linux-kernel - [PATCH] x86: irq: unconditionally define KVM interrupt vectors

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Message-Id: <20240223102229.627664-1-pbonzini@redhat.com>
Date: Fri, 23 Feb 2024 05:22:29 -0500
From: Paolo Bonzini <pbonzini@...hat.com>
To: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Cc: x86@...nel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Xin Li <xin@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] x86: irq: unconditionally define KVM interrupt vectors

Unlike arch/x86/kernel/idt.c, FRED support chose to remove the #ifdefs
from the .c files and concentrate them in the headers, where unused
handlers are #define'd to NULL.

However, the constants for KVM's 3 posted interrupt vectors are still
defined conditionally in irq_vectors.h.  In the tree that FRED support was
developed on, this is innocuous because CONFIG_HAVE_KVM was effectively
always set.  With the cleanups that recently went into the KVM tree to
remove CONFIG_HAVE_KVM, the conditional became IS_ENABLED(CONFIG_KVM).
This causes a linux-next compilation failure in FRED code, when
CONFIG_KVM=n.

In preparation for the merging of FRED in Linux 6.9, define the interrupt
vector numbers unconditionally.

Cc: x86@...nel.org
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Suggested-by: Xin Li (Intel) <xin@...or.com>
Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/include/asm/irq_vectors.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
index 3f73ac3ed3a0..d18bfb238f66 100644
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -84,11 +84,9 @@
 #define HYPERVISOR_CALLBACK_VECTOR	0xf3

 /* Vector for KVM to deliver posted interrupt IPI */
-#if IS_ENABLED(CONFIG_KVM)
 #define POSTED_INTR_VECTOR		0xf2
 #define POSTED_INTR_WAKEUP_VECTOR	0xf1
 #define POSTED_INTR_NESTED_VECTOR	0xf0
-#endif

 #define MANAGED_IRQ_SHUTDOWN_VECTOR	0xef

-- 
2.39.1