s390/protvirt: add ultravisor initialization

Before being able to host protected virtual machines, donate some of
the memory to the ultravisor. Besides that the ultravisor might impose
addressing limitations for memory used to back protected VM storage. Treat
that limit as protected virtualization host's virtual memory limit.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
[borntraeger@de.ibm.com: patch merging, splitting, fixing]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index a2496382175e..1423090a2259 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -560,6 +560,9 @@ static void __init setup_memory_end(void)
 			vmax = _REGION1_SIZE; /* 4-level kernel page table */
 	}
 
+	if (is_prot_virt_host())
+		adjust_to_uv_max(&vmax);
+
 	/* module area is at the end of the kernel address space. */
 	MODULES_END = vmax;
 	MODULES_VADDR = MODULES_END - MODULES_LEN;
@@ -1134,6 +1137,8 @@ void __init setup_arch(char **cmdline_p)
 	 */
 	memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
 
+	if (is_prot_virt_host())
+		setup_uv();
 	setup_memory_end();
 	setup_memory();
 	dma_contiguous_reserve(memory_end);