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Subject[GIT pull] x86 updates for 5.0
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Date
Linus,

please pull the latest x86-urgent-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-for-linus

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.


Thanks,

tglx

------------------>
Borislav Petkov (1):
MAINTAINERS: Add Andy and Darren as arch/x86/platform/ reviewers

Colin Ian King (1):
x86/fault: Fix sign-extend unintended sign extension

Johannes Weiner (1):
x86/resctrl: Avoid confusion over the new X86_RESCTRL config

Kairui Song (1):
x86/kexec: Don't setup EFI info if EFI runtime is not enabled

Kan Liang (1):
x86/cpu: Add Atom Tremont (Jacobsville)

Thomas Lendacky (1):
x86/microcode/amd: Don't falsely trick the late loading mechanism

Wei Huang (1):
x86/boot/compressed/64: Set EFER.LME=1 in 32-bit trampoline before returning to long mode


Documentation/x86/resctrl_ui.txt | 2 +-
MAINTAINERS | 9 +++++++++
arch/x86/Kconfig | 6 +++---
arch/x86/boot/compressed/head_64.S | 8 ++++++++
arch/x86/boot/compressed/pgtable.h | 2 +-
arch/x86/include/asm/intel-family.h | 3 ++-
arch/x86/include/asm/resctrl_sched.h | 4 ++--
arch/x86/kernel/cpu/Makefile | 2 +-
arch/x86/kernel/cpu/microcode/amd.c | 2 +-
arch/x86/kernel/cpu/resctrl/Makefile | 4 ++--
arch/x86/kernel/kexec-bzimage64.c | 3 +++
arch/x86/mm/fault.c | 2 +-
include/linux/sched.h | 2 +-
13 files changed, 35 insertions(+), 14 deletions(-)

diff --git a/Documentation/x86/resctrl_ui.txt b/Documentation/x86/resctrl_ui.txt
index e8e8d14d3c4e..c1f95b59e14d 100644
--- a/Documentation/x86/resctrl_ui.txt
+++ b/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"
diff --git a/MAINTAINERS b/MAINTAINERS
index 32d444476a90..a98a7325df8c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16631,6 +16631,15 @@ 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
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 26387c7bf305..68261430fe6e 100644
--- a/arch/x86/Kconfig
+++ b/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.
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 64037895b085..f105ae8651c9 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/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
diff --git a/arch/x86/boot/compressed/pgtable.h b/arch/x86/boot/compressed/pgtable.h
index 91f75638f6e6..6ff7e81b5628 100644
--- a/arch/x86/boot/compressed/pgtable.h
+++ b/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

diff --git a/arch/x86/include/asm/intel-family.h b/arch/x86/include/asm/intel-family.h
index 0dd6b0f4000e..d9a9993af882 100644
--- a/arch/x86/include/asm/intel-family.h
+++ b/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 */

diff --git a/arch/x86/include/asm/resctrl_sched.h b/arch/x86/include/asm/resctrl_sched.h
index 40ebddde6ac2..f6b7fe2833cc 100644
--- a/arch/x86/include/asm/resctrl_sched.h
+++ b/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 */
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index b6fa0869f7aa..cfd24f9f7614 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/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

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 51adde0a0f1a..e1f3ba19ba54 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/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;
diff --git a/arch/x86/kernel/cpu/resctrl/Makefile b/arch/x86/kernel/cpu/resctrl/Makefile
index 1cabe6fd8e11..4a06c37b9cf1 100644
--- a/arch/x86/kernel/cpu/resctrl/Makefile
+++ b/arch/x86/kernel/cpu/resctrl/Makefile
@@ -1,4 +1,4 @@
# 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)
diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index 0d5efa34f359..53917a3ebf94 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/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;

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 2ff25ad33233..9d5c75f02295 100644
--- a/arch/x86/mm/fault.c
+++ b/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
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 224666226e87..8c328b14c424 100644
--- a/include/linux/sched.h
+++ b/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
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