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

Pull x86 fixes from Thomas Gleixner:
 "A few updates for x86:

   - Fix an unintended sign extension issue in the fault handling code

   - Rename the new resource control config switch so it's less
     confusing

   - Avoid setting up EFI info in kexec when the EFI runtime is
     disabled.

   - Fix the microcode version check in the AMD microcode loader so it
     only loads higher version numbers and never downgrades

   - Set EFER.LME in the 32bit trampoline before returning to long mode
     to handle older AMD/KVM behaviour properly.

   - Add Darren and Andy as x86/platform reviewers"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/resctrl: Avoid confusion over the new X86_RESCTRL config
  x86/kexec: Don't setup EFI info if EFI runtime is not enabled
  x86/microcode/amd: Don't falsely trick the late loading mechanism
  MAINTAINERS: Add Andy and Darren as arch/x86/platform/ reviewers
  x86/fault: Fix sign-extend unintended sign extension
  x86/boot/compressed/64: Set EFER.LME=1 in 32-bit trampoline before returning to long mode
  x86/cpu: Add Atom Tremont (Jacobsville)

Documentation/x86/resctrl_ui.txt

@@ -9,7 +9,7 @@ Fenghua Yu <fenghua.yu@intel.com>
 Tony Luck <tony.luck@intel.com>
 Vikas Shivappa <vikas.shivappa@intel.com>
 
-This feature is enabled by the CONFIG_X86_RESCTRL and the x86 /proc/cpuinfo
+This feature is enabled by the CONFIG_X86_CPU_RESCTRL and the x86 /proc/cpuinfo
 flag bits:
 RDT (Resource Director Technology) Allocation - "rdt_a"
 CAT (Cache Allocation Technology) - "cat_l3", "cat_l2"

MAINTAINERS

@@ -16641,6 +16641,15 @@ S:	Maintained
 F:	drivers/platform/x86/
 F:	drivers/platform/olpc/
 
+X86 PLATFORM DRIVERS - ARCH
+R:	Darren Hart <dvhart@infradead.org>
+R:	Andy Shevchenko <andy@infradead.org>
+L:	platform-driver-x86@vger.kernel.org
+L:	x86@kernel.org
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/core
+S:	Maintained
+F:	arch/x86/platform
+
 X86 VDSO
 M:	Andy Lutomirski <luto@kernel.org>
 L:	linux-kernel@vger.kernel.org

arch/x86/Kconfig

@@ -446,12 +446,12 @@ config RETPOLINE
 	  branches. Requires a compiler with -mindirect-branch=thunk-extern
 	  support for full protection. The kernel may run slower.
 
-config X86_RESCTRL
-	bool "Resource Control support"
+config X86_CPU_RESCTRL
+	bool "x86 CPU resource control support"
 	depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
 	select KERNFS
 	help
-	  Enable Resource Control support.
+	  Enable x86 CPU resource control support.
 
 	  Provide support for the allocation and monitoring of system resources
 	  usage by the CPU.

arch/x86/boot/compressed/head_64.S

@@ -600,6 +600,14 @@ ENTRY(trampoline_32bit_src)
 	leal	TRAMPOLINE_32BIT_PGTABLE_OFFSET(%ecx), %eax
 	movl	%eax, %cr3
 3:
+	/* Set EFER.LME=1 as a precaution in case hypervsior pulls the rug */
+	pushl	%ecx
+	movl	$MSR_EFER, %ecx
+	rdmsr
+	btsl	$_EFER_LME, %eax
+	wrmsr
+	popl	%ecx
+
 	/* Enable PAE and LA57 (if required) paging modes */
 	movl	$X86_CR4_PAE, %eax
 	cmpl	$0, %edx

arch/x86/boot/compressed/pgtable.h

@@ -6,7 +6,7 @@
 #define TRAMPOLINE_32BIT_PGTABLE_OFFSET	0
 
 #define TRAMPOLINE_32BIT_CODE_OFFSET	PAGE_SIZE
-#define TRAMPOLINE_32BIT_CODE_SIZE	0x60
+#define TRAMPOLINE_32BIT_CODE_SIZE	0x70
 
 #define TRAMPOLINE_32BIT_STACK_END	TRAMPOLINE_32BIT_SIZE
 

arch/x86/include/asm/intel-family.h

@@ -6,7 +6,7 @@
  * "Big Core" Processors (Branded as Core, Xeon, etc...)
  *
  * The "_X" parts are generally the EP and EX Xeons, or the
- * "Extreme" ones, like Broadwell-E.
+ * "Extreme" ones, like Broadwell-E, or Atom microserver.
  *
  * While adding a new CPUID for a new microarchitecture, add a new
  * group to keep logically sorted out in chronological order. Within
@@ -71,6 +71,7 @@
 #define INTEL_FAM6_ATOM_GOLDMONT	0x5C /* Apollo Lake */
 #define INTEL_FAM6_ATOM_GOLDMONT_X	0x5F /* Denverton */
 #define INTEL_FAM6_ATOM_GOLDMONT_PLUS	0x7A /* Gemini Lake */
+#define INTEL_FAM6_ATOM_TREMONT_X	0x86 /* Jacobsville */
 
 /* Xeon Phi */
 

arch/x86/include/asm/resctrl_sched.h

@@ -2,7 +2,7 @@
 #ifndef _ASM_X86_RESCTRL_SCHED_H
 #define _ASM_X86_RESCTRL_SCHED_H
 
-#ifdef CONFIG_X86_RESCTRL
+#ifdef CONFIG_X86_CPU_RESCTRL
 
 #include <linux/sched.h>
 #include <linux/jump_label.h>
@@ -88,6 +88,6 @@ static inline void resctrl_sched_in(void)
 
 static inline void resctrl_sched_in(void) {}
 
-#endif /* CONFIG_X86_RESCTRL */
+#endif /* CONFIG_X86_CPU_RESCTRL */
 
 #endif /* _ASM_X86_RESCTRL_SCHED_H */

arch/x86/kernel/cpu/Makefile

@@ -39,7 +39,7 @@ obj-$(CONFIG_CPU_SUP_UMC_32)		+= umc.o
 obj-$(CONFIG_X86_MCE)			+= mce/
 obj-$(CONFIG_MTRR)			+= mtrr/
 obj-$(CONFIG_MICROCODE)			+= microcode/
-obj-$(CONFIG_X86_RESCTRL)		+= resctrl/
+obj-$(CONFIG_X86_CPU_RESCTRL)		+= resctrl/
 
 obj-$(CONFIG_X86_LOCAL_APIC)		+= perfctr-watchdog.o
 

arch/x86/kernel/cpu/microcode/amd.c

@@ -855,7 +855,7 @@ load_microcode_amd(bool save, u8 family, const u8 *data, size_t size)
 	if (!p) {
 		return ret;
 	} else {
-		if (boot_cpu_data.microcode == p->patch_id)
+		if (boot_cpu_data.microcode >= p->patch_id)
 			return ret;
 
 		ret = UCODE_NEW;

arch/x86/kernel/cpu/resctrl/Makefile

 # SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_X86_RESCTRL)	+= core.o rdtgroup.o monitor.o
-obj-$(CONFIG_X86_RESCTRL)	+= ctrlmondata.o pseudo_lock.o
+obj-$(CONFIG_X86_CPU_RESCTRL)	+= core.o rdtgroup.o monitor.o
+obj-$(CONFIG_X86_CPU_RESCTRL)	+= ctrlmondata.o pseudo_lock.o
 CFLAGS_pseudo_lock.o = -I$(src)

arch/x86/kernel/kexec-bzimage64.c

@@ -167,6 +167,9 @@ setup_efi_state(struct boot_params *params, unsigned long params_load_addr,
 	struct efi_info *current_ei = &boot_params.efi_info;
 	struct efi_info *ei = &params->efi_info;
 
+	if (!efi_enabled(EFI_RUNTIME_SERVICES))
+		return 0;
+
 	if (!current_ei->efi_memmap_size)
 		return 0;
 

arch/x86/mm/fault.c

@@ -595,7 +595,7 @@ static void show_ldttss(const struct desc_ptr *gdt, const char *name, u16 index)
 		return;
 	}
 
-	addr = desc.base0 | (desc.base1 << 16) | (desc.base2 << 24);
+	addr = desc.base0 | (desc.base1 << 16) | ((unsigned long)desc.base2 << 24);
 #ifdef CONFIG_X86_64
 	addr |= ((u64)desc.base3 << 32);
 #endif

include/linux/sched.h

@@ -995,7 +995,7 @@ struct task_struct {
 	/* cg_list protected by css_set_lock and tsk->alloc_lock: */
 	struct list_head		cg_list;
 #endif
-#ifdef CONFIG_X86_RESCTRL
+#ifdef CONFIG_X86_CPU_RESCTRL
 	u32				closid;
 	u32				rmid;
 #endif