Merge branch 'WIP.x86/asm' into x86/urgent, because the topic is ready

Signed-off-by: Ingo Molnar <mingo@kernel.org>

10 files changed, 76 insertions, 29 deletions

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
index 03f195025390..204bdb9857b9 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
@@ -406,8 +406,9 @@
 	wlan_pd_n: wlan-pd-n {
 		compatible = "regulator-fixed";
 		regulator-name = "wlan_pd_n";
+		pinctrl-names = "default";
+		pinctrl-0 = <&wlan_module_reset_l>;
 
-		/* Note the wlan_module_reset_l pinctrl */
 		enable-active-high;
 		gpio = <&gpio1 11 GPIO_ACTIVE_HIGH>;
 
@@ -983,12 +984,6 @@ ap_i2c_audio: &i2c8 {
 	pinctrl-0 = <
 		&ap_pwroff	/* AP will auto-assert this when in S3 */
 		&clk_32k	/* This pin is always 32k on gru boards */
-
-		/*
-		 * We want this driven low ASAP; firmware should help us, but
-		 * we can help ourselves too.
-		 */
-		&wlan_module_reset_l
 	>;
 
 	pcfg_output_low: pcfg-output-low {
@@ -1168,12 +1163,7 @@ ap_i2c_audio: &i2c8 {
 		};
 
 		wlan_module_reset_l: wlan-module-reset-l {
-			/*
-			 * We want this driven low ASAP (As {Soon,Strongly} As
-			 * Possible), to avoid leakage through the powered-down
-			 * WiFi.
-			 */
-			rockchip,pins = <1 11 RK_FUNC_GPIO &pcfg_output_low>;
+			rockchip,pins = <1 11 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
 
 		bt_host_wake_l: bt-host-wake-l {
diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
index 2605118d4b4c..0b81ca1d07e7 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
@@ -411,8 +411,8 @@
 			reg = <0x0 0xfe800000 0x0 0x100000>;
 			interrupts = <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH 0>;
 			dr_mode = "otg";
-			phys = <&u2phy0_otg>, <&tcphy0_usb3>;
-			phy-names = "usb2-phy", "usb3-phy";
+			phys = <&u2phy0_otg>;
+			phy-names = "usb2-phy";
 			phy_type = "utmi_wide";
 			snps,dis_enblslpm_quirk;
 			snps,dis-u2-freeclk-exists-quirk;
@@ -444,8 +444,8 @@
 			reg = <0x0 0xfe900000 0x0 0x100000>;
 			interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH 0>;
 			dr_mode = "otg";
-			phys = <&u2phy1_otg>, <&tcphy1_usb3>;
-			phy-names = "usb2-phy", "usb3-phy";
+			phys = <&u2phy1_otg>;
+			phy-names = "usb2-phy";
 			phy_type = "utmi_wide";
 			snps,dis_enblslpm_quirk;
 			snps,dis-u2-freeclk-exists-quirk;
diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h
index 8389050328bb..192d791f1103 100644
--- a/arch/arm64/include/asm/efi.h
+++ b/arch/arm64/include/asm/efi.h
@@ -31,7 +31,7 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
 ({									\
 	efi_##f##_t *__f;						\
 	__f = p->f;							\
-	__f(args);							\
+	__efi_rt_asm_wrapper(__f, #f, args);				\
 })
 
 #define arch_efi_call_virt_teardown()					\
@@ -40,6 +40,8 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
 	efi_virtmap_unload();						\
 })
 
+efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...);
+
 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
 
 /* arch specific definitions used by the stub code */
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index b87541360f43..6a4bd80c75bd 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -38,7 +38,8 @@ arm64-obj-$(CONFIG_CPU_PM)		+= sleep.o suspend.o
 arm64-obj-$(CONFIG_CPU_IDLE)		+= cpuidle.o
 arm64-obj-$(CONFIG_JUMP_LABEL)		+= jump_label.o
 arm64-obj-$(CONFIG_KGDB)		+= kgdb.o
-arm64-obj-$(CONFIG_EFI)			+= efi.o efi-entry.stub.o
+arm64-obj-$(CONFIG_EFI)			+= efi.o efi-entry.stub.o		\
+					   efi-rt-wrapper.o
 arm64-obj-$(CONFIG_PCI)			+= pci.o
 arm64-obj-$(CONFIG_ARMV8_DEPRECATED)	+= armv8_deprecated.o
 arm64-obj-$(CONFIG_ACPI)		+= acpi.o
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index 52f15cd896e1..b5a28336c077 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -178,7 +178,7 @@ static int enable_smccc_arch_workaround_1(void *data)
 	case PSCI_CONDUIT_HVC:
 		arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
 				  ARM_SMCCC_ARCH_WORKAROUND_1, &res);
-		if (res.a0)
+		if ((int)res.a0 < 0)
 			return 0;
 		cb = call_hvc_arch_workaround_1;
 		smccc_start = __smccc_workaround_1_hvc_start;
@@ -188,7 +188,7 @@ static int enable_smccc_arch_workaround_1(void *data)
 	case PSCI_CONDUIT_SMC:
 		arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
 				  ARM_SMCCC_ARCH_WORKAROUND_1, &res);
-		if (res.a0)
+		if ((int)res.a0 < 0)
 			return 0;
 		cb = call_smc_arch_workaround_1;
 		smccc_start = __smccc_workaround_1_smc_start;
diff --git a/arch/arm64/kernel/efi-rt-wrapper.S b/arch/arm64/kernel/efi-rt-wrapper.S
new file mode 100644
index 000000000000..05235ebb336d
--- /dev/null
+++ b/arch/arm64/kernel/efi-rt-wrapper.S
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+
+ENTRY(__efi_rt_asm_wrapper)
+	stp	x29, x30, [sp, #-32]!
+	mov	x29, sp
+
+	/*
+	 * Register x18 is designated as the 'platform' register by the AAPCS,
+	 * which means firmware running at the same exception level as the OS
+	 * (such as UEFI) should never touch it.
+	 */
+	stp	x1, x18, [sp, #16]
+
+	/*
+	 * We are lucky enough that no EFI runtime services take more than
+	 * 5 arguments, so all are passed in registers rather than via the
+	 * stack.
+	 */
+	mov	x8, x0
+	mov	x0, x2
+	mov	x1, x3
+	mov	x2, x4
+	mov	x3, x5
+	mov	x4, x6
+	blr	x8
+
+	ldp	x1, x2, [sp, #16]
+	cmp	x2, x18
+	ldp	x29, x30, [sp], #32
+	b.ne	0f
+	ret
+0:	b	efi_handle_corrupted_x18	// tail call
+ENDPROC(__efi_rt_asm_wrapper)
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index a8bf1c892b90..4f9acb5fbe97 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -126,3 +126,9 @@ bool efi_poweroff_required(void)
 {
 	return efi_enabled(EFI_RUNTIME_SERVICES);
 }
+
+asmlinkage efi_status_t efi_handle_corrupted_x18(efi_status_t s, const char *f)
+{
+	pr_err_ratelimited(FW_BUG "register x18 corrupted by EFI %s\n", f);
+	return s;
+}
diff --git a/arch/arm64/kernel/sys.c b/arch/arm64/kernel/sys.c
index 26fe8ea93ea2..72981bae10eb 100644
--- a/arch/arm64/kernel/sys.c
+++ b/arch/arm64/kernel/sys.c
@@ -34,7 +34,7 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
 	if (offset_in_page(off) != 0)
 		return -EINVAL;
 
-	return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
+	return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 }
 
 SYSCALL_DEFINE1(arm64_personality, unsigned int, personality)
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index d7e3299a7734..959e50d2588c 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -363,8 +363,6 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 {
 	int ret = 0;
 
-	vcpu_load(vcpu);
-
 	trace_kvm_set_guest_debug(vcpu, dbg->control);
 
 	if (dbg->control & ~KVM_GUESTDBG_VALID_MASK) {
@@ -386,7 +384,6 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 	}
 
 out:
-	vcpu_put(vcpu);
 	return ret;
 }
 
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 84a019f55022..2dbb2c9f1ec1 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -108,7 +108,7 @@ static bool pgattr_change_is_safe(u64 old, u64 new)
 	 * The following mapping attributes may be updated in live
 	 * kernel mappings without the need for break-before-make.
 	 */
-	static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE;
+	static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE | PTE_NG;
 
 	/* creating or taking down mappings is always safe */
 	if (old == 0 || new == 0)
@@ -118,9 +118,9 @@ static bool pgattr_change_is_safe(u64 old, u64 new)
 	if ((old | new) & PTE_CONT)
 		return false;
 
-	/* Transitioning from Global to Non-Global is safe */
-	if (((old ^ new) == PTE_NG) && (new & PTE_NG))
-		return true;
+	/* Transitioning from Non-Global to Global is unsafe */
+	if (old & ~new & PTE_NG)
+		return false;
 
 	return ((old ^ new) & ~mask) == 0;
 }
@@ -972,3 +972,13 @@ int pmd_clear_huge(pmd_t *pmdp)
 	pmd_clear(pmdp);
 	return 1;
 }
+
+int pud_free_pmd_page(pud_t *pud)
+{
+	return pud_none(*pud);
+}
+
+int pmd_free_pte_page(pmd_t *pmd)
+{
+	return pmd_none(*pmd);
+}