arch.pv.stor_var = __vmalloc_node_range(vlen, PAGE_SIZE, VMALLOC_START, VMALLOC_END,
+ GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL,
+ VM_NO_HUGE_VMAP, NUMA_NO_NODE,
+ __builtin_return_address(0));
if (!kvm->arch.pv.stor_var)
goto out_err;
return 0;
_
Patches currently in -mm which might be from imbrenda@xxxxxxxxxxxxx are
mm-vmalloc-export-__vmalloc_node_range.patch
kvm-s390-fix-for-hugepage-vmalloc.patch
