git: b75a566d1fa8 - stable/14 - x86: Add struct ioapic_intsrc.io_valid

The branch stable/14 has been updated by cperciva:

URL: https://cgit.FreeBSD.org/src/commit/?id=b75a566d1fa800d8307a7faa50ec22c2a93145bf

commit b75a566d1fa800d8307a7faa50ec22c2a93145bf
Author:     Colin Percival <cperciva@FreeBSD.org>
AuthorDate: 2026-03-20 22:02:29 +0000
Commit:     Colin Percival <cperciva@FreeBSD.org>
CommitDate: 2026-04-16 15:11:54 +0000

    x86: Add struct ioapic_intsrc.io_valid
    
    As of this commit, io_valid is always set to 1; but a future commit
    will set it to 0, at which point IOART_INTMSET will be set to forcibly
    disable interrupt sources regardless of whether they are requested to
    be "masked".
    
    Reviewed by:    kib
    MFC after:      3 weeks
    Sponsored by:   Amazon
    Differential Revision:  https://reviews.freebsd.org/D56006
    
    (cherry picked from commit 1d0ccd61563d48e914dccf3dd5cf0280d8331ec1)
---
 sys/x86/x86/io_apic.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/sys/x86/x86/io_apic.c b/sys/x86/x86/io_apic.c
index 525547f9482a..5dd1bfc3a068 100644
--- a/sys/x86/x86/io_apic.c
+++ b/sys/x86/x86/io_apic.c
@@ -85,6 +85,7 @@ struct ioapic_intsrc {
 	u_int io_activehi:1;
 	u_int io_edgetrigger:1;
 	u_int io_masked:1;
+	u_int io_valid:1;
 	int io_bus:4;
 	uint32_t io_lowreg;
 	u_int io_remap_cookie;
@@ -193,7 +194,7 @@ _ioapic_eoi_source(struct intsrc *isrc, int locked)
 		ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(src->io_intpin),
 		    low1);
 		low1 = src->io_lowreg;
-		if (src->io_masked != 0)
+		if (src->io_masked != 0 || src->io_valid == 0)
 			low1 |= IOART_INTMSET;
 		ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(src->io_intpin),
 		    low1);
@@ -268,7 +269,9 @@ ioapic_enable_source(struct intsrc *isrc)
 
 	mtx_lock_spin(&icu_lock);
 	if (intpin->io_masked) {
-		flags = intpin->io_lowreg & ~IOART_INTMASK;
+		flags = intpin->io_lowreg;
+		if (intpin->io_valid)
+			flags &= ~IOART_INTMASK;
 		ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(intpin->io_intpin),
 		    flags);
 		intpin->io_masked = 0;
@@ -375,7 +378,7 @@ ioapic_program_intpin(struct ioapic_intsrc *intpin)
 		low |= IOART_INTAHI;
 	else
 		low |= IOART_INTALO;
-	if (intpin->io_masked)
+	if (intpin->io_masked || !intpin->io_valid)
 		low |= IOART_INTMSET;
 	switch (intpin->io_irq) {
 	case IRQ_EXTINT:
@@ -697,11 +700,13 @@ ioapic_create(vm_paddr_t addr, int32_t apic_id, int intbase)
 			intpin->io_activehi = 1;
 			intpin->io_edgetrigger = 1;
 			intpin->io_masked = 1;
+			intpin->io_valid = 1;
 		} else {
 			intpin->io_bus = APIC_BUS_PCI;
 			intpin->io_activehi = 0;
 			intpin->io_edgetrigger = 0;
 			intpin->io_masked = 1;
+			intpin->io_valid = 1;
 		}
 
 		/*
@@ -806,6 +811,7 @@ ioapic_set_nmi(void *cookie, u_int pin)
 	io->io_pins[pin].io_bus = APIC_BUS_UNKNOWN;
 	io->io_pins[pin].io_irq = IRQ_NMI;
 	io->io_pins[pin].io_masked = 0;
+	io->io_pins[pin].io_valid = 1;
 	io->io_pins[pin].io_edgetrigger = 1;
 	io->io_pins[pin].io_activehi = 1;
 	if (bootverbose)
@@ -829,6 +835,7 @@ ioapic_set_smi(void *cookie, u_int pin)
 	io->io_pins[pin].io_bus = APIC_BUS_UNKNOWN;
 	io->io_pins[pin].io_irq = IRQ_SMI;
 	io->io_pins[pin].io_masked = 0;
+	io->io_pins[pin].io_valid = 1;
 	io->io_pins[pin].io_edgetrigger = 1;
 	io->io_pins[pin].io_activehi = 1;
 	if (bootverbose)
@@ -855,6 +862,7 @@ ioapic_set_extint(void *cookie, u_int pin)
 		io->io_pins[pin].io_masked = 0;
 	else
 		io->io_pins[pin].io_masked = 1;
+	io->io_pins[pin].io_valid = 1;
 	io->io_pins[pin].io_edgetrigger = 1;
 	io->io_pins[pin].io_activehi = 1;
 	if (bootverbose)