Commit 9d7cf2c9 authored by Michael Kelley's avatar Michael Kelley Committed by Wei Liu
Browse files

Drivers: hv: Add arch independent default functions for some Hyper-V handlers 



Architecture independent Hyper-V code calls various arch-specific handlers
when needed.  To aid in supporting multiple architectures, provide weak
defaults that can be overridden by arch-specific implementations where
appropriate.  But when arch-specific overrides aren't needed or haven't
been implemented yet for a particular architecture, these stubs reduce
the amount of clutter under arch/.

No functional change.

Signed-off-by: default avatarMichael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1626287687-2045-3-git-send-email-mikelley@microsoft.com


Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
parent afca4d95

arch/x86/hyperv/hv_init.c

+0 −2
Original line number Diff line number Diff line
@@ -468,7 +468,6 @@ void hyperv_cleanup(void) 
	hypercall_msr.as_uint64 = 0;

	wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64);

}

EXPORT_SYMBOL_GPL(hyperv_cleanup);



void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die)

{
@@ -542,4 +541,3 @@ bool hv_is_isolation_supported(void) 
{

	return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE;

}
 
EXPORT_SYMBOL_GPL(hv_is_isolation_supported);

arch/x86/kernel/cpu/mshyperv.c

+0 −6
Original line number Diff line number Diff line
@@ -62,14 +62,12 @@ void hv_setup_vmbus_handler(void (*handler)(void)) 
{

	vmbus_handler = handler;

}

EXPORT_SYMBOL_GPL(hv_setup_vmbus_handler);



void hv_remove_vmbus_handler(void)

{

	/* We have no way to deallocate the interrupt gate */

	vmbus_handler = NULL;

}

EXPORT_SYMBOL_GPL(hv_remove_vmbus_handler);



/*

 * Routines to do per-architecture handling of stimer0
@@ -104,25 +102,21 @@ void hv_setup_kexec_handler(void (*handler)(void)) 
{

	hv_kexec_handler = handler;

}

EXPORT_SYMBOL_GPL(hv_setup_kexec_handler);



void hv_remove_kexec_handler(void)

{

	hv_kexec_handler = NULL;

}

EXPORT_SYMBOL_GPL(hv_remove_kexec_handler);



void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs))

{

	hv_crash_handler = handler;

}

EXPORT_SYMBOL_GPL(hv_setup_crash_handler);



void hv_remove_crash_handler(void)

{

	hv_crash_handler = NULL;

}

EXPORT_SYMBOL_GPL(hv_remove_crash_handler);



#ifdef CONFIG_KEXEC_CORE

static void hv_machine_shutdown(void)

drivers/hv/hv_common.c

+49 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/export.h>

#include <linux/bitfield.h>

#include <linux/cpumask.h>

#include <linux/ptrace.h>

#include <linux/slab.h>

#include <asm/hyperv-tlfs.h>

#include <asm/mshyperv.h>
@@ -202,3 +203,51 @@ bool hv_query_ext_cap(u64 cap_query) 
	return hv_extended_cap & cap_query;

}

EXPORT_SYMBOL_GPL(hv_query_ext_cap);



/* These __weak functions provide default "no-op" behavior and

 * may be overridden by architecture specific versions. Architectures

 * for which the default "no-op" behavior is sufficient can leave

 * them unimplemented and not be cluttered with a bunch of stub

 * functions in arch-specific code.

 */



bool __weak hv_is_isolation_supported(void)

{

	return false;

}

EXPORT_SYMBOL_GPL(hv_is_isolation_supported);



void __weak hv_setup_vmbus_handler(void (*handler)(void))

{

}

EXPORT_SYMBOL_GPL(hv_setup_vmbus_handler);



void __weak hv_remove_vmbus_handler(void)

{

}

EXPORT_SYMBOL_GPL(hv_remove_vmbus_handler);



void __weak hv_setup_kexec_handler(void (*handler)(void))

{

}

EXPORT_SYMBOL_GPL(hv_setup_kexec_handler);



void __weak hv_remove_kexec_handler(void)

{

}

EXPORT_SYMBOL_GPL(hv_remove_kexec_handler);



void __weak hv_setup_crash_handler(void (*handler)(struct pt_regs *regs))

{

}

EXPORT_SYMBOL_GPL(hv_setup_crash_handler);



void __weak hv_remove_crash_handler(void)

{

}

EXPORT_SYMBOL_GPL(hv_remove_crash_handler);



void __weak hyperv_cleanup(void)

{

}

EXPORT_SYMBOL_GPL(hyperv_cleanup);