Merge tag 'x86-urgent-2026-05-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:

 - On SEV guests, handle set_memory_{encrypted,decrypted}() failures
   more conservatively by assuming that all affected pages are
   unencrypted (Carlos López)

 - Disable broadcast TLB flush when PCID is disabled (Tom Lendacky)

 - Fix VMX vs. hrtimer_rearm_deferred() regression (Peter Zijlstra)

 - Move IRQ/NMI dispatch code from KVM into x86 core, to prepare for a
   KVM x2apic fix (Peter Zijlstra)

 - Fix incorrect munmap() size on map_vdso() failure (Guilherme Giacomo
   Simoes)

* tag 'x86-urgent-2026-05-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  virt: sev-guest: Explicitly leak pages in unknown state
  x86/mm: Disable broadcast TLB flush when PCID is disabled
  x86/kvm/vmx: Fix VMX vs hrtimer_rearm_deferred()
  x86/kvm/vmx: Move IRQ/NMI dispatch from KVM into x86 core
  x86/vdso: Fix incorrect size in munmap() on map_vdso() failure

15 files changed, 141 insertions, 72 deletions

diff --git a/arch/x86/entry/Makefile b/arch/x86/entry/Makefile
index 72cae8e0ce85..83b4762d6ecb 100644
--- a/arch/x86/entry/Makefile
+++ b/arch/x86/entry/Makefile
@@ -13,7 +13,7 @@ CFLAGS_REMOVE_syscall_64.o	= $(CC_FLAGS_FTRACE)
 CFLAGS_syscall_32.o		+= -fno-stack-protector
 CFLAGS_syscall_64.o		+= -fno-stack-protector
 
-obj-y				:= entry.o entry_$(BITS).o syscall_$(BITS).o
+obj-y				:= entry.o entry_$(BITS).o syscall_$(BITS).o common.o
 
 obj-y				+= vdso/
 obj-y				+= vsyscall/
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
new file mode 100644
index 000000000000..06c7c6ebd6f9
--- /dev/null
+++ b/arch/x86/entry/common.c
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <linux/entry-common.h>
+#include <linux/kvm_types.h>
+#include <linux/hrtimer_rearm.h>
+#include <asm/fred.h>
+#include <asm/desc.h>
+
+#if IS_ENABLED(CONFIG_KVM_INTEL)
+/*
+ * On VMX, NMIs and IRQs (as configured by KVM) are acknowledged by hardware as
+ * part of the VM-Exit, i.e. the event itself is consumed as part the VM-Exit.
+ * x86_entry_from_kvm() is invoked by KVM to effectively forward NMIs and IRQs
+ * to the kernel for servicing.  On SVM, a.k.a. AMD, the NMI/IRQ VM-Exit is
+ * purely a signal that an NMI/IRQ is pending, i.e. the event that triggered
+ * the VM-Exit is held pending until it's unblocked in the host.
+ */
+noinstr void x86_entry_from_kvm(unsigned int event_type, unsigned int vector)
+{
+	if (event_type == EVENT_TYPE_EXTINT) {
+#ifdef CONFIG_X86_64
+		/*
+		 * Use FRED dispatch, even when running IDT. The dispatch
+		 * tables are kept in sync between FRED and IDT, and the FRED
+		 * dispatch works well with CFI.
+		 */
+		fred_entry_from_kvm(event_type, vector);
+#else
+		idt_entry_from_kvm(vector);
+#endif
+		/*
+		 * Strictly speaking, only the NMI path requires noinstr.
+		 */
+		instrumentation_begin();
+		/*
+		 * KVM/VMX will dispatch from IRQ-disabled but for a context
+		 * that will have IRQs-enabled. This confuses the entry code
+		 * and it will not have reprogrammed the timer. Do so now.
+		 */
+		hrtimer_rearm_deferred();
+		instrumentation_end();
+
+		return;
+	}
+
+	WARN_ON_ONCE(event_type != EVENT_TYPE_NMI);
+
+#ifdef CONFIG_X86_64
+	if (cpu_feature_enabled(X86_FEATURE_FRED))
+		return fred_entry_from_kvm(event_type, vector);
+#endif
+
+	/*
+	 * Notably, we must use IDT dispatch for NMI when running in IDT mode.
+	 * The FRED NMI context is significantly different and will not work
+	 * right (specifically FRED fixed the NMI recursion issue).
+	 */
+	idt_entry_from_kvm(vector);
+}
+EXPORT_SYMBOL_FOR_KVM(x86_entry_from_kvm);
+#endif
diff --git a/arch/x86/entry/entry.S b/arch/x86/entry/entry.S
index 6ba2b3adcef0..a56e043b266d 100644
--- a/arch/x86/entry/entry.S
+++ b/arch/x86/entry/entry.S
@@ -75,3 +75,49 @@ THUNK warn_thunk_thunk, __warn_thunk
 #if defined(CONFIG_STACKPROTECTOR) && defined(CONFIG_SMP)
 EXPORT_SYMBOL(__ref_stack_chk_guard);
 #endif
+
+#if IS_ENABLED(CONFIG_KVM_INTEL)
+.macro IDT_DO_EVENT_IRQOFF call_insn call_target
+	/*
+	 * Unconditionally create a stack frame, getting the correct RSP on the
+	 * stack (for x86-64) would take two instructions anyways, and RBP can
+	 * be used to restore RSP to make objtool happy (see below).
+	 */
+	push %_ASM_BP
+	mov %_ASM_SP, %_ASM_BP
+
+#ifdef CONFIG_X86_64
+	/*
+	 * Align RSP to a 16-byte boundary (to emulate CPU behavior) before
+	 * creating the synthetic interrupt stack frame for the IRQ/NMI.
+	 */
+	and  $-16, %rsp
+	push $__KERNEL_DS
+	push %rbp
+#endif
+	pushf
+	push $__KERNEL_CS
+	\call_insn \call_target
+
+	/*
+	 * "Restore" RSP from RBP, even though IRET has already unwound RSP to
+	 * the correct value.  objtool doesn't know the callee will IRET and,
+	 * without the explicit restore, thinks the stack is getting walloped.
+	 * Using an unwind hint is problematic due to x86-64's dynamic alignment.
+	 */
+	leave
+	RET
+.endm
+
+.pushsection .text, "ax"
+SYM_FUNC_START(idt_do_interrupt_irqoff)
+	IDT_DO_EVENT_IRQOFF CALL_NOSPEC _ASM_ARG1
+SYM_FUNC_END(idt_do_interrupt_irqoff)
+.popsection
+
+.pushsection .noinstr.text, "ax"
+SYM_FUNC_START(idt_do_nmi_irqoff)
+	IDT_DO_EVENT_IRQOFF call asm_exc_nmi_kvm_vmx
+SYM_FUNC_END(idt_do_nmi_irqoff)
+.popsection
+#endif
diff --git a/arch/x86/entry/entry_64_fred.S b/arch/x86/entry/entry_64_fred.S
index 894f7f16eb80..0d2768ab836c 100644
--- a/arch/x86/entry/entry_64_fred.S
+++ b/arch/x86/entry/entry_64_fred.S
@@ -147,5 +147,4 @@ SYM_FUNC_START(asm_fred_entry_from_kvm)
 	RET
 
 SYM_FUNC_END(asm_fred_entry_from_kvm)
-EXPORT_SYMBOL_FOR_KVM(asm_fred_entry_from_kvm);
 #endif
diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
index a6bfcc8243cd..d903bce24f15 100644
--- a/arch/x86/entry/vdso/vma.c
+++ b/arch/x86/entry/vdso/vma.c
@@ -178,7 +178,7 @@ static int map_vdso(const struct vdso_image *image, unsigned long addr)
 	if (IS_ERR(vma)) {
 		ret = PTR_ERR(vma);
 		do_munmap(mm, text_start, image->size, NULL);
-		do_munmap(mm, addr, image->size, NULL);
+		do_munmap(mm, addr, VDSO_NR_PAGES * PAGE_SIZE, NULL);
 		goto up_fail;
 	}
 
diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h
index ec95fe44fa3a..00aeae843529 100644
--- a/arch/x86/include/asm/desc.h
+++ b/arch/x86/include/asm/desc.h
@@ -438,6 +438,10 @@ extern void idt_setup_traps(void);
 extern void idt_setup_apic_and_irq_gates(void);
 extern bool idt_is_f00f_address(unsigned long address);
 
+extern void idt_do_interrupt_irqoff(unsigned long address);
+extern void idt_do_nmi_irqoff(void);
+extern void idt_entry_from_kvm(unsigned int vector);
+
 #ifdef CONFIG_X86_64
 extern void idt_setup_early_pf(void);
 #else
diff --git a/arch/x86/include/asm/desc_defs.h b/arch/x86/include/asm/desc_defs.h
index 7e6b9314758a..2f2ce8aadf07 100644
--- a/arch/x86/include/asm/desc_defs.h
+++ b/arch/x86/include/asm/desc_defs.h
@@ -145,7 +145,7 @@ struct gate_struct {
 typedef struct gate_struct gate_desc;
 
 #ifndef _SETUP
-static inline unsigned long gate_offset(const gate_desc *g)
+static __always_inline unsigned long gate_offset(const gate_desc *g)
 {
 #ifdef CONFIG_X86_64
 	return g->offset_low | ((unsigned long)g->offset_middle << 16) |
diff --git a/arch/x86/include/asm/entry-common.h b/arch/x86/include/asm/entry-common.h
index 7535131c711b..eca24b5e07f4 100644
--- a/arch/x86/include/asm/entry-common.h
+++ b/arch/x86/include/asm/entry-common.h
@@ -97,4 +97,6 @@ static __always_inline void arch_exit_to_user_mode(void)
 }
 #define arch_exit_to_user_mode arch_exit_to_user_mode
 
+extern void x86_entry_from_kvm(unsigned int entry_type, unsigned int vector);
+
 #endif
diff --git a/arch/x86/include/asm/fred.h b/arch/x86/include/asm/fred.h
index 2bb65677c079..18a2f811c358 100644
--- a/arch/x86/include/asm/fred.h
+++ b/arch/x86/include/asm/fred.h
@@ -110,7 +110,6 @@ static __always_inline unsigned long fred_event_data(struct pt_regs *regs) { ret
 static inline void cpu_init_fred_exceptions(void) { }
 static inline void cpu_init_fred_rsps(void) { }
 static inline void fred_complete_exception_setup(void) { }
-static inline void fred_entry_from_kvm(unsigned int type, unsigned int vector) { }
 static inline void fred_sync_rsp0(unsigned long rsp0) { }
 static inline void fred_update_rsp0(void) { }
 #endif /* CONFIG_X86_FRED */
diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c
index 146f6f8b0650..99801e844b30 100644
--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -92,6 +92,7 @@ static const struct cpuid_dep cpuid_deps[] = {
 	{ X86_FEATURE_FRED,			X86_FEATURE_LKGS      },
 	{ X86_FEATURE_SPEC_CTRL_SSBD,		X86_FEATURE_SPEC_CTRL },
 	{ X86_FEATURE_LASS,			X86_FEATURE_SMAP      },
+	{ X86_FEATURE_INVLPGB,			X86_FEATURE_PCID      },
 	{}
 };
 
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index 260456588756..7bcf1decc034 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -268,6 +268,21 @@ void __init idt_setup_early_pf(void)
 }
 #endif
 
+#if IS_ENABLED(CONFIG_KVM_INTEL)
+noinstr void idt_entry_from_kvm(unsigned int vector)
+{
+	if (vector == NMI_VECTOR)
+		return idt_do_nmi_irqoff();
+
+	/*
+	 * Only the NMI path requires noinstr.
+	 */
+	instrumentation_begin();
+	idt_do_interrupt_irqoff(gate_offset(idt_table + vector));
+	instrumentation_end();
+}
+#endif
+
 static void __init idt_map_in_cea(void)
 {
 	/*
diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index 3d239ed12744..52a3afb1b79e 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -614,7 +614,6 @@ DEFINE_IDTENTRY_RAW(exc_nmi_kvm_vmx)
 {
 	exc_nmi(regs);
 }
-EXPORT_SYMBOL_FOR_KVM(asm_exc_nmi_kvm_vmx);
 #endif
 
 #ifdef CONFIG_NMI_CHECK_CPU
diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
index 8a481dae9cae..ff1f254a0ef4 100644
--- a/arch/x86/kvm/vmx/vmenter.S
+++ b/arch/x86/kvm/vmx/vmenter.S
@@ -31,38 +31,6 @@
 #define VCPU_R15	__VCPU_REGS_R15 * WORD_SIZE
 #endif
 
-.macro VMX_DO_EVENT_IRQOFF call_insn call_target
-	/*
-	 * Unconditionally create a stack frame, getting the correct RSP on the
-	 * stack (for x86-64) would take two instructions anyways, and RBP can
-	 * be used to restore RSP to make objtool happy (see below).
-	 */
-	push %_ASM_BP
-	mov %_ASM_SP, %_ASM_BP
-
-#ifdef CONFIG_X86_64
-	/*
-	 * Align RSP to a 16-byte boundary (to emulate CPU behavior) before
-	 * creating the synthetic interrupt stack frame for the IRQ/NMI.
-	 */
-	and  $-16, %rsp
-	push $__KERNEL_DS
-	push %rbp
-#endif
-	pushf
-	push $__KERNEL_CS
-	\call_insn \call_target
-
-	/*
-	 * "Restore" RSP from RBP, even though IRET has already unwound RSP to
-	 * the correct value.  objtool doesn't know the callee will IRET and,
-	 * without the explicit restore, thinks the stack is getting walloped.
-	 * Using an unwind hint is problematic due to x86-64's dynamic alignment.
-	 */
-	leave
-	RET
-.endm
-
 .section .noinstr.text, "ax"
 
 /**
@@ -320,10 +288,6 @@ SYM_INNER_LABEL_ALIGN(vmx_vmexit, SYM_L_GLOBAL)
 
 SYM_FUNC_END(__vmx_vcpu_run)
 
-SYM_FUNC_START(vmx_do_nmi_irqoff)
-	VMX_DO_EVENT_IRQOFF call asm_exc_nmi_kvm_vmx
-SYM_FUNC_END(vmx_do_nmi_irqoff)
-
 #ifndef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
 
 /**
@@ -375,13 +339,3 @@ SYM_FUNC_START(vmread_error_trampoline)
 	RET
 SYM_FUNC_END(vmread_error_trampoline)
 #endif
-
-.section .text, "ax"
-
-#ifndef CONFIG_X86_FRED
-
-SYM_FUNC_START(vmx_do_interrupt_irqoff)
-	VMX_DO_EVENT_IRQOFF CALL_NOSPEC _ASM_ARG1
-SYM_FUNC_END(vmx_do_interrupt_irqoff)
-
-#endif
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 49feecb286b2..b9103de01428 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7117,9 +7117,6 @@ void vmx_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
 	vmcs_write64(EOI_EXIT_BITMAP3, eoi_exit_bitmap[3]);
 }
 
-void vmx_do_interrupt_irqoff(unsigned long entry);
-void vmx_do_nmi_irqoff(void);
-
 static void handle_nm_fault_irqoff(struct kvm_vcpu *vcpu)
 {
 	/*
@@ -7161,17 +7158,8 @@ static void handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu,
 	    "unexpected VM-Exit interrupt info: 0x%x", intr_info))
 		return;
 
-	/*
-	 * Invoke the kernel's IRQ handler for the vector.  Use the FRED path
-	 * when it's available even if FRED isn't fully enabled, e.g. even if
-	 * FRED isn't supported in hardware, in order to avoid the indirect
-	 * CALL in the non-FRED path.
-	 */
 	kvm_before_interrupt(vcpu, KVM_HANDLING_IRQ);
-	if (IS_ENABLED(CONFIG_X86_FRED))
-		fred_entry_from_kvm(EVENT_TYPE_EXTINT, vector);
-	else
-		vmx_do_interrupt_irqoff(gate_offset((gate_desc *)host_idt_base + vector));
+	x86_entry_from_kvm(EVENT_TYPE_EXTINT, vector);
 	kvm_after_interrupt(vcpu);
 
 	vcpu->arch.at_instruction_boundary = true;
@@ -7481,10 +7469,7 @@ noinstr void vmx_handle_nmi(struct kvm_vcpu *vcpu)
 		return;
 
 	kvm_before_interrupt(vcpu, KVM_HANDLING_NMI);
-	if (cpu_feature_enabled(X86_FEATURE_FRED))
-		fred_entry_from_kvm(EVENT_TYPE_NMI, NMI_VECTOR);
-	else
-		vmx_do_nmi_irqoff();
+	x86_entry_from_kvm(EVENT_TYPE_NMI, NMI_VECTOR);
 	kvm_after_interrupt(vcpu);
 }
 
diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/sev-guest/sev-guest.c
index 910a1de0d5a7..d186ae55cf63 100644
--- a/drivers/virt/coco/sev-guest/sev-guest.c
+++ b/drivers/virt/coco/sev-guest/sev-guest.c
@@ -176,6 +176,7 @@ static int get_ext_report(struct snp_guest_dev *snp_dev, struct snp_guest_reques
 	struct snp_guest_req req = {};
 	int ret, npages = 0, resp_len;
 	sockptr_t certs_address;
+	u64 pfn;
 
 	if (sockptr_is_null(io->req_data) || sockptr_is_null(io->resp_data))
 		return -EINVAL;
@@ -215,10 +216,11 @@ static int get_ext_report(struct snp_guest_dev *snp_dev, struct snp_guest_reques
 	if (!req.certs_data)
 		return -ENOMEM;
 
+	pfn = PHYS_PFN(virt_to_phys(req.certs_data));
 	ret = set_memory_decrypted((unsigned long)req.certs_data, npages);
 	if (ret) {
 		pr_err("failed to mark page shared, ret=%d\n", ret);
-		free_pages_exact(req.certs_data, npages << PAGE_SHIFT);
+		snp_leak_pages(pfn, npages);
 		return -EFAULT;
 	}
 
@@ -272,10 +274,12 @@ e_free:
 	kfree(report_resp);
 e_free_data:
 	if (npages) {
-		if (set_memory_encrypted((unsigned long)req.certs_data, npages))
+		if (set_memory_encrypted((unsigned long)req.certs_data, npages)) {
 			WARN_ONCE(ret, "failed to restore encryption mask (leak it)\n");
-		else
+			snp_leak_pages(pfn, npages);
+		} else {
 			free_pages_exact(req.certs_data, npages << PAGE_SHIFT);
+		}
 	}
 	return ret;
 }