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hc
2023-12-06 08f87f769b595151be1afeff53e144f543faa614 
 kernel/arch/x86/xen/setup.c
....@@ -12,6 +12,7 @@
1212 #include <linux/memblock.h>
1313 #include <linux/cpuidle.h>
1414 #include <linux/cpufreq.h>
15
+#include <linux/memory_hotplug.h>
1516 
1617 #include <asm/elf.h>
1718 #include <asm/vdso.h>
....@@ -19,6 +20,7 @@
1920 #include <asm/setup.h>
2021 #include <asm/acpi.h>
2122 #include <asm/numa.h>
23
+#include <asm/idtentry.h>
2224 #include <asm/xen/hypervisor.h>
2325 #include <asm/xen/hypercall.h>
2426 
....@@ -30,7 +32,6 @@
3032 #include <xen/features.h>
3133 #include <xen/hvc-console.h>
3234 #include "xen-ops.h"
33
-#include "vdso.h"
3435 #include "mmu.h"
3536 
3637 #define GB(x) ((uint64_t)(x) * 1024 * 1024 * 1024)
....@@ -58,13 +59,13 @@
5859 } xen_remap_buf __initdata __aligned(PAGE_SIZE);
5960 static unsigned long xen_remap_mfn __initdata = INVALID_P2M_ENTRY;
6061 
61
-/* 
62
+/*
6263  * The maximum amount of extra memory compared to the base size.  The
6364  * main scaling factor is the size of struct page.  At extreme ratios
6465  * of base:extra, all the base memory can be filled with page
6566  * structures for the extra memory, leaving no space for anything
6667  * else.
67
- * 
68
+ *
6869  * 10x seems like a reasonable balance between scaling flexibility and
6970  * leaving a practically usable system.
7071  */
....@@ -411,7 +412,7 @@
411412 
412413 		remap_range_size = xen_find_pfn_range(&remap_pfn);
413414 		if (!remap_range_size) {
414
-			pr_warning("Unable to find available pfn range, not remapping identity pages\n");
415
+			pr_warn("Unable to find available pfn range, not remapping identity pages\n");
415416 			xen_set_identity_and_release_chunk(cur_pfn,
416417 						cur_pfn + left, nr_pages);
417418 			break;
....@@ -493,7 +494,7 @@
493494  * The remap information (which mfn remap to which pfn) is contained in the
494495  * to be remapped memory itself in a linked list anchored at xen_remap_mfn.
495496  * This scheme allows to remap the different chunks in arbitrary order while
496
- * the resulting mapping will be independant from the order.
497
+ * the resulting mapping will be independent from the order.
497498  */
498499 void __init xen_remap_memory(void)
499500 {
....@@ -543,13 +544,10 @@
543544 {
544545 	unsigned long limit;
545546 
546
-#ifdef CONFIG_X86_32
547
-	limit = GB(64) / PAGE_SIZE;
548
-#else
549547 	limit = MAXMEM / PAGE_SIZE;
550548 	if (!xen_initial_domain() && xen_512gb_limit)
551549 		limit = GB(512) / PAGE_SIZE;
552
-#endif
550
+
553551 	return limit;
554552 }
555553 
....@@ -589,6 +587,14 @@
589587 	if (type == E820_TYPE_RAM) {
590588 		start = PAGE_ALIGN(start);
591589 		end &= ~((phys_addr_t)PAGE_SIZE - 1);
590
+#ifdef CONFIG_MEMORY_HOTPLUG
591
+		/*
592
+		 * Don't allow adding memory not in E820 map while booting the
593
+		 * system. Once the balloon driver is up it will remove that
594
+		 * restriction again.
595
+		 */
596
+		max_mem_size = end;
597
+#endif
592598 	}
593599 
594600 	e820__range_add(start, end - start, type);
....@@ -712,17 +718,8 @@
712718 	if (!xen_is_e820_reserved(start, size))
713719 		return;
714720 
715
-#ifdef CONFIG_X86_32
716
-	/*
717
-	 * Relocating the p2m on 32 bit system to an arbitrary virtual address
718
-	 * is not supported, so just give up.
719
-	 */
720
-	xen_raw_console_write("Xen hypervisor allocated p2m list conflicts with E820 map\n");
721
-	BUG();
722
-#else
723721 	xen_relocate_p2m();
724722 	memblock_free(start, size);
725
-#endif
726723 }
727724 
728725 /**
....@@ -747,6 +744,10 @@
747744 
748745 	memmap.nr_entries = ARRAY_SIZE(xen_e820_table.entries);
749746 	set_xen_guest_handle(memmap.buffer, xen_e820_table.entries);
747
+
748
+#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_XEN_BALLOON)
749
+	xen_saved_max_mem_size = max_mem_size;
750
+#endif
750751 
751752 	op = xen_initial_domain() ?
752753 		XENMEM_machine_memory_map :
....@@ -790,17 +791,10 @@
790791 
791792 	/*
792793 	 * Clamp the amount of extra memory to a EXTRA_MEM_RATIO
793
-	 * factor the base size.  On non-highmem systems, the base
794
-	 * size is the full initial memory allocation; on highmem it
795
-	 * is limited to the max size of lowmem, so that it doesn't
796
-	 * get completely filled.
794
+	 * factor the base size.
797795 	 *
798796 	 * Make sure we have no memory above max_pages, as this area
799797 	 * isn't handled by the p2m management.
800
-	 *
801
-	 * In principle there could be a problem in lowmem systems if
802
-	 * the initial memory is also very large with respect to
803
-	 * lowmem, but we won't try to deal with that here.
804798 	 */
805799 	extra_pages = min3(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
806800 			   extra_pages, max_pages - max_pfn);
....@@ -907,20 +901,6 @@
907901 	return "Xen";
908902 }
909903 
910
-/*
911
- * Set the bit indicating "nosegneg" library variants should be used.
912
- * We only need to bother in pure 32-bit mode; compat 32-bit processes
913
- * can have un-truncated segments, so wrapping around is allowed.
914
- */
915
-static void __init fiddle_vdso(void)
916
-{
917
-#ifdef CONFIG_X86_32
918
-	u32 *mask = vdso_image_32.data +
919
-		vdso_image_32.sym_VDSO32_NOTE_MASK;
920
-	*mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
921
-#endif
922
-}
923
-
924904 static int register_callback(unsigned type, const void *func)
925905 {
926906 	struct callback_register callback = {
....@@ -937,26 +917,21 @@
937917 	int ret;
938918 	unsigned sysenter_feature;
939919 
940
-#ifdef CONFIG_X86_32
941
-	sysenter_feature = X86_FEATURE_SEP;
942
-#else
943920 	sysenter_feature = X86_FEATURE_SYSENTER32;
944
-#endif
945921 
946922 	if (!boot_cpu_has(sysenter_feature))
947923 		return;
948924 
949
-	ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target);
925
+	ret = register_callback(CALLBACKTYPE_sysenter, xen_entry_SYSENTER_compat);
950926 	if(ret != 0)
951927 		setup_clear_cpu_cap(sysenter_feature);
952928 }
953929 
954930 void xen_enable_syscall(void)
955931 {
956
-#ifdef CONFIG_X86_64
957932 	int ret;
958933 
959
-	ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target);
934
+	ret = register_callback(CALLBACKTYPE_syscall, xen_entry_SYSCALL_64);
960935 	if (ret != 0) {
961936 		printk(KERN_ERR "Failed to set syscall callback: %d\n", ret);
962937 		/* Pretty fatal; 64-bit userspace has no other
....@@ -965,14 +940,13 @@
965940 
966941 	if (boot_cpu_has(X86_FEATURE_SYSCALL32)) {
967942 		ret = register_callback(CALLBACKTYPE_syscall32,
968
-					xen_syscall32_target);
943
+					xen_entry_SYSCALL_compat);
969944 		if (ret != 0)
970945 			setup_clear_cpu_cap(X86_FEATURE_SYSCALL32);
971946 	}
972
-#endif /* CONFIG_X86_64 */
973947 }
974948 
975
-void __init xen_pvmmu_arch_setup(void)
949
+static void __init xen_pvmmu_arch_setup(void)
976950 {
977951 	HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
978952 	HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
....@@ -980,7 +954,8 @@
980954 	HYPERVISOR_vm_assist(VMASST_CMD_enable,
981955 			     VMASST_TYPE_pae_extended_cr3);
982956 
983
-	if (register_callback(CALLBACKTYPE_event, xen_hypervisor_callback) ||
957
+	if (register_callback(CALLBACKTYPE_event,
958
+			      xen_asm_exc_xen_hypervisor_callback) ||
984959 	    register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback))
985960 		BUG();
986961 
....@@ -1009,7 +984,6 @@
1009984 	disable_cpuidle();
1010985 	disable_cpufreq();
1011986 	WARN_ON(xen_set_default_idle());
1012
-	fiddle_vdso();
1013987 #ifdef CONFIG_NUMA
1014988 	numa_off = 1;
1015989 #endif