Commit e2575ffe authored by Nuno Das Neves's avatar Nuno Das Neves Committed by Wei Liu
Browse files

x86: hyperv: Add mshv_handler() irq handler and setup function 



Add mshv_handler() to process messages related to managing guest
partitions such as intercepts, doorbells, and scheduling messages.

In a (non-nested) root partition, the same interrupt vector is shared
between the vmbus and mshv_root drivers.

Introduce a stub for mshv_handler() and call it in
sysvec_hyperv_callback alongside vmbus_handler().

Even though both handlers will be called for every Hyper-V interrupt,
the messages for each driver are delivered to different offsets
within the SYNIC message page, so they won't step on each other.

Signed-off-by: default avatarNuno Das Neves <nunodasneves@linux.microsoft.com>
Reviewed-by: default avatarWei Liu <wei.liu@kernel.org>
Reviewed-by: default avatarTianyu Lan <tiala@microsoft.com>
Reviewed-by: default avatarStanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Link: https://lore.kernel.org/r/1741980536-3865-9-git-send-email-nunodasneves@linux.microsoft.com


Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
Message-ID: <1741980536-3865-9-git-send-email-nunodasneves@linux.microsoft.com>
parent 04df7ac3

arch/x86/kernel/cpu/mshyperv.c

+9 −0
Original line number Diff line number Diff line
@@ -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;

drivers/hv/hv_common.c

+5 −0
Original line number Diff line number Diff line
@@ -680,6 +680,11 @@ 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))

{

}

include/asm-generic/mshyperv.h

+1 −0
Original line number Diff line number Diff line
@@ -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;