Linux patch 5.4.1945.4-198

Signed-off-by: Mike Pagano <mpagano@gentoo.org>

2 files changed, 1099 insertions, 0 deletions

diff --git a/0000_README b/0000_README
index b454bd62..5292ae1a 100644
--- a/0000_README
+++ b/0000_README
@@ -815,6 +815,10 @@ Patch:  1192_linux-5.4.193.patch
 From:   http://www.kernel.org
 Desc:   Linux 5.4.193
 
+Patch:  1193_linux-5.4.194.patch
+From:   http://www.kernel.org
+Desc:   Linux 5.4.194
+
 Patch:  1500_XATTR_USER_PREFIX.patch
 From:   https://bugs.gentoo.org/show_bug.cgi?id=470644
 Desc:   Support for namespace user.pax.* on tmpfs.
diff --git a/1193_linux-5.4.194.patch b/1193_linux-5.4.194.patch
new file mode 100644
index 00000000..2e238496
--- /dev/null
+++ b/1193_linux-5.4.194.patch
@@ -0,0 +1,1095 @@
+diff --git a/Documentation/vm/memory-model.rst b/Documentation/vm/memory-model.rst
+index 58a12376b7df7..94db75ba7fbe2 100644
+--- a/Documentation/vm/memory-model.rst
++++ b/Documentation/vm/memory-model.rst
+@@ -52,8 +52,7 @@ wrapper :c:func:`free_area_init`. Yet, the mappings array is not
+ usable until the call to :c:func:`memblock_free_all` that hands all
+ the memory to the page allocator.
+ 
+-If an architecture enables `CONFIG_ARCH_HAS_HOLES_MEMORYMODEL` option,
+-it may free parts of the `mem_map` array that do not cover the
++An architecture may free parts of the `mem_map` array that do not cover the
+ actual physical pages. In such case, the architecture specific
+ :c:func:`pfn_valid` implementation should take the holes in the
+ `mem_map` into account.
+diff --git a/Makefile b/Makefile
+index 888d896058553..044a85fea9216 100644
+--- a/Makefile
++++ b/Makefile
+@@ -1,7 +1,7 @@
+ # SPDX-License-Identifier: GPL-2.0
+ VERSION = 5
+ PATCHLEVEL = 4
+-SUBLEVEL = 193
++SUBLEVEL = 194
+ EXTRAVERSION =
+ NAME = Kleptomaniac Octopus
+ 
+diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
+index 4b36bbcf5a5b4..a1622b9290fd5 100644
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -26,7 +26,7 @@ config ARM
+ 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+ 	select ARCH_HAVE_CUSTOM_GPIO_H
+ 	select ARCH_HAS_GCOV_PROFILE_ALL
+-	select ARCH_KEEP_MEMBLOCK if HAVE_ARCH_PFN_VALID || KEXEC
++	select ARCH_KEEP_MEMBLOCK
+ 	select ARCH_MIGHT_HAVE_PC_PARPORT
+ 	select ARCH_NO_SG_CHAIN if !ARM_HAS_SG_CHAIN
+ 	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
+@@ -521,7 +521,6 @@ config ARCH_S3C24XX
+ config ARCH_OMAP1
+ 	bool "TI OMAP1"
+ 	depends on MMU
+-	select ARCH_HAS_HOLES_MEMORYMODEL
+ 	select ARCH_OMAP
+ 	select CLKDEV_LOOKUP
+ 	select CLKSRC_MMIO
+@@ -1518,9 +1517,6 @@ config OABI_COMPAT
+ 	  UNPREDICTABLE (in fact it can be predicted that it won't work
+ 	  at all). If in doubt say N.
+ 
+-config ARCH_HAS_HOLES_MEMORYMODEL
+-	bool
+-
+ config ARCH_SPARSEMEM_ENABLE
+ 	bool
+ 
+@@ -1528,7 +1524,7 @@ config ARCH_SPARSEMEM_DEFAULT
+ 	def_bool ARCH_SPARSEMEM_ENABLE
+ 
+ config HAVE_ARCH_PFN_VALID
+-	def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
++	def_bool y
+ 
+ config HIGHMEM
+ 	bool "High Memory Support"
+diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
+index 5e5f1fabc3d40..634d1bc3c0114 100644
+--- a/arch/arm/mach-bcm/Kconfig
++++ b/arch/arm/mach-bcm/Kconfig
+@@ -214,7 +214,6 @@ config ARCH_BRCMSTB
+ 	select HAVE_ARM_ARCH_TIMER
+ 	select BRCMSTB_L2_IRQ
+ 	select BCM7120_L2_IRQ
+-	select ARCH_HAS_HOLES_MEMORYMODEL
+ 	select ZONE_DMA if ARM_LPAE
+ 	select SOC_BRCMSTB
+ 	select SOC_BUS
+diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig
+index 02b180ad72454..4d3b7d0418c40 100644
+--- a/arch/arm/mach-davinci/Kconfig
++++ b/arch/arm/mach-davinci/Kconfig
+@@ -5,7 +5,6 @@ menuconfig ARCH_DAVINCI
+ 	depends on ARCH_MULTI_V5
+ 	select DAVINCI_TIMER
+ 	select ZONE_DMA
+-	select ARCH_HAS_HOLES_MEMORYMODEL
+ 	select PM_GENERIC_DOMAINS if PM
+ 	select PM_GENERIC_DOMAINS_OF if PM && OF
+ 	select REGMAP_MMIO
+diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
+index 9dab1f50a02f8..fc01137628e4b 100644
+--- a/arch/arm/mach-exynos/Kconfig
++++ b/arch/arm/mach-exynos/Kconfig
+@@ -8,7 +8,6 @@
+ menuconfig ARCH_EXYNOS
+ 	bool "Samsung EXYNOS"
+ 	depends on ARCH_MULTI_V7
+-	select ARCH_HAS_HOLES_MEMORYMODEL
+ 	select ARCH_SUPPORTS_BIG_ENDIAN
+ 	select ARM_AMBA
+ 	select ARM_GIC
+diff --git a/arch/arm/mach-highbank/Kconfig b/arch/arm/mach-highbank/Kconfig
+index 1bc68913d62c1..9de38ce8124f2 100644
+--- a/arch/arm/mach-highbank/Kconfig
++++ b/arch/arm/mach-highbank/Kconfig
+@@ -2,7 +2,6 @@
+ config ARCH_HIGHBANK
+ 	bool "Calxeda ECX-1000/2000 (Highbank/Midway)"
+ 	depends on ARCH_MULTI_V7
+-	select ARCH_HAS_HOLES_MEMORYMODEL
+ 	select ARCH_SUPPORTS_BIG_ENDIAN
+ 	select ARM_AMBA
+ 	select ARM_ERRATA_764369 if SMP
+diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
+index fdb6743760a2e..0211f4aa8cc75 100644
+--- a/arch/arm/mach-omap2/Kconfig
++++ b/arch/arm/mach-omap2/Kconfig
+@@ -94,7 +94,7 @@ config SOC_DRA7XX
+ config ARCH_OMAP2PLUS
+ 	bool
+ 	select ARCH_HAS_BANDGAP
+-	select ARCH_HAS_HOLES_MEMORYMODEL
++	select ARCH_HAS_RESET_CONTROLLER
+ 	select ARCH_OMAP
+ 	select CLKSRC_MMIO
+ 	select GENERIC_IRQ_CHIP
+diff --git a/arch/arm/mach-s5pv210/Kconfig b/arch/arm/mach-s5pv210/Kconfig
+index 03984a7918791..69ff1bb89f38f 100644
+--- a/arch/arm/mach-s5pv210/Kconfig
++++ b/arch/arm/mach-s5pv210/Kconfig
+@@ -8,7 +8,6 @@
+ config ARCH_S5PV210
+ 	bool "Samsung S5PV210/S5PC110"
+ 	depends on ARCH_MULTI_V7
+-	select ARCH_HAS_HOLES_MEMORYMODEL
+ 	select ARM_VIC
+ 	select CLKSRC_SAMSUNG_PWM
+ 	select COMMON_CLK_SAMSUNG
+diff --git a/arch/arm/mach-tango/Kconfig b/arch/arm/mach-tango/Kconfig
+index 25b2fd4348617..a9eeda36aeb15 100644
+--- a/arch/arm/mach-tango/Kconfig
++++ b/arch/arm/mach-tango/Kconfig
+@@ -3,7 +3,6 @@ config ARCH_TANGO
+ 	bool "Sigma Designs Tango4 (SMP87xx)"
+ 	depends on ARCH_MULTI_V7
+ 	# Cortex-A9 MPCore r3p0, PL310 r3p2
+-	select ARCH_HAS_HOLES_MEMORYMODEL
+ 	select ARM_ERRATA_754322
+ 	select ARM_ERRATA_764369 if SMP
+ 	select ARM_ERRATA_775420
+diff --git a/arch/mips/bmips/setup.c b/arch/mips/bmips/setup.c
+index 2f81a94c71a60..7aee9ff19c1a6 100644
+--- a/arch/mips/bmips/setup.c
++++ b/arch/mips/bmips/setup.c
+@@ -167,7 +167,7 @@ void __init plat_mem_setup(void)
+ 		dtb = phys_to_virt(fw_arg2);
+ 	else if (fw_passed_dtb) /* UHI interface or appended dtb */
+ 		dtb = (void *)fw_passed_dtb;
+-	else if (__dtb_start != __dtb_end)
++	else if (&__dtb_start != &__dtb_end)
+ 		dtb = (void *)__dtb_start;
+ 	else
+ 		panic("no dtb found");
+diff --git a/arch/mips/lantiq/prom.c b/arch/mips/lantiq/prom.c
+index 51a218f04fe0d..3f568f5aae2d1 100644
+--- a/arch/mips/lantiq/prom.c
++++ b/arch/mips/lantiq/prom.c
+@@ -79,7 +79,7 @@ void __init plat_mem_setup(void)
+ 
+ 	if (fw_passed_dtb) /* UHI interface */
+ 		dtb = (void *)fw_passed_dtb;
+-	else if (__dtb_start != __dtb_end)
++	else if (&__dtb_start != &__dtb_end)
+ 		dtb = (void *)__dtb_start;
+ 	else
+ 		panic("no dtb found");
+diff --git a/arch/mips/pic32/pic32mzda/init.c b/arch/mips/pic32/pic32mzda/init.c
+index 50f376f058f43..f232c77ff5265 100644
+--- a/arch/mips/pic32/pic32mzda/init.c
++++ b/arch/mips/pic32/pic32mzda/init.c
+@@ -28,7 +28,7 @@ static ulong get_fdtaddr(void)
+ 	if (fw_passed_dtb && !fw_arg2 && !fw_arg3)
+ 		return (ulong)fw_passed_dtb;
+ 
+-	if (__dtb_start < __dtb_end)
++	if (&__dtb_start < &__dtb_end)
+ 		ftaddr = (ulong)__dtb_start;
+ 
+ 	return ftaddr;
+diff --git a/arch/mips/ralink/of.c b/arch/mips/ralink/of.c
+index 4e38a905ab386..e2c71c6c667da 100644
+--- a/arch/mips/ralink/of.c
++++ b/arch/mips/ralink/of.c
+@@ -77,7 +77,7 @@ void __init plat_mem_setup(void)
+ 	 */
+ 	if (fw_passed_dtb)
+ 		dtb = (void *)fw_passed_dtb;
+-	else if (__dtb_start != __dtb_end)
++	else if (&__dtb_start != &__dtb_end)
+ 		dtb = (void *)__dtb_start;
+ 
+ 	__dt_setup_arch(dtb);
+diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
+index 3ff577c0b1024..1b563f9167eae 100644
+--- a/arch/x86/include/asm/asm.h
++++ b/arch/x86/include/asm/asm.h
+@@ -7,9 +7,11 @@
+ # define __ASM_FORM_RAW(x)     x
+ # define __ASM_FORM_COMMA(x) x,
+ #else
+-# define __ASM_FORM(x)	" " #x " "
+-# define __ASM_FORM_RAW(x)     #x
+-# define __ASM_FORM_COMMA(x) " " #x ","
++#include <linux/stringify.h>
++
++# define __ASM_FORM(x)	" " __stringify(x) " "
++# define __ASM_FORM_RAW(x)     __stringify(x)
++# define __ASM_FORM_COMMA(x) " " __stringify(x) ","
+ #endif
+ 
+ #ifndef __x86_64__
+diff --git a/arch/x86/include/asm/emulate_prefix.h b/arch/x86/include/asm/emulate_prefix.h
+new file mode 100644
+index 0000000000000..70f5b98a52869
+--- /dev/null
++++ b/arch/x86/include/asm/emulate_prefix.h
+@@ -0,0 +1,14 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++#ifndef _ASM_X86_EMULATE_PREFIX_H
++#define _ASM_X86_EMULATE_PREFIX_H
++
++/*
++ * Virt escape sequences to trigger instruction emulation;
++ * ideally these would decode to 'whole' instruction and not destroy
++ * the instruction stream; sadly this is not true for the 'kvm' one :/
++ */
++
++#define __XEN_EMULATE_PREFIX  0x0f,0x0b,0x78,0x65,0x6e  /* ud2 ; .ascii "xen" */
++#define __KVM_EMULATE_PREFIX  0x0f,0x0b,0x6b,0x76,0x6d	/* ud2 ; .ascii "kvm" */
++
++#endif
+diff --git a/arch/x86/include/asm/insn.h b/arch/x86/include/asm/insn.h
+index a51ffeea6d879..a8c3d284fa46c 100644
+--- a/arch/x86/include/asm/insn.h
++++ b/arch/x86/include/asm/insn.h
+@@ -45,6 +45,7 @@ struct insn {
+ 		struct insn_field immediate2;	/* for 64bit imm or seg16 */
+ 	};
+ 
++	int	emulate_prefix_size;
+ 	insn_attr_t attr;
+ 	unsigned char opnd_bytes;
+ 	unsigned char addr_bytes;
+@@ -128,6 +129,11 @@ static inline int insn_is_evex(struct insn *insn)
+ 	return (insn->vex_prefix.nbytes == 4);
+ }
+ 
++static inline int insn_has_emulate_prefix(struct insn *insn)
++{
++	return !!insn->emulate_prefix_size;
++}
++
+ /* Ensure this instruction is decoded completely */
+ static inline int insn_complete(struct insn *insn)
+ {
+diff --git a/arch/x86/include/asm/xen/interface.h b/arch/x86/include/asm/xen/interface.h
+index 62ca03ef5c657..9139b3e863161 100644
+--- a/arch/x86/include/asm/xen/interface.h
++++ b/arch/x86/include/asm/xen/interface.h
+@@ -379,12 +379,9 @@ struct xen_pmu_arch {
+  * Prefix forces emulation of some non-trapping instructions.
+  * Currently only CPUID.
+  */
+-#ifdef __ASSEMBLY__
+-#define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ;
+-#define XEN_CPUID          XEN_EMULATE_PREFIX cpuid
+-#else
+-#define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; "
+-#define XEN_CPUID          XEN_EMULATE_PREFIX "cpuid"
+-#endif
++#include <asm/emulate_prefix.h>
++
++#define XEN_EMULATE_PREFIX __ASM_FORM(.byte __XEN_EMULATE_PREFIX ;)
++#define XEN_CPUID          XEN_EMULATE_PREFIX __ASM_FORM(cpuid)
+ 
+ #endif /* _ASM_X86_XEN_INTERFACE_H */
+diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
+index c205d77d57da3..3700dc94847c6 100644
+--- a/arch/x86/kernel/kprobes/core.c
++++ b/arch/x86/kernel/kprobes/core.c
+@@ -358,6 +358,10 @@ int __copy_instruction(u8 *dest, u8 *src, u8 *real, struct insn *insn)
+ 	kernel_insn_init(insn, dest, MAX_INSN_SIZE);
+ 	insn_get_length(insn);
+ 
++	/* We can not probe force emulate prefixed instruction */
++	if (insn_has_emulate_prefix(insn))
++		return 0;
++
+ 	/* Another subsystem puts a breakpoint, failed to recover */
+ 	if (insn->opcode.bytes[0] == BREAKPOINT_INSTRUCTION)
+ 		return 0;
+diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
+index e0e3776059af4..32561431acde0 100644
+--- a/arch/x86/kvm/pmu.c
++++ b/arch/x86/kvm/pmu.c
+@@ -143,7 +143,6 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
+ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
+ {
+ 	unsigned config, type = PERF_TYPE_RAW;
+-	u8 event_select, unit_mask;
+ 	struct kvm *kvm = pmc->vcpu->kvm;
+ 	struct kvm_pmu_event_filter *filter;
+ 	int i;
+@@ -175,17 +174,12 @@ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
+ 	if (!allow_event)
+ 		return;
+ 
+-	event_select = eventsel & ARCH_PERFMON_EVENTSEL_EVENT;
+-	unit_mask = (eventsel & ARCH_PERFMON_EVENTSEL_UMASK) >> 8;
+-
+ 	if (!(eventsel & (ARCH_PERFMON_EVENTSEL_EDGE |
+ 			  ARCH_PERFMON_EVENTSEL_INV |
+ 			  ARCH_PERFMON_EVENTSEL_CMASK |
+ 			  HSW_IN_TX |
+ 			  HSW_IN_TX_CHECKPOINTED))) {
+-		config = kvm_x86_ops->pmu_ops->find_arch_event(pmc_to_pmu(pmc),
+-						      event_select,
+-						      unit_mask);
++		config = kvm_x86_ops->pmu_ops->pmc_perf_hw_id(pmc);
+ 		if (config != PERF_COUNT_HW_MAX)
+ 			type = PERF_TYPE_HARDWARE;
+ 	}
+diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
+index 3fc98afd72a82..b63859e340e4e 100644
+--- a/arch/x86/kvm/pmu.h
++++ b/arch/x86/kvm/pmu.h
+@@ -22,8 +22,7 @@ struct kvm_event_hw_type_mapping {
+ };
+ 
+ struct kvm_pmu_ops {
+-	unsigned (*find_arch_event)(struct kvm_pmu *pmu, u8 event_select,
+-				    u8 unit_mask);
++	unsigned int (*pmc_perf_hw_id)(struct kvm_pmc *pmc);
+ 	unsigned (*find_fixed_event)(int idx);
+ 	bool (*pmc_is_enabled)(struct kvm_pmc *pmc);
+ 	struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx);
+diff --git a/arch/x86/kvm/pmu_amd.c b/arch/x86/kvm/pmu_amd.c
+index 6bc656abbe66d..799b9a3144e3b 100644
+--- a/arch/x86/kvm/pmu_amd.c
++++ b/arch/x86/kvm/pmu_amd.c
+@@ -44,6 +44,22 @@ static struct kvm_event_hw_type_mapping amd_event_mapping[] = {
+ 	[7] = { 0xd1, 0x00, PERF_COUNT_HW_STALLED_CYCLES_BACKEND },
+ };
+ 
++/* duplicated from amd_f17h_perfmon_event_map. */
++static struct kvm_event_hw_type_mapping amd_f17h_event_mapping[] = {
++	[0] = { 0x76, 0x00, PERF_COUNT_HW_CPU_CYCLES },
++	[1] = { 0xc0, 0x00, PERF_COUNT_HW_INSTRUCTIONS },
++	[2] = { 0x60, 0xff, PERF_COUNT_HW_CACHE_REFERENCES },
++	[3] = { 0x64, 0x09, PERF_COUNT_HW_CACHE_MISSES },
++	[4] = { 0xc2, 0x00, PERF_COUNT_HW_BRANCH_INSTRUCTIONS },
++	[5] = { 0xc3, 0x00, PERF_COUNT_HW_BRANCH_MISSES },
++	[6] = { 0x87, 0x02, PERF_COUNT_HW_STALLED_CYCLES_FRONTEND },
++	[7] = { 0x87, 0x01, PERF_COUNT_HW_STALLED_CYCLES_BACKEND },
++};
++
++/* amd_pmc_perf_hw_id depends on these being the same size */
++static_assert(ARRAY_SIZE(amd_event_mapping) ==
++	     ARRAY_SIZE(amd_f17h_event_mapping));
++
+ static unsigned int get_msr_base(struct kvm_pmu *pmu, enum pmu_type type)
+ {
+ 	struct kvm_vcpu *vcpu = pmu_to_vcpu(pmu);
+@@ -126,21 +142,27 @@ static inline struct kvm_pmc *get_gp_pmc_amd(struct kvm_pmu *pmu, u32 msr,
+ 	return &pmu->gp_counters[msr_to_index(msr)];
+ }
+ 
+-static unsigned amd_find_arch_event(struct kvm_pmu *pmu,
+-				    u8 event_select,
+-				    u8 unit_mask)
++static unsigned int amd_pmc_perf_hw_id(struct kvm_pmc *pmc)
+ {
++	struct kvm_event_hw_type_mapping *event_mapping;
++	u8 event_select = pmc->eventsel & ARCH_PERFMON_EVENTSEL_EVENT;
++	u8 unit_mask = (pmc->eventsel & ARCH_PERFMON_EVENTSEL_UMASK) >> 8;
+ 	int i;
+ 
++	if (guest_cpuid_family(pmc->vcpu) >= 0x17)
++		event_mapping = amd_f17h_event_mapping;
++	else
++		event_mapping = amd_event_mapping;
++
+ 	for (i = 0; i < ARRAY_SIZE(amd_event_mapping); i++)
+-		if (amd_event_mapping[i].eventsel == event_select
+-		    && amd_event_mapping[i].unit_mask == unit_mask)
++		if (event_mapping[i].eventsel == event_select
++		    && event_mapping[i].unit_mask == unit_mask)
+ 			break;
+ 
+ 	if (i == ARRAY_SIZE(amd_event_mapping))
+ 		return PERF_COUNT_HW_MAX;
+ 
+-	return amd_event_mapping[i].event_type;
++	return event_mapping[i].event_type;
+ }
+ 
+ /* return PERF_COUNT_HW_MAX as AMD doesn't have fixed events */
+@@ -300,7 +322,7 @@ static void amd_pmu_reset(struct kvm_vcpu *vcpu)
+ }
+ 
+ struct kvm_pmu_ops amd_pmu_ops = {
+-	.find_arch_event = amd_find_arch_event,
++	.pmc_perf_hw_id = amd_pmc_perf_hw_id,
+ 	.find_fixed_event = amd_find_fixed_event,
+ 	.pmc_is_enabled = amd_pmc_is_enabled,
+ 	.pmc_idx_to_pmc = amd_pmc_idx_to_pmc,
+diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
+index 181e352d38de4..395566018ba95 100644
+--- a/arch/x86/kvm/vmx/pmu_intel.c
++++ b/arch/x86/kvm/vmx/pmu_intel.c
+@@ -64,10 +64,11 @@ static void global_ctrl_changed(struct kvm_pmu *pmu, u64 data)
+ 		reprogram_counter(pmu, bit);
+ }
+ 
+-static unsigned intel_find_arch_event(struct kvm_pmu *pmu,
+-				      u8 event_select,
+-				      u8 unit_mask)
++static unsigned int intel_pmc_perf_hw_id(struct kvm_pmc *pmc)
+ {
++	struct kvm_pmu *pmu = pmc_to_pmu(pmc);
++	u8 event_select = pmc->eventsel & ARCH_PERFMON_EVENTSEL_EVENT;
++	u8 unit_mask = (pmc->eventsel & ARCH_PERFMON_EVENTSEL_UMASK) >> 8;
+ 	int i;
+ 
+ 	for (i = 0; i < ARRAY_SIZE(intel_arch_events); i++)
+@@ -374,7 +375,7 @@ static void intel_pmu_reset(struct kvm_vcpu *vcpu)
+ }
+ 
+ struct kvm_pmu_ops intel_pmu_ops = {
+-	.find_arch_event = intel_find_arch_event,
++	.pmc_perf_hw_id = intel_pmc_perf_hw_id,
+ 	.find_fixed_event = intel_find_fixed_event,
+ 	.pmc_is_enabled = intel_pmc_is_enabled,
+ 	.pmc_idx_to_pmc = intel_pmc_idx_to_pmc,
+diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
+index 1f7dfa5aa42da..6dd77e426889b 100644
+--- a/arch/x86/kvm/x86.c
++++ b/arch/x86/kvm/x86.c
+@@ -68,6 +68,7 @@
+ #include <asm/mshyperv.h>
+ #include <asm/hypervisor.h>
+ #include <asm/intel_pt.h>
++#include <asm/emulate_prefix.h>
+ #include <clocksource/hyperv_timer.h>
+ 
+ #define CREATE_TRACE_POINTS
+@@ -5583,6 +5584,7 @@ EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
+ 
+ int handle_ud(struct kvm_vcpu *vcpu)
+ {
++	static const char kvm_emulate_prefix[] = { __KVM_EMULATE_PREFIX };
+ 	int emul_type = EMULTYPE_TRAP_UD;
+ 	char sig[5]; /* ud2; .ascii "kvm" */
+ 	struct x86_exception e;
+@@ -5590,7 +5592,7 @@ int handle_ud(struct kvm_vcpu *vcpu)
+ 	if (force_emulation_prefix &&
+ 	    kvm_read_guest_virt(vcpu, kvm_get_linear_rip(vcpu),
+ 				sig, sizeof(sig), &e) == 0 &&
+-	    memcmp(sig, "\xf\xbkvm", sizeof(sig)) == 0) {
++	    memcmp(sig, kvm_emulate_prefix, sizeof(sig)) == 0) {
+ 		kvm_rip_write(vcpu, kvm_rip_read(vcpu) + sizeof(sig));
+ 		emul_type = EMULTYPE_TRAP_UD_FORCED;
+ 	}
+diff --git a/arch/x86/lib/insn.c b/arch/x86/lib/insn.c
+index 0b5862ba6a75e..404279563891a 100644
+--- a/arch/x86/lib/insn.c
++++ b/arch/x86/lib/insn.c
+@@ -13,6 +13,8 @@
+ #include <asm/inat.h>
+ #include <asm/insn.h>
+ 
++#include <asm/emulate_prefix.h>
++
+ /* Verify next sizeof(t) bytes can be on the same instruction */
+ #define validate_next(t, insn, n)	\
+ 	((insn)->next_byte + sizeof(t) + n <= (insn)->end_kaddr)
+@@ -58,6 +60,36 @@ void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64)
+ 		insn->addr_bytes = 4;
+ }
+ 
++static const insn_byte_t xen_prefix[] = { __XEN_EMULATE_PREFIX };
++static const insn_byte_t kvm_prefix[] = { __KVM_EMULATE_PREFIX };
++
++static int __insn_get_emulate_prefix(struct insn *insn,
++				     const insn_byte_t *prefix, size_t len)
++{
++	size_t i;
++
++	for (i = 0; i < len; i++) {
++		if (peek_nbyte_next(insn_byte_t, insn, i) != prefix[i])
++			goto err_out;
++	}
++
++	insn->emulate_prefix_size = len;
++	insn->next_byte += len;
++
++	return 1;
++
++err_out:
++	return 0;
++}
++
++static void insn_get_emulate_prefix(struct insn *insn)
++{
++	if (__insn_get_emulate_prefix(insn, xen_prefix, sizeof(xen_prefix)))
++		return;
++
++	__insn_get_emulate_prefix(insn, kvm_prefix, sizeof(kvm_prefix));
++}
++
+ /**
+  * insn_get_prefixes - scan x86 instruction prefix bytes
+  * @insn:	&struct insn containing instruction
+@@ -76,6 +108,8 @@ void insn_get_prefixes(struct insn *insn)
+ 	if (prefixes->got)
+ 		return;
+ 
++	insn_get_emulate_prefix(insn);
++
+ 	nb = 0;
+ 	lb = 0;
+ 	b = peek_next(insn_byte_t, insn);
+diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
+index bfb00d3b091f1..52dd517ff5419 100644
+--- a/drivers/block/drbd/drbd_nl.c
++++ b/drivers/block/drbd/drbd_nl.c
+@@ -791,9 +791,11 @@ int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
+ 	mutex_lock(&adm_ctx.resource->adm_mutex);
+ 
+ 	if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
+-		retcode = drbd_set_role(adm_ctx.device, R_PRIMARY, parms.assume_uptodate);
++		retcode = (enum drbd_ret_code)drbd_set_role(adm_ctx.device,
++						R_PRIMARY, parms.assume_uptodate);
+ 	else
+-		retcode = drbd_set_role(adm_ctx.device, R_SECONDARY, 0);
++		retcode = (enum drbd_ret_code)drbd_set_role(adm_ctx.device,
++						R_SECONDARY, 0);
+ 
+ 	mutex_unlock(&adm_ctx.resource->adm_mutex);
+ 	genl_lock();
+@@ -1971,7 +1973,7 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
+ 	drbd_flush_workqueue(&connection->sender_work);
+ 
+ 	rv = _drbd_request_state(device, NS(disk, D_ATTACHING), CS_VERBOSE);
+-	retcode = rv;  /* FIXME: Type mismatch. */
++	retcode = (enum drbd_ret_code)rv;
+ 	drbd_resume_io(device);
+ 	if (rv < SS_SUCCESS)
+ 		goto fail;
+@@ -2696,7 +2698,8 @@ int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
+ 	}
+ 	rcu_read_unlock();
+ 
+-	retcode = conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE);
++	retcode = (enum drbd_ret_code)conn_request_state(connection,
++					NS(conn, C_UNCONNECTED), CS_VERBOSE);
+ 
+ 	conn_reconfig_done(connection);
+ 	mutex_unlock(&adm_ctx.resource->adm_mutex);
+@@ -2809,7 +2812,7 @@ int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
+ 	mutex_lock(&adm_ctx.resource->adm_mutex);
+ 	rv = conn_try_disconnect(connection, parms.force_disconnect);
+ 	if (rv < SS_SUCCESS)
+-		retcode = rv;  /* FIXME: Type mismatch. */
++		retcode = (enum drbd_ret_code)rv;
+ 	else
+ 		retcode = NO_ERROR;
+ 	mutex_unlock(&adm_ctx.resource->adm_mutex);
+diff --git a/drivers/gpu/drm/amd/display/dc/gpio/gpio_service.c b/drivers/gpu/drm/amd/display/dc/gpio/gpio_service.c
+index d03165e71dc65..0be817f8cae6b 100644
+--- a/drivers/gpu/drm/amd/display/dc/gpio/gpio_service.c
++++ b/drivers/gpu/drm/amd/display/dc/gpio/gpio_service.c
+@@ -53,8 +53,8 @@
+  */
+ 
+ struct gpio_service *dal_gpio_service_create(
+-	enum dce_version dce_version_major,
+-	enum dce_version dce_version_minor,
++	enum dce_version dce_version,
++	enum dce_environment dce_environment,
+ 	struct dc_context *ctx)
+ {
+ 	struct gpio_service *service;
+@@ -67,14 +67,14 @@ struct gpio_service *dal_gpio_service_create(
+ 		return NULL;
+ 	}
+ 
+-	if (!dal_hw_translate_init(&service->translate, dce_version_major,
+-			dce_version_minor)) {
++	if (!dal_hw_translate_init(&service->translate, dce_version,
++			dce_environment)) {
+ 		BREAK_TO_DEBUGGER();
+ 		goto failure_1;
+ 	}
+ 
+-	if (!dal_hw_factory_init(&service->factory, dce_version_major,
+-			dce_version_minor)) {
++	if (!dal_hw_factory_init(&service->factory, dce_version,
++			dce_environment)) {
+ 		BREAK_TO_DEBUGGER();
+ 		goto failure_1;
+ 	}
+diff --git a/drivers/gpu/drm/amd/display/include/gpio_service_interface.h b/drivers/gpu/drm/amd/display/include/gpio_service_interface.h
+index 9c55d247227ea..7e3240e73c1fc 100644
+--- a/drivers/gpu/drm/amd/display/include/gpio_service_interface.h
++++ b/drivers/gpu/drm/amd/display/include/gpio_service_interface.h
+@@ -42,8 +42,8 @@ void dal_gpio_destroy(
+ 	struct gpio **ptr);
+ 
+ struct gpio_service *dal_gpio_service_create(
+-	enum dce_version dce_version_major,
+-	enum dce_version dce_version_minor,
++	enum dce_version dce_version,
++	enum dce_environment dce_environment,
+ 	struct dc_context *ctx);
+ 
+ struct gpio *dal_gpio_service_create_irq(
+diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+index 198a91c765314..5c21c06189c1d 100644
+--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
++++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+@@ -1452,7 +1452,7 @@ static int eb_relocate_vma(struct i915_execbuffer *eb, struct i915_vma *vma)
+ 
+ 	urelocs = u64_to_user_ptr(entry->relocs_ptr);
+ 	remain = entry->relocation_count;
+-	if (unlikely(remain > N_RELOC(ULONG_MAX)))
++	if (unlikely((unsigned long)remain > N_RELOC(ULONG_MAX)))
+ 		return -EINVAL;
+ 
+ 	/*
+diff --git a/drivers/net/can/grcan.c b/drivers/net/can/grcan.c
+index 3496dfa1b5217..e613cd5707e27 100644
+--- a/drivers/net/can/grcan.c
++++ b/drivers/net/can/grcan.c
+@@ -241,7 +241,7 @@ struct grcan_device_config {
+ 		.rxsize		= GRCAN_DEFAULT_BUFFER_SIZE,	\
+ 		}
+ 
+-#define GRCAN_TXBUG_SAFE_GRLIB_VERSION	0x4100
++#define GRCAN_TXBUG_SAFE_GRLIB_VERSION	4100
+ #define GRLIB_VERSION_MASK		0xffff
+ 
+ /* GRCAN private data structure */
+@@ -1137,7 +1137,7 @@ static int grcan_close(struct net_device *dev)
+ 	return 0;
+ }
+ 
+-static int grcan_transmit_catch_up(struct net_device *dev, int budget)
++static void grcan_transmit_catch_up(struct net_device *dev)
+ {
+ 	struct grcan_priv *priv = netdev_priv(dev);
+ 	unsigned long flags;
+@@ -1145,7 +1145,7 @@ static int grcan_transmit_catch_up(struct net_device *dev, int budget)
+ 
+ 	spin_lock_irqsave(&priv->lock, flags);
+ 
+-	work_done = catch_up_echo_skb(dev, budget, true);
++	work_done = catch_up_echo_skb(dev, -1, true);
+ 	if (work_done) {
+ 		if (!priv->resetting && !priv->closing &&
+ 		    !(priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
+@@ -1159,8 +1159,6 @@ static int grcan_transmit_catch_up(struct net_device *dev, int budget)
+ 	}
+ 
+ 	spin_unlock_irqrestore(&priv->lock, flags);
+-
+-	return work_done;
+ }
+ 
+ static int grcan_receive(struct net_device *dev, int budget)
+@@ -1242,19 +1240,13 @@ static int grcan_poll(struct napi_struct *napi, int budget)
+ 	struct net_device *dev = priv->dev;
+ 	struct grcan_registers __iomem *regs = priv->regs;
+ 	unsigned long flags;
+-	int tx_work_done, rx_work_done;
+-	int rx_budget = budget / 2;
+-	int tx_budget = budget - rx_budget;
++	int work_done;
+ 
+-	/* Half of the budget for receiveing messages */
+-	rx_work_done = grcan_receive(dev, rx_budget);
++	work_done = grcan_receive(dev, budget);
+ 
+-	/* Half of the budget for transmitting messages as that can trigger echo
+-	 * frames being received
+-	 */
+-	tx_work_done = grcan_transmit_catch_up(dev, tx_budget);
++	grcan_transmit_catch_up(dev);
+ 
+-	if (rx_work_done < rx_budget && tx_work_done < tx_budget) {
++	if (work_done < budget) {
+ 		napi_complete(napi);
+ 
+ 		/* Guarantee no interference with a running reset that otherwise
+@@ -1271,7 +1263,7 @@ static int grcan_poll(struct napi_struct *napi, int budget)
+ 		spin_unlock_irqrestore(&priv->lock, flags);
+ 	}
+ 
+-	return rx_work_done + tx_work_done;
++	return work_done;
+ }
+ 
+ /* Work tx bug by waiting while for the risky situation to clear. If that fails,
+@@ -1656,6 +1648,7 @@ exit_free_candev:
+ static int grcan_probe(struct platform_device *ofdev)
+ {
+ 	struct device_node *np = ofdev->dev.of_node;
++	struct device_node *sysid_parent;
+ 	struct resource *res;
+ 	u32 sysid, ambafreq;
+ 	int irq, err;
+@@ -1665,10 +1658,15 @@ static int grcan_probe(struct platform_device *ofdev)
+ 	/* Compare GRLIB version number with the first that does not
+ 	 * have the tx bug (see start_xmit)
+ 	 */
+-	err = of_property_read_u32(np, "systemid", &sysid);
+-	if (!err && ((sysid & GRLIB_VERSION_MASK)
+-		     >= GRCAN_TXBUG_SAFE_GRLIB_VERSION))
+-		txbug = false;
++	sysid_parent = of_find_node_by_path("/ambapp0");
++	if (sysid_parent) {
++		of_node_get(sysid_parent);
++		err = of_property_read_u32(sysid_parent, "systemid", &sysid);
++		if (!err && ((sysid & GRLIB_VERSION_MASK) >=
++			     GRCAN_TXBUG_SAFE_GRLIB_VERSION))
++			txbug = false;
++		of_node_put(sysid_parent);
++	}
+ 
+ 	err = of_property_read_u32(np, "freq", &ambafreq);
+ 	if (err) {
+diff --git a/drivers/net/ethernet/netronome/nfp/nfp_asm.c b/drivers/net/ethernet/netronome/nfp/nfp_asm.c
+index b04b83687fe21..488615434e4ae 100644
+--- a/drivers/net/ethernet/netronome/nfp/nfp_asm.c
++++ b/drivers/net/ethernet/netronome/nfp/nfp_asm.c
+@@ -196,7 +196,7 @@ int swreg_to_unrestricted(swreg dst, swreg lreg, swreg rreg,
+ 	}
+ 
+ 	reg->dst_lmextn = swreg_lmextn(dst);
+-	reg->src_lmextn = swreg_lmextn(lreg) | swreg_lmextn(rreg);
++	reg->src_lmextn = swreg_lmextn(lreg) || swreg_lmextn(rreg);
+ 
+ 	return 0;
+ }
+@@ -277,7 +277,7 @@ int swreg_to_restricted(swreg dst, swreg lreg, swreg rreg,
+ 	}
+ 
+ 	reg->dst_lmextn = swreg_lmextn(dst);
+-	reg->src_lmextn = swreg_lmextn(lreg) | swreg_lmextn(rreg);
++	reg->src_lmextn = swreg_lmextn(lreg) || swreg_lmextn(rreg);
+ 
+ 	return 0;
+ }
+diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
+index e2ed8e08cc7ad..d1cabccc02b7a 100644
+--- a/fs/proc/kcore.c
++++ b/fs/proc/kcore.c
+@@ -193,8 +193,6 @@ kclist_add_private(unsigned long pfn, unsigned long nr_pages, void *arg)
+ 		return 1;
+ 
+ 	p = pfn_to_page(pfn);
+-	if (!memmap_valid_within(pfn, p, page_zone(p)))
+-		return 1;
+ 
+ 	ent = kmalloc(sizeof(*ent), GFP_KERNEL);
+ 	if (!ent)
+diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
+index e4f9df955040f..b138ddad619e8 100644
+--- a/include/linux/mmzone.h
++++ b/include/linux/mmzone.h
+@@ -1438,37 +1438,6 @@ void memory_present(int nid, unsigned long start, unsigned long end);
+ #define pfn_valid_within(pfn) (1)
+ #endif
+ 
+-#ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
+-/*
+- * pfn_valid() is meant to be able to tell if a given PFN has valid memmap
+- * associated with it or not. This means that a struct page exists for this
+- * pfn. The caller cannot assume the page is fully initialized in general.
+- * Hotplugable pages might not have been onlined yet. pfn_to_online_page()
+- * will ensure the struct page is fully online and initialized. Special pages
+- * (e.g. ZONE_DEVICE) are never onlined and should be treated accordingly.
+- *
+- * In FLATMEM, it is expected that holes always have valid memmap as long as
+- * there is valid PFNs either side of the hole. In SPARSEMEM, it is assumed
+- * that a valid section has a memmap for the entire section.
+- *
+- * However, an ARM, and maybe other embedded architectures in the future
+- * free memmap backing holes to save memory on the assumption the memmap is
+- * never used. The page_zone linkages are then broken even though pfn_valid()
+- * returns true. A walker of the full memmap must then do this additional
+- * check to ensure the memmap they are looking at is sane by making sure
+- * the zone and PFN linkages are still valid. This is expensive, but walkers
+- * of the full memmap are extremely rare.
+- */
+-bool memmap_valid_within(unsigned long pfn,
+-					struct page *page, struct zone *zone);
+-#else
+-static inline bool memmap_valid_within(unsigned long pfn,
+-					struct page *page, struct zone *zone)
+-{
+-	return true;
+-}
+-#endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
+-
+ #endif /* !__GENERATING_BOUNDS.H */
+ #endif /* !__ASSEMBLY__ */
+ #endif /* _LINUX_MMZONE_H */
+diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
+index 14d00cc10e22e..ecad25900ad78 100644
+--- a/include/net/bluetooth/hci_core.h
++++ b/include/net/bluetooth/hci_core.h
+@@ -34,6 +34,9 @@
+ /* HCI priority */
+ #define HCI_PRIO_MAX	7
+ 
++/* HCI maximum id value */
++#define HCI_MAX_ID 10000
++
+ /* HCI Core structures */
+ struct inquiry_data {
+ 	bdaddr_t	bdaddr;
+diff --git a/mm/memory.c b/mm/memory.c
+index 8a72fd3e73bf1..d416e329442dc 100644
+--- a/mm/memory.c
++++ b/mm/memory.c
+@@ -4801,6 +4801,8 @@ long copy_huge_page_from_user(struct page *dst_page,
+ 		if (rc)
+ 			break;
+ 
++		flush_dcache_page(subpage);
++
+ 		cond_resched();
+ 	}
+ 	return ret_val;
+diff --git a/mm/migrate.c b/mm/migrate.c
+index 5092ef2aa8a1f..6948d6ec0fd03 100644
+--- a/mm/migrate.c
++++ b/mm/migrate.c
+@@ -994,9 +994,12 @@ static int move_to_new_page(struct page *newpage, struct page *page,
+ 		if (!PageMappingFlags(page))
+ 			page->mapping = NULL;
+ 
+-		if (likely(!is_zone_device_page(newpage)))
+-			flush_dcache_page(newpage);
++		if (likely(!is_zone_device_page(newpage))) {
++			int i, nr = compound_nr(newpage);
+ 
++			for (i = 0; i < nr; i++)
++				flush_dcache_page(newpage + i);
++		}
+ 	}
+ out:
+ 	return rc;
+diff --git a/mm/mmzone.c b/mm/mmzone.c
+index 4686fdc23bb96..f337831affc2d 100644
+--- a/mm/mmzone.c
++++ b/mm/mmzone.c
+@@ -72,20 +72,6 @@ struct zoneref *__next_zones_zonelist(struct zoneref *z,
+ 	return z;
+ }
+ 
+-#ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
+-bool memmap_valid_within(unsigned long pfn,
+-					struct page *page, struct zone *zone)
+-{
+-	if (page_to_pfn(page) != pfn)
+-		return false;
+-
+-	if (page_zone(page) != zone)
+-		return false;
+-
+-	return true;
+-}
+-#endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
+-
+ void lruvec_init(struct lruvec *lruvec)
+ {
+ 	enum lru_list lru;
+diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
+index 640ff2bd9a693..6fa66e2111ea7 100644
+--- a/mm/userfaultfd.c
++++ b/mm/userfaultfd.c
+@@ -53,6 +53,8 @@ static int mcopy_atomic_pte(struct mm_struct *dst_mm,
+ 			/* don't free the page */
+ 			goto out;
+ 		}
++
++		flush_dcache_page(page);
+ 	} else {
+ 		page = *pagep;
+ 		*pagep = NULL;
+@@ -572,6 +574,7 @@ retry:
+ 				err = -EFAULT;
+ 				goto out;
+ 			}
++			flush_dcache_page(page);
+ 			goto retry;
+ 		} else
+ 			BUG_ON(page);
+diff --git a/mm/vmstat.c b/mm/vmstat.c
+index a8222041bd44d..240fe2153ca9e 100644
+--- a/mm/vmstat.c
++++ b/mm/vmstat.c
+@@ -1444,10 +1444,6 @@ static void pagetypeinfo_showblockcount_print(struct seq_file *m,
+ 		if (!page)
+ 			continue;
+ 
+-		/* Watch for unexpected holes punched in the memmap */
+-		if (!memmap_valid_within(pfn, page, zone))
+-			continue;
+-
+ 		if (page_zone(page) != zone)
+ 			continue;
+ 
+diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
+index 2edaa601df13a..2ebb6480b6ecb 100644
+--- a/net/bluetooth/hci_core.c
++++ b/net/bluetooth/hci_core.c
+@@ -3304,10 +3304,10 @@ int hci_register_dev(struct hci_dev *hdev)
+ 	 */
+ 	switch (hdev->dev_type) {
+ 	case HCI_PRIMARY:
+-		id = ida_simple_get(&hci_index_ida, 0, 0, GFP_KERNEL);
++		id = ida_simple_get(&hci_index_ida, 0, HCI_MAX_ID, GFP_KERNEL);
+ 		break;
+ 	case HCI_AMP:
+-		id = ida_simple_get(&hci_index_ida, 1, 0, GFP_KERNEL);
++		id = ida_simple_get(&hci_index_ida, 1, HCI_MAX_ID, GFP_KERNEL);
+ 		break;
+ 	default:
+ 		return -EINVAL;
+@@ -3316,7 +3316,7 @@ int hci_register_dev(struct hci_dev *hdev)
+ 	if (id < 0)
+ 		return id;
+ 
+-	sprintf(hdev->name, "hci%d", id);
++	snprintf(hdev->name, sizeof(hdev->name), "hci%d", id);
+ 	hdev->id = id;
+ 
+ 	BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
+diff --git a/tools/arch/x86/include/asm/emulate_prefix.h b/tools/arch/x86/include/asm/emulate_prefix.h
+new file mode 100644
+index 0000000000000..70f5b98a52869
+--- /dev/null
++++ b/tools/arch/x86/include/asm/emulate_prefix.h
+@@ -0,0 +1,14 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++#ifndef _ASM_X86_EMULATE_PREFIX_H
++#define _ASM_X86_EMULATE_PREFIX_H
++
++/*
++ * Virt escape sequences to trigger instruction emulation;
++ * ideally these would decode to 'whole' instruction and not destroy
++ * the instruction stream; sadly this is not true for the 'kvm' one :/
++ */
++
++#define __XEN_EMULATE_PREFIX  0x0f,0x0b,0x78,0x65,0x6e  /* ud2 ; .ascii "xen" */
++#define __KVM_EMULATE_PREFIX  0x0f,0x0b,0x6b,0x76,0x6d	/* ud2 ; .ascii "kvm" */
++
++#endif
+diff --git a/tools/arch/x86/include/asm/insn.h b/tools/arch/x86/include/asm/insn.h
+index d7f0ae8f3c442..52c6262e6bfd1 100644
+--- a/tools/arch/x86/include/asm/insn.h
++++ b/tools/arch/x86/include/asm/insn.h
+@@ -45,6 +45,7 @@ struct insn {
+ 		struct insn_field immediate2;	/* for 64bit imm or seg16 */
+ 	};
+ 
++	int	emulate_prefix_size;
+ 	insn_attr_t attr;
+ 	unsigned char opnd_bytes;
+ 	unsigned char addr_bytes;
+@@ -128,6 +129,11 @@ static inline int insn_is_evex(struct insn *insn)
+ 	return (insn->vex_prefix.nbytes == 4);
+ }
+ 
++static inline int insn_has_emulate_prefix(struct insn *insn)
++{
++	return !!insn->emulate_prefix_size;
++}
++
+ /* Ensure this instruction is decoded completely */
+ static inline int insn_complete(struct insn *insn)
+ {
+diff --git a/tools/arch/x86/lib/insn.c b/tools/arch/x86/lib/insn.c
+index 79e048f1d9028..0151dfc6da616 100644
+--- a/tools/arch/x86/lib/insn.c
++++ b/tools/arch/x86/lib/insn.c
+@@ -13,6 +13,8 @@
+ #include "../include/asm/inat.h"
+ #include "../include/asm/insn.h"
+ 
++#include "../include/asm/emulate_prefix.h"
++
+ /* Verify next sizeof(t) bytes can be on the same instruction */
+ #define validate_next(t, insn, n)	\
+ 	((insn)->next_byte + sizeof(t) + n <= (insn)->end_kaddr)
+@@ -58,6 +60,36 @@ void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64)
+ 		insn->addr_bytes = 4;
+ }
+ 
++static const insn_byte_t xen_prefix[] = { __XEN_EMULATE_PREFIX };
++static const insn_byte_t kvm_prefix[] = { __KVM_EMULATE_PREFIX };
++
++static int __insn_get_emulate_prefix(struct insn *insn,
++				     const insn_byte_t *prefix, size_t len)
++{
++	size_t i;
++
++	for (i = 0; i < len; i++) {
++		if (peek_nbyte_next(insn_byte_t, insn, i) != prefix[i])
++			goto err_out;
++	}
++
++	insn->emulate_prefix_size = len;
++	insn->next_byte += len;
++
++	return 1;
++
++err_out:
++	return 0;
++}
++
++static void insn_get_emulate_prefix(struct insn *insn)
++{
++	if (__insn_get_emulate_prefix(insn, xen_prefix, sizeof(xen_prefix)))
++		return;
++
++	__insn_get_emulate_prefix(insn, kvm_prefix, sizeof(kvm_prefix));
++}
++
+ /**
+  * insn_get_prefixes - scan x86 instruction prefix bytes
+  * @insn:	&struct insn containing instruction
+@@ -76,6 +108,8 @@ void insn_get_prefixes(struct insn *insn)
+ 	if (prefixes->got)
+ 		return;
+ 
++	insn_get_emulate_prefix(insn);
++
+ 	nb = 0;
+ 	lb = 0;
+ 	b = peek_next(insn_byte_t, insn);
+diff --git a/tools/objtool/sync-check.sh b/tools/objtool/sync-check.sh
+index c3ae1e8ae1194..2a1261bfbb625 100755
+--- a/tools/objtool/sync-check.sh
++++ b/tools/objtool/sync-check.sh
+@@ -4,6 +4,7 @@
+ FILES='
+ arch/x86/include/asm/inat_types.h
+ arch/x86/include/asm/orc_types.h
++arch/x86/include/asm/emulate_prefix.h
+ arch/x86/lib/x86-opcode-map.txt
+ arch/x86/tools/gen-insn-attr-x86.awk
+ '
+@@ -46,4 +47,4 @@ done
+ check arch/x86/include/asm/inat.h     '-I "^#include [\"<]\(asm/\)*inat_types.h[\">]"'
+ check arch/x86/include/asm/insn.h     '-I "^#include [\"<]\(asm/\)*inat.h[\">]"'
+ check arch/x86/lib/inat.c             '-I "^#include [\"<]\(../include/\)*asm/insn.h[\">]"'
+-check arch/x86/lib/insn.c             '-I "^#include [\"<]\(../include/\)*asm/in\(at\|sn\).h[\">]"'
++check arch/x86/lib/insn.c             '-I "^#include [\"<]\(../include/\)*asm/in\(at\|sn\).h[\">]" -I "^#include [\"<]\(../include/\)*asm/emulate_prefix.h[\">]"'
+diff --git a/tools/perf/check-headers.sh b/tools/perf/check-headers.sh
+index cea13cb987d00..499235a411628 100755
+--- a/tools/perf/check-headers.sh
++++ b/tools/perf/check-headers.sh
+@@ -28,6 +28,7 @@ arch/x86/include/asm/disabled-features.h
+ arch/x86/include/asm/required-features.h
+ arch/x86/include/asm/cpufeatures.h
+ arch/x86/include/asm/inat_types.h
++arch/x86/include/asm/emulate_prefix.h
+ arch/x86/include/uapi/asm/prctl.h
+ arch/x86/lib/x86-opcode-map.txt
+ arch/x86/tools/gen-insn-attr-x86.awk
+@@ -116,7 +117,7 @@ check lib/ctype.c		      '-I "^EXPORT_SYMBOL" -I "^#include <linux/export.h>" -B
+ check arch/x86/include/asm/inat.h     '-I "^#include [\"<]\(asm/\)*inat_types.h[\">]"'
+ check arch/x86/include/asm/insn.h     '-I "^#include [\"<]\(asm/\)*inat.h[\">]"'
+ check arch/x86/lib/inat.c	      '-I "^#include [\"<]\(../include/\)*asm/insn.h[\">]"'
+-check arch/x86/lib/insn.c	      '-I "^#include [\"<]\(../include/\)*asm/in\(at\|sn\).h[\">]"'
++check arch/x86/lib/insn.c             '-I "^#include [\"<]\(../include/\)*asm/in\(at\|sn\).h[\">]" -I "^#include [\"<]\(../include/\)*asm/emulate_prefix.h[\">]"'
+ 
+ # diff non-symmetric files
+ check_2 tools/perf/arch/x86/entry/syscalls/syscall_64.tbl arch/x86/entry/syscalls/syscall_64.tbl