s390: Remove protvirt and kvm config guards for uv code

Removing the CONFIG_PROTECTED_VIRTUALIZATION_GUEST ifdefs and config
option as well as CONFIG_KVM ifdefs in uv files.

Having this configurable has been more of a pain than a help.
It's time to remove the ifdefs and the config option.

Signed-off-by: Janosch Frank <[email protected]>
Acked-by: Christian Borntraeger <[email protected]>
Acked-by: Heiko Carstens <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

Author: frankjaa

arch/s390/Kconfig

@@ -799,17 +799,6 @@ config HAVE_PNETID
 
 menu "Virtualization"
 
-config PROTECTED_VIRTUALIZATION_GUEST
-	def_bool n
-	prompt "Protected virtualization guest support"
-	help
-	  Select this option, if you want to be able to run this
-	  kernel as a protected virtualization KVM guest.
-	  Protected virtualization capable machines have a mini hypervisor
-	  located at machine level (an ultravisor). With help of the
-	  Ultravisor, KVM will be able to run "protected" VMs, special
-	  VMs whose memory and management data are unavailable to KVM.
-
 config PFAULT
 	def_bool y
 	prompt "Pseudo page fault support"

arch/s390/boot/Makefile

@@ -39,8 +39,7 @@ CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char
 
 obj-y	:= head.o als.o startup.o physmem_info.o ipl_parm.o ipl_report.o vmem.o
 obj-y	+= string.o ebcdic.o sclp_early_core.o mem.o ipl_vmparm.o cmdline.o
-obj-y	+= version.o pgm_check_info.o ctype.o ipl_data.o relocs.o alternative.o
-obj-$(findstring y, $(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) $(CONFIG_PGSTE))	+= uv.o
+obj-y	+= version.o pgm_check_info.o ctype.o ipl_data.o relocs.o alternative.o uv.o
 obj-$(CONFIG_RANDOMIZE_BASE)	+= kaslr.o
 obj-y	+= $(if $(CONFIG_KERNEL_UNCOMPRESSED),,decompressor.o) info.o
 obj-$(CONFIG_KERNEL_ZSTD) += clz_ctz.o

arch/s390/boot/uv.c

@@ -8,12 +8,8 @@
 #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)
@@ -53,14 +49,11 @@ void uv_query_info(void)
 		uv_info.max_secrets = uvcb.max_secrets;
 	}
 
-#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)
@@ -92,4 +85,3 @@ void sanitize_prot_virt_host(void)
 {
 	prot_virt_host = is_prot_virt_host_capable();
 }
-#endif

arch/s390/boot/uv.h

@@ -2,21 +2,8 @@
 #ifndef BOOT_UV_H
 #define BOOT_UV_H
 
-#if IS_ENABLED(CONFIG_KVM)
 unsigned long adjust_to_uv_max(unsigned long limit);
 void sanitize_prot_virt_host(void);
-#else
-static inline unsigned long adjust_to_uv_max(unsigned long limit)
-{
-	return limit;
-}
-static inline void sanitize_prot_virt_host(void) {}
-#endif
-
-#if defined(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) || IS_ENABLED(CONFIG_KVM)
 void uv_query_info(void);
-#else
-static inline void uv_query_info(void) {}
-#endif
 
 #endif /* BOOT_UV_H */

arch/s390/configs/debug_defconfig

@@ -55,7 +55,6 @@ CONFIG_EXPOLINE_AUTO=y
 CONFIG_CHSC_SCH=y
 CONFIG_VFIO_CCW=m
 CONFIG_VFIO_AP=m
-CONFIG_PROTECTED_VIRTUALIZATION_GUEST=y
 CONFIG_CMM=m
 CONFIG_APPLDATA_BASE=y
 CONFIG_S390_HYPFS_FS=y

arch/s390/configs/defconfig

@@ -53,7 +53,6 @@ CONFIG_EXPOLINE_AUTO=y
 CONFIG_CHSC_SCH=y
 CONFIG_VFIO_CCW=m
 CONFIG_VFIO_AP=m
-CONFIG_PROTECTED_VIRTUALIZATION_GUEST=y
 CONFIG_CMM=m
 CONFIG_APPLDATA_BASE=y
 CONFIG_S390_HYPFS_FS=y

arch/s390/include/asm/page.h

@@ -174,12 +174,10 @@ static inline int devmem_is_allowed(unsigned long pfn)
 #define HAVE_ARCH_FREE_PAGE
 #define HAVE_ARCH_ALLOC_PAGE
 
-#if IS_ENABLED(CONFIG_PGSTE)
 int arch_make_folio_accessible(struct folio *folio);
 #define HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE
 int arch_make_page_accessible(struct page *page);
 #define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE
-#endif
 
 struct vm_layout {
 	unsigned long kaslr_offset;

arch/s390/include/asm/uv.h

@@ -414,7 +414,6 @@ static inline bool uv_has_feature(u8 feature_bit)
 	return test_bit_inv(feature_bit, &uv_info.uv_feature_indications);
 }
 
-#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
 extern int prot_virt_guest;
 
 static inline int is_prot_virt_guest(void)
@@ -466,13 +465,6 @@ static inline int uv_remove_shared(unsigned long addr)
 	return share(addr, UVC_CMD_REMOVE_SHARED_ACCESS);
 }
 
-#else
-#define is_prot_virt_guest() 0
-static inline int uv_set_shared(unsigned long addr) { return 0; }
-static inline int uv_remove_shared(unsigned long addr) { return 0; }
-#endif
-
-#if IS_ENABLED(CONFIG_KVM)
 extern int prot_virt_host;
 
 static inline int is_prot_virt_host(void)
@@ -489,29 +481,5 @@ int uv_convert_from_secure_pte(pte_t pte);
 int gmap_convert_to_secure(struct gmap *gmap, unsigned long gaddr);
 
 void setup_uv(void);
-#else
-#define is_prot_virt_host() 0
-static inline void setup_uv(void) {}
-
-static inline int uv_pin_shared(unsigned long paddr)
-{
-	return 0;
-}
-
-static inline int uv_destroy_folio(struct folio *folio)
-{
-	return 0;
-}
-
-static inline int uv_destroy_pte(pte_t pte)
-{
-	return 0;
-}
-
-static inline int uv_convert_from_secure_pte(pte_t pte)
-{
-	return 0;
-}
-#endif
 
 #endif /* _ASM_S390_UV_H */

arch/s390/kernel/Makefile

@@ -43,7 +43,7 @@ obj-y	+= sysinfo.o lgr.o os_info.o ctlreg.o
 obj-y	+= runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
 obj-y	+= entry.o reipl.o kdebugfs.o alternative.o
 obj-y	+= nospec-branch.o ipl_vmparm.o machine_kexec_reloc.o unwind_bc.o
-obj-y	+= smp.o text_amode31.o stacktrace.o abs_lowcore.o facility.o
+obj-y	+= smp.o text_amode31.o stacktrace.o abs_lowcore.o facility.o uv.o
 
 extra-y				+= vmlinux.lds
 
@@ -80,7 +80,6 @@ obj-$(CONFIG_PERF_EVENTS)	+= perf_cpum_cf_events.o perf_regs.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_pai_crypto.o perf_pai_ext.o
 
 obj-$(CONFIG_TRACEPOINTS)	+= trace.o
-obj-$(findstring y, $(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) $(CONFIG_PGSTE))	+= uv.o
 
 # vdso
 obj-y				+= vdso64/

arch/s390/kernel/uv.c

@@ -18,11 +18,22 @@
 #include <asm/sections.h>
 #include <asm/uv.h>
 
+#if !IS_ENABLED(CONFIG_KVM)
+unsigned long __gmap_translate(struct gmap *gmap, unsigned long gaddr)
+{
+	return 0;
+}
+
+int gmap_fault(struct gmap *gmap, unsigned long gaddr,
+	       unsigned int fault_flags)
+{
+	return 0;
+}
+#endif
+
 /* the bootdata_preserved fields come from ones in arch/s390/boot/uv.c */
-#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
 int __bootdata_preserved(prot_virt_guest);
 EXPORT_SYMBOL(prot_virt_guest);
-#endif
 
 /*
  * uv_info contains both host and guest information but it's currently only
@@ -35,7 +46,6 @@ EXPORT_SYMBOL(prot_virt_guest);
 struct uv_info __bootdata_preserved(uv_info);
 EXPORT_SYMBOL(uv_info);
 
-#if IS_ENABLED(CONFIG_KVM)
 int __bootdata_preserved(prot_virt_host);
 EXPORT_SYMBOL(prot_virt_host);
 
@@ -543,9 +553,6 @@ int arch_make_page_accessible(struct page *page)
 	return arch_make_folio_accessible(page_folio(page));
 }
 EXPORT_SYMBOL_GPL(arch_make_page_accessible);
-#endif
-
-#if defined(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) || IS_ENABLED(CONFIG_KVM)
 static ssize_t uv_query_facilities(struct kobject *kobj,
 				   struct kobj_attribute *attr, char *buf)
 {
@@ -721,24 +728,13 @@ static struct attribute_group uv_query_attr_group = {
 static ssize_t uv_is_prot_virt_guest(struct kobject *kobj,
 				     struct kobj_attribute *attr, char *buf)
 {
-	int val = 0;
-
-#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
-	val = prot_virt_guest;
-#endif
-	return sysfs_emit(buf, "%d\n", val);
+	return sysfs_emit(buf, "%d\n", prot_virt_guest);
 }
 
 static ssize_t uv_is_prot_virt_host(struct kobject *kobj,
 				    struct kobj_attribute *attr, char *buf)
 {
-	int val = 0;
-
-#if IS_ENABLED(CONFIG_KVM)
-	val = prot_virt_host;
-#endif
-
-	return sysfs_emit(buf, "%d\n", val);
+	return sysfs_emit(buf, "%d\n", prot_virt_host);
 }
 
 static struct kobj_attribute uv_prot_virt_guest =
@@ -790,4 +786,3 @@ static int __init uv_info_init(void)
 	return rc;
 }
 device_initcall(uv_info_init);
-#endif