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-rw-r--r--arch/s390/boot/uv.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/s390/boot/uv.c b/arch/s390/boot/uv.c
new file mode 100644
index 000000000000..ed007f4a6444
--- /dev/null
+++ b/arch/s390/boot/uv.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <asm/uv.h>
+#include <asm/facility.h>
+#include <asm/sections.h>
+
+int __bootdata_preserved(prot_virt_guest);
+
+void uv_query_info(void)
+{
+ struct uv_cb_qui uvcb = {
+ .header.cmd = UVC_CMD_QUI,
+ .header.len = sizeof(uvcb)
+ };
+
+ if (!test_facility(158))
+ return;
+
+ if (uv_call(0, (uint64_t)&uvcb))
+ return;
+
+ if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
+ test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
+ prot_virt_guest = 1;
+}