[PATCH v5 08/10] x86: hyperv: Add mshv_handler irq handler and setup function

Nuno Das Neves
2025-02-26T23:09:00Z

This will handle SYNIC interrupts such as intercepts, doorbells, and
scheduling messages intended for the mshv driver.

Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Reviewed-by: Wei Liu <wei.liu@kernel.org>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
---
arch/x86/kernel/cpu/mshyperv.c | 9 +++++++++
drivers/hv/hv_common.c | 5 +++++
include/asm-generic/mshyperv.h | 1 +
3 files changed, 15 insertions(+)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 0116d0e96ef9..616e9a5d77b4 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -107,6 +107,7 @@ void hv_set_msr(unsigned int reg, u64 value)
}
EXPORT_SYMBOL_GPL(hv_set_msr);

+static void (*mshv_handler)(void);
static void (*vmbus_handler)(void);
static void (*hv_stimer0_handler)(void);
static void (*hv_kexec_handler)(void);
@@ -117,6 +118,9 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_hyperv_callback)
struct pt_regs *old_regs = set_irq_regs(regs);

inc_irq_stat(irq_hv_callback_count);
+ if (mshv_handler)
+ mshv_handler();
+
if (vmbus_handler)
vmbus_handler();

@@ -126,6 +130,11 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_hyperv_callback)
set_irq_regs(old_regs);
}

+void hv_setup_mshv_handler(void (*handler)(void))
+{
+ mshv_handler = handler;
+}
+
void hv_setup_vmbus_handler(void (*handler)(void))
{
vmbus_handler = handler;
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 2763cb6d3678..f5a07fd9a03b 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -677,6 +677,11 @@ void __weak hv_remove_vmbus_handler(void)
}
EXPORT_SYMBOL_GPL(hv_remove_vmbus_handler);

+void __weak hv_setup_mshv_handler(void (*handler)(void))
+{
+}
+EXPORT_SYMBOL_GPL(hv_setup_mshv_handler);
+
void __weak hv_setup_kexec_handler(void (*handler)(void))
{
}
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 1f46d19a16aa..a05f12e63ccd 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -208,6 +208,7 @@ void hv_setup_kexec_handler(void (*handler)(void));
void hv_remove_kexec_handler(void);
void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
void hv_remove_crash_handler(void);
+void hv_setup_mshv_handler(void (*handler)(void));

extern int vmbus_interrupt;
extern int vmbus_irq;
--
2.34.1