diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 6b6b711..d9651f1 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -55,14 +55,14 @@ msi_set_affinity(struct irq_data *irqd, const struct cpumask *mask, bool force)
 	 * caused by the non-atomic update of the address/data pair.
 	 *
 	 * Direct update is possible when:
-	 * - The MSI is maskable (remapped MSI does not use this code path)).
-	 *   The quirk bit is not set in this case.
+	 * - The MSI is maskable (remapped MSI does not use this code path).
+	 *   The reservation mode bit is set in this case.
 	 * - The new vector is the same as the old vector
 	 * - The old vector is MANAGED_IRQ_SHUTDOWN_VECTOR (interrupt starts up)
 	 * - The interrupt is not yet started up
 	 * - The new destination CPU is the same as the old destination CPU
 	 */
-	if (!irqd_msi_nomask_quirk(irqd) ||
+	if (!irqd_can_reserve(irqd) ||
 	    cfg->vector == old_cfg.vector ||
 	    old_cfg.vector == MANAGED_IRQ_SHUTDOWN_VECTOR ||
 	    !irqd_is_started(irqd) ||
@@ -215,8 +215,6 @@ static bool x86_init_dev_msi_info(struct device *dev, struct irq_domain *domain,
 		if (WARN_ON_ONCE(domain != real_parent))
 			return false;
 		info->chip->irq_set_affinity = msi_set_affinity;
-		/* See msi_set_affinity() for the gory details */
-		info->flags |= MSI_FLAG_NOMASK_QUIRK;
 		break;
 	case DOMAIN_BUS_DMAR:
 	case DOMAIN_BUS_AMDVI:
diff --git a/include/linux/irq.h b/include/linux/irq.h
index d8a6fdc..90081af 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -215,8 +215,6 @@ struct irq_data {
  * IRQD_SINGLE_TARGET		- IRQ allows only a single affinity target
  * IRQD_DEFAULT_TRIGGER_SET	- Expected trigger already been set
  * IRQD_CAN_RESERVE		- Can use reservation mode
- * IRQD_MSI_NOMASK_QUIRK	- Non-maskable MSI quirk for affinity change
- *				  required
  * IRQD_HANDLE_ENFORCE_IRQCTX	- Enforce that handle_irq_*() is only invoked
  *				  from actual interrupt context.
  * IRQD_AFFINITY_ON_ACTIVATE	- Affinity is set on activation. Don't call
@@ -247,11 +245,10 @@ enum {
 	IRQD_SINGLE_TARGET		= BIT(24),
 	IRQD_DEFAULT_TRIGGER_SET	= BIT(25),
 	IRQD_CAN_RESERVE		= BIT(26),
-	IRQD_MSI_NOMASK_QUIRK		= BIT(27),
-	IRQD_HANDLE_ENFORCE_IRQCTX	= BIT(28),
-	IRQD_AFFINITY_ON_ACTIVATE	= BIT(29),
-	IRQD_IRQ_ENABLED_ON_SUSPEND	= BIT(30),
-	IRQD_RESEND_WHEN_IN_PROGRESS    = BIT(31),
+	IRQD_HANDLE_ENFORCE_IRQCTX	= BIT(27),
+	IRQD_AFFINITY_ON_ACTIVATE	= BIT(28),
+	IRQD_IRQ_ENABLED_ON_SUSPEND	= BIT(29),
+	IRQD_RESEND_WHEN_IN_PROGRESS    = BIT(30),
 };
 
 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
@@ -426,21 +423,6 @@ static inline bool irqd_can_reserve(struct irq_data *d)
 	return __irqd_to_state(d) & IRQD_CAN_RESERVE;
 }
 
-static inline void irqd_set_msi_nomask_quirk(struct irq_data *d)
-{
-	__irqd_to_state(d) |= IRQD_MSI_NOMASK_QUIRK;
-}
-
-static inline void irqd_clr_msi_nomask_quirk(struct irq_data *d)
-{
-	__irqd_to_state(d) &= ~IRQD_MSI_NOMASK_QUIRK;
-}
-
-static inline bool irqd_msi_nomask_quirk(struct irq_data *d)
-{
-	return __irqd_to_state(d) & IRQD_MSI_NOMASK_QUIRK;
-}
-
 static inline void irqd_set_affinity_on_activate(struct irq_data *d)
 {
 	__irqd_to_state(d) |= IRQD_AFFINITY_ON_ACTIVATE;
diff --git a/include/linux/msi.h b/include/linux/msi.h
index a50ea79..ddace8c 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -547,12 +547,6 @@ enum {
 	MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS	= (1 << 5),
 	/* Free MSI descriptors */
 	MSI_FLAG_FREE_MSI_DESCS		= (1 << 6),
-	/*
-	 * Quirk to handle MSI implementations which do not provide
-	 * masking. Currently known to affect x86, but has to be partially
-	 * handled in the core MSI code.
-	 */
-	MSI_FLAG_NOMASK_QUIRK		= (1 << 7),
 
 	/* Mask for the generic functionality */
 	MSI_GENERIC_FLAGS_MASK		= GENMASK(15, 0),
diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c
index 5971a66..aae0402 100644
--- a/kernel/irq/debugfs.c
+++ b/kernel/irq/debugfs.c
@@ -121,7 +121,6 @@ static const struct irq_bit_descr irqdata_states[] = {
 	BIT_MASK_DESCR(IRQD_AFFINITY_ON_ACTIVATE),
 	BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN),
 	BIT_MASK_DESCR(IRQD_CAN_RESERVE),
-	BIT_MASK_DESCR(IRQD_MSI_NOMASK_QUIRK),
 
 	BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU),
 
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index b4c31a5..79b4a58 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -1204,7 +1204,6 @@ static int msi_handle_pci_fail(struct irq_domain *domain, struct msi_desc *desc,
 
 #define VIRQ_CAN_RESERVE	0x01
 #define VIRQ_ACTIVATE		0x02
-#define VIRQ_NOMASK_QUIRK	0x04
 
 static int msi_init_virq(struct irq_domain *domain, int virq, unsigned int vflags)
 {
@@ -1213,8 +1212,6 @@ static int msi_init_virq(struct irq_domain *domain, int virq, unsigned int vflag
 
 	if (!(vflags & VIRQ_CAN_RESERVE)) {
 		irqd_clr_can_reserve(irqd);
-		if (vflags & VIRQ_NOMASK_QUIRK)
-			irqd_set_msi_nomask_quirk(irqd);
 
 		/*
 		 * If the interrupt is managed but no CPU is available to
@@ -1275,15 +1272,8 @@ static int __msi_domain_alloc_irqs(struct device *dev, struct irq_domain *domain
 	 * Interrupt can use a reserved vector and will not occupy
 	 * a real device vector until the interrupt is requested.
 	 */
-	if (msi_check_reservation_mode(domain, info, dev)) {
+	if (msi_check_reservation_mode(domain, info, dev))
 		vflags |= VIRQ_CAN_RESERVE;
-		/*
-		 * MSI affinity setting requires a special quirk (X86) when
-		 * reservation mode is active.
-		 */
-		if (info->flags & MSI_FLAG_NOMASK_QUIRK)
-			vflags |= VIRQ_NOMASK_QUIRK;
-	}
 
 	xa_for_each_range(xa, idx, desc, ctrl->first, ctrl->last) {
 		if (!msi_desc_match(desc, MSI_DESC_NOTASSOCIATED))
