From nobody Mon Dec 1 22:34:53 2025 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 729A931985E; Wed, 26 Nov 2025 21:50:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764193824; cv=none; b=bVqcFOPHcnzIZMGfOj2X6k8ewEwxpdRSoDJjxOXwQh/sHrKkk+hyhzeL4ByyWe1EyeQtnkuMlyekjeJlh7nFVIvFOFjiRDavDwgsw3tnm/7u0etZSbxNTEjN3rze1wBlo8eF7e+5LoiToBEVGlGnr7uCGAO1KR1DH01fWo/ac5A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764193824; c=relaxed/simple; bh=XuBTrLZUJQW8u2BN10oiSm1NL3GntARkryjHzFOs/28=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WFUYQYpaI1YMA0oXsxH0eyUNZycNZQjfXggCP2R6TLS63neMYeytPRl436OI1XeiaJXxuYusabOQ/pFeh8fX6/HA8/y0/ke9M9Wa6obeURzNQ4Jw4pPsp0K8sKT3iQidN0UPfe0gNxGnXZvgO/eNzII+kzKPC2yF9vymHDJ4f7s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=nh7WL7lF; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="nh7WL7lF" Received: from home (unknown [72.191.74.189]) by linux.microsoft.com (Postfix) with ESMTPSA id 836EC200E9E3; Wed, 26 Nov 2025 13:50:21 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 836EC200E9E3 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1764193822; bh=0DHq3El83KP5Hei2Xyob86CoKZ2mSX8rktDOZN6hz1Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nh7WL7lFGYqY6/qXEWv4yIuF/U9jt3P13d9XMVJfR0Jg7KN2E/eOxitb5RiFT7g8Y xVroU7tHaNRXlmRYv2w0tqbyswrYfSL9lb7pc8oCbBIIyCdXLrOHPsS1ToYW/erNCy zqGDw+FRrAaqakPFjua3JVaqhqrEXimMEfCaG/QM= From: Praveen K Paladugu To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, arnd@arndb.de Cc: anbelski@linux.microsoft.com, prapal@linux.microsoft.com, easwar.hariharan@linux.microsoft.com, nunodasneves@linux.microsoft.com, skinsburskii@linux.microsoft.com Subject: [PATCH v6 1/3] hyperv: Add definitions for MSHV sleep state configuration Date: Wed, 26 Nov 2025 15:49:51 -0600 Message-ID: <20251126215013.11549-2-prapal@linux.microsoft.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251126215013.11549-1-prapal@linux.microsoft.com> References: <20251126215013.11549-1-prapal@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add the definitions required to configure sleep states in mshv hypervsior. Signed-off-by: Praveen K Paladugu Co-developed-by: Anatol Belski Signed-off-by: Anatol Belski Reviewed-by: Easwar Hariharan Reviewed-by: Nuno Das Neves Acked-by: Stanislav Kinsburskii --- include/hyperv/hvgdk_mini.h | 4 +++- include/hyperv/hvhdk_mini.h | 40 +++++++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+), 1 deletion(-) diff --git a/include/hyperv/hvgdk_mini.h b/include/hyperv/hvgdk_mini.h index 1d5ce11be8b6..04b18d0e37af 100644 --- a/include/hyperv/hvgdk_mini.h +++ b/include/hyperv/hvgdk_mini.h @@ -465,19 +465,21 @@ union hv_vp_assist_msr_contents { /* HV_REGISTER_VP_= ASSIST_PAGE */ #define HVCALL_RESET_DEBUG_SESSION 0x006b #define HVCALL_MAP_STATS_PAGE 0x006c #define HVCALL_UNMAP_STATS_PAGE 0x006d +#define HVCALL_SET_SYSTEM_PROPERTY 0x006f #define HVCALL_ADD_LOGICAL_PROCESSOR 0x0076 #define HVCALL_GET_SYSTEM_PROPERTY 0x007b #define HVCALL_MAP_DEVICE_INTERRUPT 0x007c #define HVCALL_UNMAP_DEVICE_INTERRUPT 0x007d #define HVCALL_RETARGET_INTERRUPT 0x007e #define HVCALL_NOTIFY_PARTITION_EVENT 0x0087 +#define HVCALL_ENTER_SLEEP_STATE 0x0084 #define HVCALL_NOTIFY_PORT_RING_EMPTY 0x008b #define HVCALL_REGISTER_INTERCEPT_RESULT 0x0091 #define HVCALL_ASSERT_VIRTUAL_INTERRUPT 0x0094 #define HVCALL_CREATE_PORT 0x0095 #define HVCALL_CONNECT_PORT 0x0096 #define HVCALL_START_VP 0x0099 -#define HVCALL_GET_VP_INDEX_FROM_APIC_ID 0x009a +#define HVCALL_GET_VP_INDEX_FROM_APIC_ID 0x009a #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0 #define HVCALL_SIGNAL_EVENT_DIRECT 0x00c0 diff --git a/include/hyperv/hvhdk_mini.h b/include/hyperv/hvhdk_mini.h index f2d7b50de7a4..41a29bf8ec14 100644 --- a/include/hyperv/hvhdk_mini.h +++ b/include/hyperv/hvhdk_mini.h @@ -140,6 +140,7 @@ enum hv_snp_status { =20 enum hv_system_property { /* Add more values when needed */ + HV_SYSTEM_PROPERTY_SLEEP_STATE =3D 3, HV_SYSTEM_PROPERTY_SCHEDULER_TYPE =3D 15, HV_DYNAMIC_PROCESSOR_FEATURE_PROPERTY =3D 21, HV_SYSTEM_PROPERTY_CRASHDUMPAREA =3D 47, @@ -155,6 +156,19 @@ union hv_pfn_range { /* HV_SPA_PAGE_RANGE */ } __packed; }; =20 +enum hv_sleep_state { + HV_SLEEP_STATE_S1 =3D 1, + HV_SLEEP_STATE_S2 =3D 2, + HV_SLEEP_STATE_S3 =3D 3, + HV_SLEEP_STATE_S4 =3D 4, + HV_SLEEP_STATE_S5 =3D 5, + /* + * After hypervisor has received this, any follow up sleep + * state registration requests will be rejected. + */ + HV_SLEEP_STATE_LOCK =3D 6 +}; + enum hv_dynamic_processor_feature_property { /* Add more values when needed */ HV_X64_DYNAMIC_PROCESSOR_FEATURE_MAX_ENCRYPTED_PARTITIONS =3D 13, @@ -184,6 +198,32 @@ struct hv_output_get_system_property { }; } __packed; =20 +struct hv_sleep_state_info { + u32 sleep_state; /* enum hv_sleep_state */ + u8 pm1a_slp_typ; + u8 pm1b_slp_typ; +} __packed; + +struct hv_input_set_system_property { + u32 property_id; /* enum hv_system_property */ + u32 reserved; + union { + /* More fields to be filled in when needed */ + struct hv_sleep_state_info set_sleep_state_info; + + /* + * Add a reserved field to ensure the union is 8-byte aligned as + * existing members may not be. This is a temporary measure + * until all remaining members are added. + */ + u64 reserved0[8]; + }; +} __packed; + +struct hv_input_enter_sleep_state { /* HV_INPUT_ENTER_SLEEP_STATE */ + u32 sleep_state; /* enum hv_sleep_state */ +} __packed; + struct hv_input_map_stats_page { u32 type; /* enum hv_stats_object_type */ u32 padding; --=20 2.51.0 From nobody Mon Dec 1 22:34:53 2025 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4FE8033ADB0; Wed, 26 Nov 2025 21:50:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764193826; cv=none; b=CE5eEF4FpAPoFYxpzRRvME1WaTeLSwxhmNdnIx6TAoHAqiTnBxy9m0EhyAZ4eqrNd19bcAW713UsmMS/pqlYhn3u7k2RhWmnfwFihKtdtzNgK3fYQZwcEQh0vYB1921xzBzCD/4YET5Sxk/p07jA6yE+vy50XYUTySZXlgrdW2E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764193826; c=relaxed/simple; bh=dMDoQWDNVi87k+xnKRSJoHU214CMiZNYRQCcLpjjplk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XFjBozi9r4axRkFsRJosGq/7bXs1hTWq32Jth7IT1vd8ufWxE3HbhgBJApRZo/vNZXsJATAeeTTT4uVCglsyShTBVGjt874kTUQHVhy78dvpqCNUdLoGBUasGm2j+Ul3IrXiiffYCb4YBqPH3mU0hv8QuzxmEfU8esJaLcegKP8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=oceHPcNN; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="oceHPcNN" Received: from home (unknown [72.191.74.189]) by linux.microsoft.com (Postfix) with ESMTPSA id 4A7C3200E9E4; Wed, 26 Nov 2025 13:50:23 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 4A7C3200E9E4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1764193824; bh=WbbrakOWbo6XCX5iG68HaCpdidWSYdDGNVTWGHUuZCI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oceHPcNNYQeGKDLXao6uqEeO5ZjXFYQDfCBgZJquG5Oa3eJIPn+6Qe60ktZ85aEs4 H2awTmnc5UnquPlH+5rPlBaZNbcJ4F17ytpdbW41seg/ccili869LxKV5JMkeOkO1S NI/eXIxjU8kUpwzrq4IG4XimCNHL6Sp6RN/xEKC4= From: Praveen K Paladugu To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, arnd@arndb.de Cc: anbelski@linux.microsoft.com, prapal@linux.microsoft.com, easwar.hariharan@linux.microsoft.com, nunodasneves@linux.microsoft.com, skinsburskii@linux.microsoft.com Subject: [PATCH v6 2/3] hyperv: Use reboot notifier to configure sleep state Date: Wed, 26 Nov 2025 15:49:52 -0600 Message-ID: <20251126215013.11549-3-prapal@linux.microsoft.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251126215013.11549-1-prapal@linux.microsoft.com> References: <20251126215013.11549-1-prapal@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Configure sleep state information in mshv hypervisor. This sleep state information from ACPI will be used by hypervisor to poweroff the host. Signed-off-by: Praveen K Paladugu Co-developed-by: Anatol Belski Signed-off-by: Anatol Belski Reviewed-by: Easwar Hariharan Acked-by: Stanislav Kinsburskii --- arch/x86/hyperv/hv_init.c | 1 + arch/x86/include/asm/mshyperv.h | 2 + drivers/hv/mshv_common.c | 80 +++++++++++++++++++++++++++++++++ 3 files changed, 83 insertions(+) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index e28737ec7054..daf97a984b78 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -555,6 +555,7 @@ void __init hyperv_init(void) =20 hv_remap_tsc_clocksource(); hv_root_crash_init(); + hv_sleep_notifiers_register(); } else { hypercall_msr.guest_physical_address =3D vmalloc_to_pfn(hv_hypercall_pg); wrmsrq(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyper= v.h index 10037125099a..166053df0484 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -182,8 +182,10 @@ int hyperv_fill_flush_guest_mapping_list( void hv_apic_init(void); void __init hv_init_spinlocks(void); bool hv_vcpu_is_preempted(int vcpu); +void hv_sleep_notifiers_register(void); #else static inline void hv_apic_init(void) {} +static inline void hv_sleep_notifiers_register(void) {}; #endif =20 struct irq_domain *hv_create_pci_msi_domain(void); diff --git a/drivers/hv/mshv_common.c b/drivers/hv/mshv_common.c index aa2be51979fd..f1d4e81107ee 100644 --- a/drivers/hv/mshv_common.c +++ b/drivers/hv/mshv_common.c @@ -14,6 +14,9 @@ #include #include #include +#include +#include +#include =20 #include "mshv.h" =20 @@ -138,3 +141,80 @@ int hv_call_get_partition_property(u64 partition_id, return 0; } EXPORT_SYMBOL_GPL(hv_call_get_partition_property); + +#ifdef CONFIG_X86_64 +/* + * Corresponding sleep states have to be initialized in order for a subseq= uent + * 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 supporte= d. + * + * In order to pass proper PM values to mshv, ACPI should be initialized a= nd + * 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 =3D 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 =3D *this_cpu_ptr(hyperv_pcpu_input_arg); + memset(in, 0, sizeof(*in)); + + in->property_id =3D HV_SYSTEM_PROPERTY_SLEEP_STATE; + in->set_sleep_state_info.sleep_state =3D HV_SLEEP_STATE_S5; + in->set_sleep_state_info.pm1a_slp_typ =3D sleep_type_a; + in->set_sleep_state_info.pm1b_slp_typ =3D sleep_type_b; + + status =3D 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 =3D 0; + + if (code =3D=3D SYS_HALT || code =3D=3D SYS_POWER_OFF) + ret =3D hv_initialize_sleep_states(); + + return ret ? NOTIFY_DONE : NOTIFY_OK; +} + +static struct notifier_block hv_reboot_notifier =3D { + .notifier_call =3D hv_reboot_notifier_handler, +}; + +void hv_sleep_notifiers_register(void) +{ + int ret; + + ret =3D register_reboot_notifier(&hv_reboot_notifier); + if (ret) + pr_err("%s: cannot register reboot notifier %d\n", __func__, + ret); +} +#endif --=20 2.51.0 From nobody Mon Dec 1 22:34:53 2025 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2F64834029C; Wed, 26 Nov 2025 21:50:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764193828; cv=none; b=LZC7d58CEF4BUZOkWjwCRxCCvgbddq0qd+rbauosj+5pQ08btK/dNJZ4JYQix7bZDe2j8VTLphF+jUxmRjRrbsVfLoiA/LP5sTeuCBZGIjEBb+seNjuzHwNicvxbPnWXDfZbiyRQWDK42eF2w2ztsvrKO11sqhFQuMo5Xym8HbY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764193828; c=relaxed/simple; bh=BAtxyilWa4xLQIBc3IwlB1l52LGTfDur97nfUognJxM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kUzNDVh9EmipkvhiJu+kCCrHFSnBmIUL0ShyA3KUZVB1fxzWVI74NehjM/bQwg4wqozBCXCBvWD6HDW4He97QG03MYvlICisBYyFKFCjUMUqCaxUvHMKdUOVCoj91SiBXTsKkjoP2qMex5DG9//5iTT7F34PUTqJqf1PxBDITPE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=DX/fqn6k; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="DX/fqn6k" Received: from home (unknown [72.191.74.189]) by linux.microsoft.com (Postfix) with ESMTPSA id 30E44200E9E6; Wed, 26 Nov 2025 13:50:25 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 30E44200E9E6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1764193826; bh=zq570gQ9+2nFdOn49v1EAVlOeQpuuznKKCEbPxznxyk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DX/fqn6kX99KTkY2RM/k2fw0l4wyzj4va6HbOgdW+oBr2PNvg4VJ11JB/MH0fJNLj k9irjhRDOLmZGVjaOFy0HtwJUX3kWBSbpsnmG+DsGDm2VDoTDU/C3MICf1HzHu5Dkh 00QxkzoiX0ty/W/rWTGkRhfxLIZBuuPblXFmsyDc= From: Praveen K Paladugu To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, arnd@arndb.de Cc: anbelski@linux.microsoft.com, prapal@linux.microsoft.com, easwar.hariharan@linux.microsoft.com, nunodasneves@linux.microsoft.com, skinsburskii@linux.microsoft.com Subject: [PATCH v6 3/3] hyperv: Cleanly shutdown root partition with MSHV Date: Wed, 26 Nov 2025 15:49:53 -0600 Message-ID: <20251126215013.11549-4-prapal@linux.microsoft.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251126215013.11549-1-prapal@linux.microsoft.com> References: <20251126215013.11549-1-prapal@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When a root partition running on MSHV is powered off, the default behavior is to write ACPI registers to power-off. However, this ACPI write is intercepted by MSHV and will result in a Machine Check Exception(MCE). The root partition eventually panics with a trace similar to: [ 81.306348] reboot: Power down [ 81.314709] mce: [Hardware Error]: CPU 0: Machine Check Exception: 4 B= ank 0: b2000000c0060001 [ 81.314711] mce: [Hardware Error]: TSC 3b8cb60a66 PPIN 11d98332458e4ea9 [ 81.314713] mce: [Hardware Error]: PROCESSOR 0:606a6 TIME 1759339405 S= OCKET 0 APIC 0 microcode ffffffff [ 81.314715] mce: [Hardware Error]: Run the above through 'mcelog --asc= ii' [ 81.314716] mce: [Hardware Error]: Machine check: Processor context co= rrupt [ 81.314717] Kernel panic - not syncing: Fatal machine check To correctly shutdown a root partition running on MSHV hypervisor, sleep state information must be configured within the hypervsior. Later, the HVCALL_ENTER_SLEEP_STATE hypercall should be invoked as the last step in the shutdown sequence. The previous patch configures the sleep state information and this patch invokes HVCALL_ENTER_SLEEP_STATE hypercall to cleanly shutdown the root partition. Signed-off-by: Praveen K Paladugu Co-developed-by: Anatol Belski Signed-off-by: Anatol Belski Reviewed-by: Easwar Hariharan Acked-by: Stanislav Kinsburskii --- arch/x86/include/asm/mshyperv.h | 2 ++ arch/x86/kernel/cpu/mshyperv.c | 2 ++ drivers/hv/mshv_common.c | 18 ++++++++++++++++++ 3 files changed, 22 insertions(+) diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyper= v.h index 166053df0484..4c22f3257368 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -183,9 +183,11 @@ void hv_apic_init(void); void __init hv_init_spinlocks(void); bool hv_vcpu_is_preempted(int vcpu); void hv_sleep_notifiers_register(void); +void hv_machine_power_off(void); #else static inline void hv_apic_init(void) {} static inline void hv_sleep_notifiers_register(void) {}; +static inline void hv_machine_power_off(void) {}; #endif =20 struct irq_domain *hv_create_pci_msi_domain(void); diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index fac9953a72ef..579fb2c64cfd 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -621,6 +621,8 @@ static void __init ms_hyperv_init_platform(void) #endif =20 #if IS_ENABLED(CONFIG_HYPERV) + if (hv_root_partition()) + machine_ops.power_off =3D hv_machine_power_off; #if defined(CONFIG_KEXEC_CORE) machine_ops.shutdown =3D hv_machine_shutdown; #endif diff --git a/drivers/hv/mshv_common.c b/drivers/hv/mshv_common.c index f1d4e81107ee..28905e3ed9c0 100644 --- a/drivers/hv/mshv_common.c +++ b/drivers/hv/mshv_common.c @@ -217,4 +217,22 @@ void hv_sleep_notifiers_register(void) pr_err("%s: cannot register reboot notifier %d\n", __func__, ret); } + +/* + * Power off the machine by entering S5 sleep state via Hyper-V hypercall. + * This call does not return if successful. + */ +void hv_machine_power_off(void) +{ + unsigned long flags; + struct hv_input_enter_sleep_state *in; + + local_irq_save(flags); + in =3D *this_cpu_ptr(hyperv_pcpu_input_arg); + in->sleep_state =3D HV_SLEEP_STATE_S5; + + (void)hv_do_hypercall(HVCALL_ENTER_SLEEP_STATE, in, NULL); + local_irq_restore(flags); + +} #endif --=20 2.51.0