1 files changed, 91 insertions, 0 deletions
diff --git a/arch/s390/boot/uv.c b/arch/s390/boot/uv.c
new file mode 100644
index 000000000..0a077c0a2
--- /dev/null
+++ b/arch/s390/boot/uv.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <asm/uv.h>
+#include <asm/boot_data.h>
+#include <asm/facility.h>
+#include <asm/sections.h>
+
+#include "boot.h"
+#include "uv.h"
+
+/* will be used in arch/s390/kernel/uv.c */
+#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
+int __bootdata_preserved(prot_virt_guest);
+#endif
+#if IS_ENABLED(CONFIG_KVM)
+int __bootdata_preserved(prot_virt_host);
+#endif
+struct uv_info __bootdata_preserved(uv_info);
+
+void uv_query_info(void)
+{
+	struct uv_cb_qui uvcb = {
+		.header.cmd = UVC_CMD_QUI,
+		.header.len = sizeof(uvcb)
+	};
+
+	if (!test_facility(158))
+		return;
+
+	/* rc==0x100 means that there is additional data we do not process */
+	if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
+		return;
+
+	if (IS_ENABLED(CONFIG_KVM)) {
+		memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list));
+		uv_info.uv_base_stor_len = uvcb.uv_base_stor_len;
+		uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len;
+		uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len;
+		uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len;
+		uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len;
+		uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
+		uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
+		uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id;
+		uv_info.uv_feature_indications = uvcb.uv_feature_indications;
+		uv_info.supp_se_hdr_ver = uvcb.supp_se_hdr_versions;
+		uv_info.supp_se_hdr_pcf = uvcb.supp_se_hdr_pcf;
+		uv_info.conf_dump_storage_state_len = uvcb.conf_dump_storage_state_len;
+		uv_info.conf_dump_finalize_len = uvcb.conf_dump_finalize_len;
+		uv_info.supp_att_req_hdr_ver = uvcb.supp_att_req_hdr_ver;
+		uv_info.supp_att_pflags = uvcb.supp_att_pflags;
+	}
+
+#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
+	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;
+#endif
+}
+
+#if IS_ENABLED(CONFIG_KVM)
+unsigned long adjust_to_uv_max(unsigned long limit)
+{
+	if (is_prot_virt_host() && uv_info.max_sec_stor_addr)
+		limit = min_t(unsigned long, limit, uv_info.max_sec_stor_addr);
+	return limit;
+}
+
+static int is_prot_virt_host_capable(void)
+{
+	/* disable if no prot_virt=1 given on command-line */
+	if (!is_prot_virt_host())
+		return 0;
+	/* disable if protected guest virtualization is enabled */
+	if (is_prot_virt_guest())
+		return 0;
+	/* disable if no hardware support */
+	if (!test_facility(158))
+		return 0;
+	/* disable if kdump */
+	if (oldmem_data.start)
+		return 0;
+	/* disable if stand-alone dump */
+	if (ipl_block_valid && is_ipl_block_dump())
+		return 0;
+	return 1;
+}
+
+void sanitize_prot_virt_host(void)
+{
+	prot_virt_host = is_prot_virt_host_capable();
+}
+#endif