Commit f0be2600 authored by Praveen K Paladugu's avatar Praveen K Paladugu Committed by Wei Liu
Browse files

mshv: Use reboot notifier to configure sleep state 



Configure sleep state information from ACPI in MSHV hypervisor using
a reboot notifier. This data allows the hypervisor to correctly power
off the host during shutdown.

Signed-off-by: default avatarPraveen K Paladugu <prapal@linux.microsoft.com>
Co-developed-by: default avatarAnatol Belski <anbelski@linux.microsoft.com>
Signed-off-by: default avatarAnatol Belski <anbelski@linux.microsoft.com>
Reviewed-by: default avatarEaswar Hariharan <easwar.hariharan@linux.microsoft.com>
Reviewed-by: default avatarStansialv Kinsburskii <skinsburskii@linux.miscrosoft.com>
Acked-by: default avatarIngo Molnar <mingo@kernel.org>
Reviewed-by: default avatarNuno Das Neves <nunodasneves@linux.microsoft.com>
Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
parent 723c47a2

arch/x86/hyperv/hv_init.c

+1 −0
Original line number Diff line number Diff line
@@ -555,6 +555,7 @@ void __init hyperv_init(void) 


		hv_remap_tsc_clocksource();

		hv_root_crash_init();

		hv_sleep_notifiers_register();

	} else {

		hypercall_msr.guest_physical_address = vmalloc_to_pfn(hv_hypercall_pg);

		wrmsrq(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);

arch/x86/include/asm/mshyperv.h

+1 −0
Original line number Diff line number Diff line
@@ -177,6 +177,7 @@ int hyperv_flush_guest_mapping_range(u64 as, 
int hyperv_fill_flush_guest_mapping_list(

		struct hv_guest_mapping_flush_list *flush,

		u64 start_gfn, u64 end_gfn);

void hv_sleep_notifiers_register(void);



#ifdef CONFIG_X86_64

void hv_apic_init(void);

drivers/hv/mshv_common.c

+78 −0
Original line number Diff line number Diff line
@@ -14,6 +14,9 @@ 
#include <asm/mshyperv.h>

#include <linux/resume_user_mode.h>

#include <linux/export.h>

#include <linux/acpi.h>

#include <linux/notifier.h>

#include <linux/reboot.h>



#include "mshv.h"
@@ -138,3 +141,78 @@ int hv_call_get_partition_property(u64 partition_id, 
	return 0;

}

EXPORT_SYMBOL_GPL(hv_call_get_partition_property);



/*

 * Corresponding sleep states have to be initialized in order for a subsequent

 * HVCALL_ENTER_SLEEP_STATE call to succeed. Currently only S5 state as per

 * ACPI 6.4 chapter 7.4.2 is relevant, while S1, S2 and S3 can be supported.

 *

 * In order to pass proper PM values to mshv, ACPI should be initialized and

 * should support S5 sleep state when this method is invoked.

 */

static int hv_initialize_sleep_states(void)

{

	u64 status;

	unsigned long flags;

	struct hv_input_set_system_property *in;

	acpi_status acpi_status;

	u8 sleep_type_a, sleep_type_b;



	if (!acpi_sleep_state_supported(ACPI_STATE_S5)) {

		pr_err("%s: S5 sleep state not supported.\n", __func__);

		return -ENODEV;

	}



	acpi_status = acpi_get_sleep_type_data(ACPI_STATE_S5, &sleep_type_a,

					       &sleep_type_b);

	if (ACPI_FAILURE(acpi_status))

		return -ENODEV;



	local_irq_save(flags);

	in = *this_cpu_ptr(hyperv_pcpu_input_arg);

	memset(in, 0, sizeof(*in));



	in->property_id = HV_SYSTEM_PROPERTY_SLEEP_STATE;

	in->set_sleep_state_info.sleep_state = HV_SLEEP_STATE_S5;

	in->set_sleep_state_info.pm1a_slp_typ = sleep_type_a;

	in->set_sleep_state_info.pm1b_slp_typ = sleep_type_b;



	status = hv_do_hypercall(HVCALL_SET_SYSTEM_PROPERTY, in, NULL);

	local_irq_restore(flags);



	if (!hv_result_success(status)) {

		hv_status_err(status, "\n");

		return hv_result_to_errno(status);

	}



	return 0;

}



/*

 * This notifier initializes sleep states in mshv hypervisor which will be

 * used during power off.

 */

static int hv_reboot_notifier_handler(struct notifier_block *this,

				      unsigned long code, void *another)

{

	int ret = 0;



	if (code == SYS_HALT || code == SYS_POWER_OFF)

		ret = hv_initialize_sleep_states();



	return ret ? NOTIFY_DONE : NOTIFY_OK;

}



static struct notifier_block hv_reboot_notifier = {

	.notifier_call = hv_reboot_notifier_handler,

};



void hv_sleep_notifiers_register(void)

{

	int ret;



	ret = register_reboot_notifier(&hv_reboot_notifier);

	if (ret)

		pr_err("%s: cannot register reboot notifier %d\n", __func__,

		       ret);

}