Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 core updates from Ingo Molnar:
 "Note that in this cycle most of the x86 topics interacted at a level
  that caused them to be merged into tip:x86/asm - but this should be a
  temporary phenomenon, hopefully we'll back to the usual patterns in
  the next merge window.

  The main changes in this cycle were:

  Hardware enablement:

   - Add support for the Intel UMIP (User Mode Instruction Prevention)
     CPU feature. This is a security feature that disables certain
     instructions such as SGDT, SLDT, SIDT, SMSW and STR. (Ricardo Neri)

     [ Note that this is disabled by default for now, there are some
       smaller enhancements in the pipeline that I'll follow up with in
       the next 1-2 days, which allows this to be enabled by default.]

   - Add support for the AMD SEV (Secure Encrypted Virtualization) CPU
     feature, on top of SME (Secure Memory Encryption) support that was
     added in v4.14. (Tom Lendacky, Brijesh Singh)

   - Enable new SSE/AVX/AVX512 CPU features: AVX512_VBMI2, GFNI, VAES,
     VPCLMULQDQ, AVX512_VNNI, AVX512_BITALG. (Gayatri Kammela)

  Other changes:

   - A big series of entry code simplifications and enhancements (Andy
     Lutomirski)

   - Make the ORC unwinder default on x86 and various objtool
     enhancements. (Josh Poimboeuf)

   - 5-level paging enhancements (Kirill A. Shutemov)

   - Micro-optimize the entry code a bit (Borislav Petkov)

   - Improve the handling of interdependent CPU features in the early
     FPU init code (Andi Kleen)

   - Build system enhancements (Changbin Du, Masahiro Yamada)

   - ... plus misc enhancements, fixes and cleanups"

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (118 commits)
  x86/build: Make the boot image generation less verbose
  selftests/x86: Add tests for the STR and SLDT instructions
  selftests/x86: Add tests for User-Mode Instruction Prevention
  x86/traps: Fix up general protection faults caused by UMIP
  x86/umip: Enable User-Mode Instruction Prevention at runtime
  x86/umip: Force a page fault when unable to copy emulated result to user
  x86/umip: Add emulation code for UMIP instructions
  x86/cpufeature: Add User-Mode Instruction Prevention definitions
  x86/insn-eval: Add support to resolve 16-bit address encodings
  x86/insn-eval: Handle 32-bit address encodings in virtual-8086 mode
  x86/insn-eval: Add wrapper function for 32 and 64-bit addresses
  x86/insn-eval: Add support to resolve 32-bit address encodings
  x86/insn-eval: Compute linear address in several utility functions
  resource: Fix resource_size.cocci warnings
  X86/KVM: Clear encryption attribute when SEV is active
  X86/KVM: Decrypt shared per-cpu variables when SEV is active
  percpu: Introduce DEFINE_PER_CPU_DECRYPTED
  x86: Add support for changing memory encryption attribute in early boot
  x86/io: Unroll string I/O when SEV is active
  x86/boot: Add early boot support when running with SEV active
  ...

kernel/extable.c

@@ -31,6 +31,8 @@
  * mutex protecting text section modification (dynamic code patching).
  * some users need to sleep (allocating memory...) while they hold this lock.
  *
+ * Note: Also protects SMP-alternatives modification on x86.
+ *
  * NOT exported to modules - patching kernel text is a really delicate matter.
  */
 DEFINE_MUTEX(text_mutex);

kernel/kexec_file.c

@@ -406,9 +406,10 @@ static int locate_mem_hole_bottom_up(unsigned long start, unsigned long end,
 	return 1;
 }
 
-static int locate_mem_hole_callback(u64 start, u64 end, void *arg)
+static int locate_mem_hole_callback(struct resource *res, void *arg)
 {
 	struct kexec_buf *kbuf = (struct kexec_buf *)arg;
+	u64 start = res->start, end = res->end;
 	unsigned long sz = end - start + 1;
 
 	/* Returning 0 will take to next memory range */
@@ -437,7 +438,7 @@ static int locate_mem_hole_callback(u64 start, u64 end, void *arg)
  * func returning non-zero, then zero will be returned.
  */
 int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
-			       int (*func)(u64, u64, void *))
+			       int (*func)(struct resource *, void *))
 {
 	if (kbuf->image->type == KEXEC_TYPE_CRASH)
 		return walk_iomem_res_desc(crashk_res.desc,

kernel/resource.c

@@ -397,9 +397,32 @@ static int find_next_iomem_res(struct resource *res, unsigned long desc,
 		res->start = p->start;
 	if (res->end > p->end)
 		res->end = p->end;
+	res->flags = p->flags;
+	res->desc = p->desc;
 	return 0;
 }
 
+static int __walk_iomem_res_desc(struct resource *res, unsigned long desc,
+				 bool first_level_children_only,
+				 void *arg,
+				 int (*func)(struct resource *, void *))
+{
+	u64 orig_end = res->end;
+	int ret = -1;
+
+	while ((res->start < res->end) &&
+	       !find_next_iomem_res(res, desc, first_level_children_only)) {
+		ret = (*func)(res, arg);
+		if (ret)
+			break;
+
+		res->start = res->end + 1;
+		res->end = orig_end;
+	}
+
+	return ret;
+}
+
 /*
  * Walks through iomem resources and calls func() with matching resource
  * ranges. This walks through whole tree and not just first level children.
@@ -415,29 +438,15 @@ static int find_next_iomem_res(struct resource *res, unsigned long desc,
  * <linux/ioport.h> and set it in 'desc' of a target resource entry.
  */
 int walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start,
-		u64 end, void *arg, int (*func)(u64, u64, void *))
+		u64 end, void *arg, int (*func)(struct resource *, void *))
 {
 	struct resource res;
-	u64 orig_end;
-	int ret = -1;
 
 	res.start = start;
 	res.end = end;
 	res.flags = flags;
-	orig_end = res.end;
 
-	while ((res.start < res.end) &&
-		(!find_next_iomem_res(&res, desc, false))) {
-
-		ret = (*func)(res.start, res.end, arg);
-		if (ret)
-			break;
-
-		res.start = res.end + 1;
-		res.end = orig_end;
-	}
-
-	return ret;
+	return __walk_iomem_res_desc(&res, desc, false, arg, func);
 }
 
 /*
@@ -448,25 +457,33 @@ int walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start,
  * ranges.
  */
 int walk_system_ram_res(u64 start, u64 end, void *arg,
-				int (*func)(u64, u64, void *))
+				int (*func)(struct resource *, void *))
 {
 	struct resource res;
-	u64 orig_end;
-	int ret = -1;
 
 	res.start = start;
 	res.end = end;
 	res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
-	orig_end = res.end;
-	while ((res.start < res.end) &&
-		(!find_next_iomem_res(&res, IORES_DESC_NONE, true))) {
-		ret = (*func)(res.start, res.end, arg);
-		if (ret)
-			break;
-		res.start = res.end + 1;
-		res.end = orig_end;
-	}
-	return ret;
+
+	return __walk_iomem_res_desc(&res, IORES_DESC_NONE, true,
+				     arg, func);
+}
+
+/*
+ * This function calls the @func callback against all memory ranges, which
+ * are ranges marked as IORESOURCE_MEM and IORESOUCE_BUSY.
+ */
+int walk_mem_res(u64 start, u64 end, void *arg,
+		 int (*func)(struct resource *, void *))
+{
+	struct resource res;
+
+	res.start = start;
+	res.end = end;
+	res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+
+	return __walk_iomem_res_desc(&res, IORES_DESC_NONE, true,
+				     arg, func);
 }
 
 #if !defined(CONFIG_ARCH_HAS_WALK_MEMORY)
@@ -508,6 +525,7 @@ static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg)
 {
 	return 1;
 }
+
 /*
  * This generic page_is_ram() returns true if specified address is
  * registered as System RAM in iomem_resource list.