[PATCH 07/26] x86/idt: Wrap KVM logic with CONFIG_KVM instead of CONFIG_HAVE_KVM

Sean Christopherson
2023-09-16T00:33:25Z

Wrap all of the IDT-related code that deals with KVM in CONFIG_KVM instead
of CONFIG_HAVE_KVM. x86 always "has" KVM, i.e. checking CONFIG_HAVE_KVM
is pointless.

Alternatively, the #ifdefs could simply be deleted, but the only potential
value is in printing the number of posted interrupts that end up being
handled by the host, everything else is completely dead code when KVM is
disabled. And if KVM is disabled, there should not be any posted
interrupts, i.e. NOT wiring up the "dummy" handlers and treating IRQs on
those vectors as spurious is the right thing to do.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/include/asm/hardirq.h | 2 +-
arch/x86/include/asm/idtentry.h | 2 +-
arch/x86/include/asm/irq.h | 2 +-
arch/x86/include/asm/irq_vectors.h | 2 +-
arch/x86/kernel/idt.c | 2 +-
arch/x86/kernel/irq.c | 4 ++--
scripts/gdb/linux/constants.py.in | 2 +-
scripts/gdb/linux/interrupts.py | 2 +-
tools/arch/x86/include/asm/irq_vectors.h | 2 +-
9 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index 66837b8c67f1..fbc7722b87d1 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -15,7 +15,7 @@ typedef struct {
unsigned int irq_spurious_count;
unsigned int icr_read_retry_count;
#endif
-#ifdef CONFIG_HAVE_KVM
+#if IS_ENABLED(CONFIG_KVM)
unsigned int kvm_posted_intr_ipis;
unsigned int kvm_posted_intr_wakeup_ipis;
unsigned int kvm_posted_intr_nested_ipis;
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index 05fd175cec7d..8eef16d0d72b 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -671,7 +671,7 @@ DECLARE_IDTENTRY_SYSVEC(IRQ_WORK_VECTOR, sysvec_irq_work);
# endif
#endif

-#ifdef CONFIG_HAVE_KVM
+#if IS_ENABLED(CONFIG_KVM)
DECLARE_IDTENTRY_SYSVEC(POSTED_INTR_VECTOR, sysvec_kvm_posted_intr_ipi);
DECLARE_IDTENTRY_SYSVEC(POSTED_INTR_WAKEUP_VECTOR, sysvec_kvm_posted_intr_wakeup_ipi);
DECLARE_IDTENTRY_SYSVEC(POSTED_INTR_NESTED_VECTOR, sysvec_kvm_posted_intr_nested_ipi);
diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h
index 836c170d3087..194dfff84cb1 100644
--- a/arch/x86/include/asm/irq.h
+++ b/arch/x86/include/asm/irq.h
@@ -29,7 +29,7 @@ struct irq_desc;

extern void fixup_irqs(void);

-#ifdef CONFIG_HAVE_KVM
+#if IS_ENABLED(CONFIG_KVM)
extern void kvm_set_posted_intr_wakeup_handler(void (*handler)(void));
#endif

diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
index 3a19904c2db6..3f73ac3ed3a0 100644
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -84,7 +84,7 @@
#define HYPERVISOR_CALLBACK_VECTOR 0xf3

/* Vector for KVM to deliver posted interrupt IPI */
-#ifdef CONFIG_HAVE_KVM
+#if IS_ENABLED(CONFIG_KVM)
#define POSTED_INTR_VECTOR 0xf2
#define POSTED_INTR_WAKEUP_VECTOR 0xf1
#define POSTED_INTR_NESTED_VECTOR 0xf0
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index b786d48f5a0f..a9e6363d88c2 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -149,7 +149,7 @@ static const __initconst struct idt_data apic_idts[] = {
#ifdef CONFIG_X86_LOCAL_APIC
INTG(LOCAL_TIMER_VECTOR, asm_sysvec_apic_timer_interrupt),
INTG(X86_PLATFORM_IPI_VECTOR, asm_sysvec_x86_platform_ipi),
-# ifdef CONFIG_HAVE_KVM
+#if IS_ENABLED(CONFIG_KVM)
INTG(POSTED_INTR_VECTOR, asm_sysvec_kvm_posted_intr_ipi),
INTG(POSTED_INTR_WAKEUP_VECTOR, asm_sysvec_kvm_posted_intr_wakeup_ipi),
INTG(POSTED_INTR_NESTED_VECTOR, asm_sysvec_kvm_posted_intr_nested_ipi),
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 11761c124545..35fde0107901 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -164,7 +164,7 @@ int arch_show_interrupts(struct seq_file *p, int prec)
#if defined(CONFIG_X86_IO_APIC)
seq_printf(p, "%*s: %10u\n", prec, "MIS", atomic_read(&irq_mis_count));
#endif
-#ifdef CONFIG_HAVE_KVM
+#if IS_ENABLED(CONFIG_KVM)
seq_printf(p, "%*s: ", prec, "PIN");
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->kvm_posted_intr_ipis);
@@ -290,7 +290,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_x86_platform_ipi)
}
#endif

-#ifdef CONFIG_HAVE_KVM
+#if IS_ENABLED(CONFIG_KVM)
static void dummy_handler(void) {}
static void (*kvm_posted_intr_wakeup_handler)(void) = dummy_handler;

diff --git a/scripts/gdb/linux/constants.py.in b/scripts/gdb/linux/constants.py.in
index e3517d4ab8ec..054630f511e0 100644
--- a/scripts/gdb/linux/constants.py.in
+++ b/scripts/gdb/linux/constants.py.in
@@ -129,7 +129,7 @@ LX_CONFIG(CONFIG_X86_MCE_THRESHOLD)
LX_CONFIG(CONFIG_X86_MCE_AMD)
LX_CONFIG(CONFIG_X86_MCE)
LX_CONFIG(CONFIG_X86_IO_APIC)
-LX_CONFIG(CONFIG_HAVE_KVM)
+LX_CONFIG(CONFIG_KVM)
LX_CONFIG(CONFIG_NUMA)
LX_CONFIG(CONFIG_ARM64)
LX_CONFIG(CONFIG_ARM64_4K_PAGES)
diff --git a/scripts/gdb/linux/interrupts.py b/scripts/gdb/linux/interrupts.py
index ef478e273791..66ae5c7690cf 100644
--- a/scripts/gdb/linux/interrupts.py
+++ b/scripts/gdb/linux/interrupts.py
@@ -151,7 +151,7 @@ def x86_show_interupts(prec):
if cnt is not None:
text += "%*s: %10u\n" % (prec, "MIS", cnt['counter'])

- if constants.LX_CONFIG_HAVE_KVM:
+ if constants.LX_CONFIG_KVM:
text += x86_show_irqstat(prec, "PIN", 'kvm_posted_intr_ipis', 'Posted-interrupt notification event')
text += x86_show_irqstat(prec, "NPI", 'kvm_posted_intr_nested_ipis', 'Nested posted-interrupt event')
text += x86_show_irqstat(prec, "PIW", 'kvm_posted_intr_wakeup_ipis', 'Posted-interrupt wakeup event')
diff --git a/tools/arch/x86/include/asm/irq_vectors.h b/tools/arch/x86/include/asm/irq_vectors.h
index 3a19904c2db6..3f73ac3ed3a0 100644
--- a/tools/arch/x86/include/asm/irq_vectors.h
+++ b/tools/arch/x86/include/asm/irq_vectors.h
@@ -84,7 +84,7 @@
#define HYPERVISOR_CALLBACK_VECTOR 0xf3

/* Vector for KVM to deliver posted interrupt IPI */
-#ifdef CONFIG_HAVE_KVM
+#if IS_ENABLED(CONFIG_KVM)
#define POSTED_INTR_VECTOR 0xf2
#define POSTED_INTR_WAKEUP_VECTOR 0xf1
#define POSTED_INTR_NESTED_VECTOR 0xf0
--
2.42.0.459.ge4e396fd5e-goog