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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@linux.ibm.com
Fixes: 121e6f3258 ("mm/vmalloc: hugepage vmalloc mappings")
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>
Reviewed-by: David Hildenbrand <david@redhat.com>
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Claudio Imbrenda 2021-06-24 18:39:39 -07:00 committed by Linus Torvalds
parent 15a64f5a88
commit 185cca24e9
1 changed files with 6 additions and 1 deletions
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7
arch/s390/kvm/pv.c
View File

@ -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;