From nobody Tue Dec 16 07:41:28 2025 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 59D2D20010A; Fri, 5 Dec 2025 20:17:31 +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=1764965852; cv=none; b=iFjYadA/xBriq3N5/zqouBjcF3J09ktR61PEB9R0x/ZU1xQ7a7GsZsRP6IRtBlrFIe/vEVkLrH1+H9j045vVbHZY0My+AWhmZVTiA2lKviGhvHbECp4C1jvOIVyycNUcN3J6z2vcZXqcnEi0EEgnNO11dFy4pD4DT3PXCBB+vaY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764965852; c=relaxed/simple; bh=n9gV4DrpdvreX38QQ1D2a1kZySMSBZwlagGVB9JHbt8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=S8cOCYtgEjLc0MKjTGJ8jkaOCRwEy70+DjkYZXCZ7IWKdZz7EL1Bh8hluhonI0VCh5MOJWMGUbqtaAI12lNZzqssnCfpD8tC92n0a14csWcmpDhBNW+bozJPRlbbQUuuMAPKLnTi+n5+VUTbytUiMxtsq59tuiRTTV88DaXxq8I= 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=hiPmfBoc; 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="hiPmfBoc" Received: from home (unknown [72.191.74.189]) by linux.microsoft.com (Postfix) with ESMTPSA id 9A7A82116020; Fri, 5 Dec 2025 12:17:29 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 9A7A82116020 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1764965850; bh=e8rblt25W34KVLuFYTjAZnmSf2qSFyvu+2x0Oe8gFKo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hiPmfBocTm/CA0mr47LqhV10bIN2wclQHPIHwhiVt86d4XFPCSSqFDn6+t+x//5SQ HBVXHmKUCWVo18qyesCw7GtT5TRH/Un8BJpwqYfPu63ajBSzOxAk0bkwYCz09qYwVH GL0LBKMLTFcwexRAvm/iGGY1aj6hPYW4CDeu1yXY= 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 v7 1/4] fixup! Drivers: hv: Introduce mshv_vtl driver Date: Fri, 5 Dec 2025 14:17:05 -0600 Message-ID: <20251205201721.7253-2-prapal@linux.microsoft.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251205201721.7253-1-prapal@linux.microsoft.com> References: <20251205201721.7253-1-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" Drop the spurios "space" character in Makefile condition check that causes mshv_common.o to be built regardless of the CONFIG settings. Signed-off-by: Praveen K Paladugu Suggested-by: Michael Kelley --- drivers/hv/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hv/Makefile b/drivers/hv/Makefile index 58b8d07639f3..6d929fb0e13d 100644 --- a/drivers/hv/Makefile +++ b/drivers/hv/Makefile @@ -20,6 +20,6 @@ mshv_vtl-y :=3D mshv_vtl_main.o # Code that must be built-in obj-$(CONFIG_HYPERV) +=3D hv_common.o obj-$(subst m,y,$(CONFIG_MSHV_ROOT)) +=3D hv_proc.o -ifneq ($(CONFIG_MSHV_ROOT) $(CONFIG_MSHV_VTL),) +ifneq ($(CONFIG_MSHV_ROOT)$(CONFIG_MSHV_VTL),) obj-y +=3D mshv_common.o endif --=20 2.51.0 From nobody Tue Dec 16 07:41:28 2025 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id E688614A8E; Fri, 5 Dec 2025 20:17:32 +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=1764965854; cv=none; b=HEf8CWB/ZBfyLolrh86jzXvUz4R1nqzW+yfLY1hJh2fnROh3E8Cegfsg1t31L4QIT1Gb6afFSPwQ1GyY35g7acZ+mFOJXmMXgdCO+7S4ZffCHFJQKmRMhjisVAhZSy76/umai0YkE+AIWWcdp/PWN2ehe+xzIvHfxbmmneXCwfM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764965854; c=relaxed/simple; bh=NrUobtHk5U7x6sX2kK40coXoOQ57ITpJT5M19hrapgQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DBw7s/SjQS2sIw1t8NQ5Brsy+NpczkPHKIlzlWSxKZFKbBUScs+5RK0KVLX7TH/0BSZuruOz/OX9aPi3e4IjEbUGrvrksq0Kz1hRq0WsipWFQRGzvH00nktfbZacjFxSXrVjPFXhLzLwZfhqcWxaFjC4gaYLktaIwKzuTompBNo= 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=m7RlyNgZ; 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="m7RlyNgZ" Received: from home (unknown [72.191.74.189]) by linux.microsoft.com (Postfix) with ESMTPSA id 2EF6E2116022; Fri, 5 Dec 2025 12:17:31 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 2EF6E2116022 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1764965852; bh=RpWyJkAOispYpx27Qwz72E6esZ4g7bJ5EM9opNXbx+Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m7RlyNgZSJlJ61vWwmdUkuVLzV5FFoLd5xC/L1kDtMznJmKNS9sjkS4uYKOs8+MGz t8/6J5wxjGljZkDz9EP1y8n1AhfEl/qJ6YIuo3tYw4MseDby4eS3rXRokBGr+TCsgN AVjCXkvoLVE/FpGqXcvNpyd1E7FJYiMk6E7Rlo6k= 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 v7 2/4] hyperv: Add definitions for MSHV sleep state configuration Date: Fri, 5 Dec 2025 14:17:06 -0600 Message-ID: <20251205201721.7253-3-prapal@linux.microsoft.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251205201721.7253-1-prapal@linux.microsoft.com> References: <20251205201721.7253-1-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 Tue Dec 16 07:41:28 2025 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 834822D8DDF; Fri, 5 Dec 2025 20:17:34 +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=1764965856; cv=none; b=t6uIapKecEsV61a0lGQOuY89Gj28NohKCgxrhK7snqgF3k/VV/nPB4pJ+ELtuUTsbOWwZg6RyxWTcW8WQfkeJyjaOYBSH3TwpRmW8g96SicVdZiwGiP4pHSgREfuD4y0vuzmbDGNYe/fW52ax0HRU0OzBGIOhtWOezo19w/cJXQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764965856; c=relaxed/simple; bh=l5UAG+eKDS7RFbmJ/qkhj7JVtXvOkdzJ5ekUesT8pxM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BDKV5vHcaVJ3H6krdmjY3ly6kp7BO/OkY+osRm47afpTYVIJmMxK9HfksSSqA2vygVwd2Ll4W6CuTqScc8ErTwBMcKXLzaukBEudF4pIlcQ98ti8p6O94c+eRlV1JzoaMeUQwcGu4tx4ldahSDpwUJDwiR7WmlBZAMeGUiYReYI= 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=AmYTCFqZ; 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="AmYTCFqZ" Received: from home (unknown [72.191.74.189]) by linux.microsoft.com (Postfix) with ESMTPSA id C36BB2116025; Fri, 5 Dec 2025 12:17:32 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com C36BB2116025 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1764965853; bh=8aflDMUPlUIlId6bLXcwBHu5JpqbaUXHvQgoII92W/M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AmYTCFqZSvhWe2FXm9XXhSGWDim5blAZUrXAqcD9fBsaxCnRCtSnaOQPdspU4uszf Vb9kGIjQhzaJ1Hwir2z0hCdPqJa+ZjMBAFiVZPVqCh9hxINty0AngmgLZLJBwM2vZL AYktRmkp43IERWfWpzEeqqjDI4YBaZg8UvqZPe5w= 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 v7 3/4] hyperv: Use reboot notifier to configure sleep state Date: Fri, 5 Dec 2025 14:17:07 -0600 Message-ID: <20251205201721.7253-4-prapal@linux.microsoft.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251205201721.7253-1-prapal@linux.microsoft.com> References: <20251205201721.7253-1-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 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: Praveen K Paladugu Co-developed-by: Anatol Belski Signed-off-by: Anatol Belski Reviewed-by: Easwar Hariharan Reviewed-by: Stansialv Kinsburskii Acked-by: Ingo Molnar Reviewed-by: Nuno Das Neves --- arch/x86/hyperv/hv_init.c | 1 + arch/x86/include/asm/mshyperv.h | 1 + drivers/hv/mshv_common.c | 78 +++++++++++++++++++++++++++++++++ 3 files changed, 80 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..62a89debfbce 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -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); =20 #ifdef CONFIG_X86_64 void hv_apic_init(void); diff --git a/drivers/hv/mshv_common.c b/drivers/hv/mshv_common.c index aa2be51979fd..ee733ba1575e 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 +141,78 @@ 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 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); +} --=20 2.51.0 From nobody Tue Dec 16 07:41:28 2025 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 41EE12DCF6C; Fri, 5 Dec 2025 20:17:36 +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=1764965857; cv=none; b=Z8yRjOlRbw2dekJVkWYaro0SL/esyNTxWHBVfK/zE7Yn/OmnOOYQAGjpHirEGspjKU1wD70Cuq3bPuLEYMEAJDwjSQ3pblq2evjUJQ5NbypT422TlJnkZGcvj2W6Ou9e7nKQ+6+LzPF8qkUycv1nVoSJYodAdfHcFkqjw6AbEZU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764965857; c=relaxed/simple; bh=eMqUsEd2ZG8Qx42uD0+0w+LpVSuDUonTdGiSafAcRgo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aCI9tv/EvhqkekLI78XOpgFLzMylRqZzxelxK99BFuffdV2yeMtTGTmo2Mz8Z6mPvlxpzSZoOhjy7ZWG9IRsGPo/vErUtNbhxXwmDO5GiF+sR90MMzh1NorOPYztSzAhHoxj0998/yE9/J3G1PI0p0IeZqUQ5poHIH4OQP0MEKc= 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=lzUqVx7R; 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="lzUqVx7R" Received: from home (unknown [72.191.74.189]) by linux.microsoft.com (Postfix) with ESMTPSA id 93BBF2116027; Fri, 5 Dec 2025 12:17:34 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 93BBF2116027 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1764965855; bh=FzkrmiDFGiKGPB2RPNo66dLcUqDXUjjf3utqEH03Ifk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lzUqVx7RkgrEFk6xYICWgW0brcfl5zJ3ijU8dhI2qvq/gxgYCGmqnFT6iPr8Y2x6k Jq01mNv2vzS4dQnHJdnlz3JM5+j6sPxS7b2asLAHHhuGwF3/GV4IO7ztA1qzbFJdup +jILwNqIbZFl+ZVEm+ohleXEFghXMyPY2rnRP1IE= 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 v7 4/4] hyperv: Cleanly shutdown root partition with MSHV Date: Fri, 5 Dec 2025 14:17:08 -0600 Message-ID: <20251205201721.7253-5-prapal@linux.microsoft.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251205201721.7253-1-prapal@linux.microsoft.com> References: <20251205201721.7253-1-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" Root partitions running on MSHV currently attempt ACPI power-off, which MSHV intercepts and triggers a Machine Check Exception (MCE), leading to a kernel panic. Root partitions panic 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 avoid this, configure the sleep state in the hypervisor and invoke the HVCALL_ENTER_SLEEP_STATE hypercall as the final step in the shutdown sequence. This ensures a clean and safe shutdown of 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 | 1 + arch/x86/kernel/cpu/mshyperv.c | 2 ++ drivers/hv/mshv_common.c | 21 +++++++++++++++++++++ 3 files changed, 24 insertions(+) diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyper= v.h index 62a89debfbce..eef4c3a5ba28 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -178,6 +178,7 @@ 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); +void hv_machine_power_off(void); =20 #ifdef CONFIG_X86_64 void hv_apic_init(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 ee733ba1575e..58027b23c206 100644 --- a/drivers/hv/mshv_common.c +++ b/drivers/hv/mshv_common.c @@ -216,3 +216,24 @@ 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); + + /* should never reach here */ + BUG(); + +} --=20 2.51.0