Adding upstream version 6.9.7.upstream/6.9.7

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 148 insertions, 86 deletions

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 51e5018ac9..a8ad728354 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -270,7 +270,7 @@ void hv_synic_enable_regs(unsigned int cpu)
 	union hv_synic_scontrol sctrl;
 
 	/* Setup the Synic's message page */
-	simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP);
+	simp.as_uint64 = hv_get_msr(HV_MSR_SIMP);
 	simp.simp_enabled = 1;
 
 	if (ms_hyperv.paravisor_present || hv_root_partition) {
@@ -286,10 +286,10 @@ void hv_synic_enable_regs(unsigned int cpu)
 			>> HV_HYP_PAGE_SHIFT;
 	}
 
-	hv_set_register(HV_REGISTER_SIMP, simp.as_uint64);
+	hv_set_msr(HV_MSR_SIMP, simp.as_uint64);
 
 	/* Setup the Synic's event page */
-	siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP);
+	siefp.as_uint64 = hv_get_msr(HV_MSR_SIEFP);
 	siefp.siefp_enabled = 1;
 
 	if (ms_hyperv.paravisor_present || hv_root_partition) {
@@ -305,13 +305,12 @@ void hv_synic_enable_regs(unsigned int cpu)
 			>> HV_HYP_PAGE_SHIFT;
 	}
 
-	hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);
+	hv_set_msr(HV_MSR_SIEFP, siefp.as_uint64);
 
 	/* Setup the shared SINT. */
 	if (vmbus_irq != -1)
 		enable_percpu_irq(vmbus_irq, 0);
-	shared_sint.as_uint64 = hv_get_register(HV_REGISTER_SINT0 +
-					VMBUS_MESSAGE_SINT);
+	shared_sint.as_uint64 = hv_get_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT);
 
 	shared_sint.vector = vmbus_interrupt;
 	shared_sint.masked = false;
@@ -326,14 +325,13 @@ void hv_synic_enable_regs(unsigned int cpu)
 #else
 	shared_sint.auto_eoi = 0;
 #endif
-	hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT,
-				shared_sint.as_uint64);
+	hv_set_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
 
 	/* Enable the global synic bit */
-	sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL);
+	sctrl.as_uint64 = hv_get_msr(HV_MSR_SCONTROL);
 	sctrl.enable = 1;
 
-	hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
+	hv_set_msr(HV_MSR_SCONTROL, sctrl.as_uint64);
 }
 
 int hv_synic_init(unsigned int cpu)
@@ -357,17 +355,15 @@ void hv_synic_disable_regs(unsigned int cpu)
 	union hv_synic_siefp siefp;
 	union hv_synic_scontrol sctrl;
 
-	shared_sint.as_uint64 = hv_get_register(HV_REGISTER_SINT0 +
-					VMBUS_MESSAGE_SINT);
+	shared_sint.as_uint64 = hv_get_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT);
 
 	shared_sint.masked = 1;
 
 	/* Need to correctly cleanup in the case of SMP!!! */
 	/* Disable the interrupt */
-	hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT,
-				shared_sint.as_uint64);
+	hv_set_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
 
-	simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP);
+	simp.as_uint64 = hv_get_msr(HV_MSR_SIMP);
 	/*
 	 * In Isolation VM, sim and sief pages are allocated by
 	 * paravisor. These pages also will be used by kdump
@@ -382,9 +378,9 @@ void hv_synic_disable_regs(unsigned int cpu)
 		simp.base_simp_gpa = 0;
 	}
 
-	hv_set_register(HV_REGISTER_SIMP, simp.as_uint64);
+	hv_set_msr(HV_MSR_SIMP, simp.as_uint64);
 
-	siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP);
+	siefp.as_uint64 = hv_get_msr(HV_MSR_SIEFP);
 	siefp.siefp_enabled = 0;
 
 	if (ms_hyperv.paravisor_present || hv_root_partition) {
@@ -394,12 +390,12 @@ void hv_synic_disable_regs(unsigned int cpu)
 		siefp.base_siefp_gpa = 0;
 	}
 
-	hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);
+	hv_set_msr(HV_MSR_SIEFP, siefp.as_uint64);
 
 	/* Disable the global synic bit */
-	sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL);
+	sctrl.as_uint64 = hv_get_msr(HV_MSR_SCONTROL);
 	sctrl.enable = 0;
-	hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
+	hv_set_msr(HV_MSR_SCONTROL, sctrl.as_uint64);
 
 	if (vmbus_irq != -1)
 		disable_percpu_irq(vmbus_irq);
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 0285a74363..dde3f9b687 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -20,8 +20,11 @@
 #include <linux/sched/task_stack.h>
 #include <linux/panic_notifier.h>
 #include <linux/ptrace.h>
+#include <linux/random.h>
+#include <linux/efi.h>
 #include <linux/kdebug.h>
 #include <linux/kmsg_dump.h>
+#include <linux/sizes.h>
 #include <linux/slab.h>
 #include <linux/dma-map-ops.h>
 #include <linux/set_memory.h>
@@ -227,19 +230,19 @@ static void hv_kmsg_dump(struct kmsg_dumper *dumper,
 	 * contain the size of the panic data in that page. Rest of the
 	 * registers are no-op when the NOTIFY_MSG flag is set.
 	 */
-	hv_set_register(HV_REGISTER_CRASH_P0, 0);
-	hv_set_register(HV_REGISTER_CRASH_P1, 0);
-	hv_set_register(HV_REGISTER_CRASH_P2, 0);
-	hv_set_register(HV_REGISTER_CRASH_P3, virt_to_phys(hv_panic_page));
-	hv_set_register(HV_REGISTER_CRASH_P4, bytes_written);
+	hv_set_msr(HV_MSR_CRASH_P0, 0);
+	hv_set_msr(HV_MSR_CRASH_P1, 0);
+	hv_set_msr(HV_MSR_CRASH_P2, 0);
+	hv_set_msr(HV_MSR_CRASH_P3, virt_to_phys(hv_panic_page));
+	hv_set_msr(HV_MSR_CRASH_P4, bytes_written);
 
 	/*
 	 * Let Hyper-V know there is crash data available along with
 	 * the panic message.
 	 */
-	hv_set_register(HV_REGISTER_CRASH_CTL,
-			(HV_CRASH_CTL_CRASH_NOTIFY |
-			 HV_CRASH_CTL_CRASH_NOTIFY_MSG));
+	hv_set_msr(HV_MSR_CRASH_CTL,
+		   (HV_CRASH_CTL_CRASH_NOTIFY |
+		    HV_CRASH_CTL_CRASH_NOTIFY_MSG));
 }
 
 static struct kmsg_dumper hv_kmsg_dumper = {
@@ -278,6 +281,14 @@ static void hv_kmsg_dump_register(void)
 int __init hv_common_init(void)
 {
 	int i;
+	union hv_hypervisor_version_info version;
+
+	/* Get information about the Hyper-V host version */
+	if (!hv_get_hypervisor_version(&version))
+		pr_info("Hyper-V: Host Build %d.%d.%d.%d-%d-%d\n",
+			version.major_version, version.minor_version,
+			version.build_number, version.service_number,
+			version.service_pack, version.service_branch);
 
 	if (hv_is_isolation_supported())
 		sysctl_record_panic_msg = 0;
@@ -310,7 +321,7 @@ int __init hv_common_init(void)
 		 * Register for panic kmsg callback only if the right
 		 * capability is supported by the hypervisor.
 		 */
-		hyperv_crash_ctl = hv_get_register(HV_REGISTER_CRASH_CTL);
+		hyperv_crash_ctl = hv_get_msr(HV_MSR_CRASH_CTL);
 		if (hyperv_crash_ctl & HV_CRASH_CTL_CRASH_NOTIFY_MSG)
 			hv_kmsg_dump_register();
 
@@ -347,6 +358,72 @@ int __init hv_common_init(void)
 	return 0;
 }
 
+void __init ms_hyperv_late_init(void)
+{
+	struct acpi_table_header *header;
+	acpi_status status;
+	u8 *randomdata;
+	u32 length, i;
+
+	/*
+	 * Seed the Linux random number generator with entropy provided by
+	 * the Hyper-V host in ACPI table OEM0.
+	 */
+	if (!IS_ENABLED(CONFIG_ACPI))
+		return;
+
+	status = acpi_get_table("OEM0", 0, &header);
+	if (ACPI_FAILURE(status) || !header)
+		return;
+
+	/*
+	 * Since the "OEM0" table name is for OEM specific usage, verify
+	 * that what we're seeing purports to be from Microsoft.
+	 */
+	if (strncmp(header->oem_table_id, "MICROSFT", 8))
+		goto error;
+
+	/*
+	 * Ensure the length is reasonable. Requiring at least 8 bytes and
+	 * no more than 4K bytes is somewhat arbitrary and just protects
+	 * against a malformed table. Hyper-V currently provides 64 bytes,
+	 * but allow for a change in a later version.
+	 */
+	if (header->length < sizeof(*header) + 8 ||
+	    header->length > sizeof(*header) + SZ_4K)
+		goto error;
+
+	length = header->length - sizeof(*header);
+	randomdata = (u8 *)(header + 1);
+
+	pr_debug("Hyper-V: Seeding rng with %d random bytes from ACPI table OEM0\n",
+			length);
+
+	add_bootloader_randomness(randomdata, length);
+
+	/*
+	 * To prevent the seed data from being visible in /sys/firmware/acpi,
+	 * zero out the random data in the ACPI table and fixup the checksum.
+	 * The zero'ing is done out of an abundance of caution in avoiding
+	 * potential security risks to the rng. Similarly, reset the table
+	 * length to just the header size so that a subsequent kexec doesn't
+	 * try to use the zero'ed out random data.
+	 */
+	for (i = 0; i < length; i++) {
+		header->checksum += randomdata[i];
+		randomdata[i] = 0;
+	}
+
+	for (i = 0; i < sizeof(header->length); i++)
+		header->checksum += ((u8 *)&header->length)[i];
+	header->length = sizeof(*header);
+	for (i = 0; i < sizeof(header->length); i++)
+		header->checksum -= ((u8 *)&header->length)[i];
+
+error:
+	acpi_put_table(header);
+}
+
 /*
  * Hyper-V specific initialization and die code for
  * individual CPUs that is common across all architectures.
@@ -409,7 +486,7 @@ int hv_common_cpu_init(unsigned int cpu)
 		*inputarg = mem;
 	}
 
-	msr_vp_index = hv_get_register(HV_REGISTER_VP_INDEX);
+	msr_vp_index = hv_get_msr(HV_MSR_VP_INDEX);
 
 	hv_vp_index[cpu] = msr_vp_index;
 
@@ -506,7 +583,7 @@ EXPORT_SYMBOL_GPL(hv_is_hibernation_supported);
  */
 static u64 __hv_read_ref_counter(void)
 {
-	return hv_get_register(HV_REGISTER_TIME_REF_COUNT);
+	return hv_get_msr(HV_MSR_TIME_REF_COUNT);
 }
 
 u64 (*hv_read_reference_counter)(void) = __hv_read_ref_counter;
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 7f7965f3d1..12a707ab73 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -131,7 +131,7 @@ static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr,
 
 	if (!hv_dev->channel)
 		return -ENODEV;
-	return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid);
+	return sysfs_emit(buf, "%d\n", hv_dev->channel->offermsg.child_relid);
 }
 static DEVICE_ATTR_RO(id);
 
@@ -142,7 +142,7 @@ static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr,
 
 	if (!hv_dev->channel)
 		return -ENODEV;
-	return sprintf(buf, "%d\n", hv_dev->channel->state);
+	return sysfs_emit(buf, "%d\n", hv_dev->channel->state);
 }
 static DEVICE_ATTR_RO(state);
 
@@ -153,7 +153,7 @@ static ssize_t monitor_id_show(struct device *dev,
 
 	if (!hv_dev->channel)
 		return -ENODEV;
-	return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid);
+	return sysfs_emit(buf, "%d\n", hv_dev->channel->offermsg.monitorid);
 }
 static DEVICE_ATTR_RO(monitor_id);
 
@@ -164,8 +164,8 @@ static ssize_t class_id_show(struct device *dev,
 
 	if (!hv_dev->channel)
 		return -ENODEV;
-	return sprintf(buf, "{%pUl}\n",
-		       &hv_dev->channel->offermsg.offer.if_type);
+	return sysfs_emit(buf, "{%pUl}\n",
+			  &hv_dev->channel->offermsg.offer.if_type);
 }
 static DEVICE_ATTR_RO(class_id);
 
@@ -176,8 +176,8 @@ static ssize_t device_id_show(struct device *dev,
 
 	if (!hv_dev->channel)
 		return -ENODEV;
-	return sprintf(buf, "{%pUl}\n",
-		       &hv_dev->channel->offermsg.offer.if_instance);
+	return sysfs_emit(buf, "{%pUl}\n",
+			  &hv_dev->channel->offermsg.offer.if_instance);
 }
 static DEVICE_ATTR_RO(device_id);
 
@@ -186,7 +186,7 @@ static ssize_t modalias_show(struct device *dev,
 {
 	struct hv_device *hv_dev = device_to_hv_device(dev);
 
-	return sprintf(buf, "vmbus:%*phN\n", UUID_SIZE, &hv_dev->dev_type);
+	return sysfs_emit(buf, "vmbus:%*phN\n", UUID_SIZE, &hv_dev->dev_type);
 }
 static DEVICE_ATTR_RO(modalias);
 
@@ -199,7 +199,7 @@ static ssize_t numa_node_show(struct device *dev,
 	if (!hv_dev->channel)
 		return -ENODEV;
 
-	return sprintf(buf, "%d\n", cpu_to_node(hv_dev->channel->target_cpu));
+	return sysfs_emit(buf, "%d\n", cpu_to_node(hv_dev->channel->target_cpu));
 }
 static DEVICE_ATTR_RO(numa_node);
 #endif
@@ -212,9 +212,8 @@ static ssize_t server_monitor_pending_show(struct device *dev,
 
 	if (!hv_dev->channel)
 		return -ENODEV;
-	return sprintf(buf, "%d\n",
-		       channel_pending(hv_dev->channel,
-				       vmbus_connection.monitor_pages[0]));
+	return sysfs_emit(buf, "%d\n", channel_pending(hv_dev->channel,
+			  vmbus_connection.monitor_pages[0]));
 }
 static DEVICE_ATTR_RO(server_monitor_pending);
 
@@ -226,9 +225,8 @@ static ssize_t client_monitor_pending_show(struct device *dev,
 
 	if (!hv_dev->channel)
 		return -ENODEV;
-	return sprintf(buf, "%d\n",
-		       channel_pending(hv_dev->channel,
-				       vmbus_connection.monitor_pages[1]));
+	return sysfs_emit(buf, "%d\n", channel_pending(hv_dev->channel,
+			  vmbus_connection.monitor_pages[1]));
 }
 static DEVICE_ATTR_RO(client_monitor_pending);
 
@@ -240,9 +238,8 @@ static ssize_t server_monitor_latency_show(struct device *dev,
 
 	if (!hv_dev->channel)
 		return -ENODEV;
-	return sprintf(buf, "%d\n",
-		       channel_latency(hv_dev->channel,
-				       vmbus_connection.monitor_pages[0]));
+	return sysfs_emit(buf, "%d\n", channel_latency(hv_dev->channel,
+			  vmbus_connection.monitor_pages[0]));
 }
 static DEVICE_ATTR_RO(server_monitor_latency);
 
@@ -254,9 +251,8 @@ static ssize_t client_monitor_latency_show(struct device *dev,
 
 	if (!hv_dev->channel)
 		return -ENODEV;
-	return sprintf(buf, "%d\n",
-		       channel_latency(hv_dev->channel,
-				       vmbus_connection.monitor_pages[1]));
+	return sysfs_emit(buf, "%d\n", channel_latency(hv_dev->channel,
+			  vmbus_connection.monitor_pages[1]));
 }
 static DEVICE_ATTR_RO(client_monitor_latency);
 
@@ -268,9 +264,8 @@ static ssize_t server_monitor_conn_id_show(struct device *dev,
 
 	if (!hv_dev->channel)
 		return -ENODEV;
-	return sprintf(buf, "%d\n",
-		       channel_conn_id(hv_dev->channel,
-				       vmbus_connection.monitor_pages[0]));
+	return sysfs_emit(buf, "%d\n", channel_conn_id(hv_dev->channel,
+			  vmbus_connection.monitor_pages[0]));
 }
 static DEVICE_ATTR_RO(server_monitor_conn_id);
 
@@ -282,9 +277,8 @@ static ssize_t client_monitor_conn_id_show(struct device *dev,
 
 	if (!hv_dev->channel)
 		return -ENODEV;
-	return sprintf(buf, "%d\n",
-		       channel_conn_id(hv_dev->channel,
-				       vmbus_connection.monitor_pages[1]));
+	return sysfs_emit(buf, "%d\n", channel_conn_id(hv_dev->channel,
+			  vmbus_connection.monitor_pages[1]));
 }
 static DEVICE_ATTR_RO(client_monitor_conn_id);
 
@@ -303,7 +297,7 @@ static ssize_t out_intr_mask_show(struct device *dev,
 	if (ret < 0)
 		return ret;
 
-	return sprintf(buf, "%d\n", outbound.current_interrupt_mask);
+	return sysfs_emit(buf, "%d\n", outbound.current_interrupt_mask);
 }
 static DEVICE_ATTR_RO(out_intr_mask);
 
@@ -321,7 +315,7 @@ static ssize_t out_read_index_show(struct device *dev,
 					  &outbound);
 	if (ret < 0)
 		return ret;
-	return sprintf(buf, "%d\n", outbound.current_read_index);
+	return sysfs_emit(buf, "%d\n", outbound.current_read_index);
 }
 static DEVICE_ATTR_RO(out_read_index);
 
@@ -340,7 +334,7 @@ static ssize_t out_write_index_show(struct device *dev,
 					  &outbound);
 	if (ret < 0)
 		return ret;
-	return sprintf(buf, "%d\n", outbound.current_write_index);
+	return sysfs_emit(buf, "%d\n", outbound.current_write_index);
 }
 static DEVICE_ATTR_RO(out_write_index);
 
@@ -359,7 +353,7 @@ static ssize_t out_read_bytes_avail_show(struct device *dev,
 					  &outbound);
 	if (ret < 0)
 		return ret;
-	return sprintf(buf, "%d\n", outbound.bytes_avail_toread);
+	return sysfs_emit(buf, "%d\n", outbound.bytes_avail_toread);
 }
 static DEVICE_ATTR_RO(out_read_bytes_avail);
 
@@ -378,7 +372,7 @@ static ssize_t out_write_bytes_avail_show(struct device *dev,
 					  &outbound);
 	if (ret < 0)
 		return ret;
-	return sprintf(buf, "%d\n", outbound.bytes_avail_towrite);
+	return sysfs_emit(buf, "%d\n", outbound.bytes_avail_towrite);
 }
 static DEVICE_ATTR_RO(out_write_bytes_avail);
 
@@ -396,7 +390,7 @@ static ssize_t in_intr_mask_show(struct device *dev,
 	if (ret < 0)
 		return ret;
 
-	return sprintf(buf, "%d\n", inbound.current_interrupt_mask);
+	return sysfs_emit(buf, "%d\n", inbound.current_interrupt_mask);
 }
 static DEVICE_ATTR_RO(in_intr_mask);
 
@@ -414,7 +408,7 @@ static ssize_t in_read_index_show(struct device *dev,
 	if (ret < 0)
 		return ret;
 
-	return sprintf(buf, "%d\n", inbound.current_read_index);
+	return sysfs_emit(buf, "%d\n", inbound.current_read_index);
 }
 static DEVICE_ATTR_RO(in_read_index);
 
@@ -432,7 +426,7 @@ static ssize_t in_write_index_show(struct device *dev,
 	if (ret < 0)
 		return ret;
 
-	return sprintf(buf, "%d\n", inbound.current_write_index);
+	return sysfs_emit(buf, "%d\n", inbound.current_write_index);
 }
 static DEVICE_ATTR_RO(in_write_index);
 
@@ -451,7 +445,7 @@ static ssize_t in_read_bytes_avail_show(struct device *dev,
 	if (ret < 0)
 		return ret;
 
-	return sprintf(buf, "%d\n", inbound.bytes_avail_toread);
+	return sysfs_emit(buf, "%d\n", inbound.bytes_avail_toread);
 }
 static DEVICE_ATTR_RO(in_read_bytes_avail);
 
@@ -470,7 +464,7 @@ static ssize_t in_write_bytes_avail_show(struct device *dev,
 	if (ret < 0)
 		return ret;
 
-	return sprintf(buf, "%d\n", inbound.bytes_avail_towrite);
+	return sysfs_emit(buf, "%d\n", inbound.bytes_avail_towrite);
 }
 static DEVICE_ATTR_RO(in_write_bytes_avail);
 
@@ -480,7 +474,7 @@ static ssize_t channel_vp_mapping_show(struct device *dev,
 {
 	struct hv_device *hv_dev = device_to_hv_device(dev);
 	struct vmbus_channel *channel = hv_dev->channel, *cur_sc;
-	int buf_size = PAGE_SIZE, n_written, tot_written;
+	int n_written;
 	struct list_head *cur;
 
 	if (!channel)
@@ -488,25 +482,21 @@ static ssize_t channel_vp_mapping_show(struct device *dev,
 
 	mutex_lock(&vmbus_connection.channel_mutex);
 
-	tot_written = snprintf(buf, buf_size, "%u:%u\n",
-		channel->offermsg.child_relid, channel->target_cpu);
+	n_written = sysfs_emit(buf, "%u:%u\n",
+			       channel->offermsg.child_relid,
+			       channel->target_cpu);
 
 	list_for_each(cur, &channel->sc_list) {
-		if (tot_written >= buf_size - 1)
-			break;
 
 		cur_sc = list_entry(cur, struct vmbus_channel, sc_list);
-		n_written = scnprintf(buf + tot_written,
-				     buf_size - tot_written,
-				     "%u:%u\n",
-				     cur_sc->offermsg.child_relid,
-				     cur_sc->target_cpu);
-		tot_written += n_written;
+		n_written += sysfs_emit_at(buf, n_written, "%u:%u\n",
+					  cur_sc->offermsg.child_relid,
+					  cur_sc->target_cpu);
 	}
 
 	mutex_unlock(&vmbus_connection.channel_mutex);
 
-	return tot_written;
+	return n_written;
 }
 static DEVICE_ATTR_RO(channel_vp_mapping);
 
@@ -516,7 +506,7 @@ static ssize_t vendor_show(struct device *dev,
 {
 	struct hv_device *hv_dev = device_to_hv_device(dev);
 
-	return sprintf(buf, "0x%x\n", hv_dev->vendor_id);
+	return sysfs_emit(buf, "0x%x\n", hv_dev->vendor_id);
 }
 static DEVICE_ATTR_RO(vendor);
 
@@ -526,7 +516,7 @@ static ssize_t device_show(struct device *dev,
 {
 	struct hv_device *hv_dev = device_to_hv_device(dev);
 
-	return sprintf(buf, "0x%x\n", hv_dev->device_id);
+	return sysfs_emit(buf, "0x%x\n", hv_dev->device_id);
 }
 static DEVICE_ATTR_RO(device);
 
@@ -551,7 +541,7 @@ static ssize_t driver_override_show(struct device *dev,
 	ssize_t len;
 
 	device_lock(dev);
-	len = snprintf(buf, PAGE_SIZE, "%s\n", hv_dev->driver_override);
+	len = sysfs_emit(buf, "%s\n", hv_dev->driver_override);
 	device_unlock(dev);
 
 	return len;
@@ -2359,10 +2349,9 @@ static int vmbus_platform_driver_probe(struct platform_device *pdev)
 		return vmbus_acpi_add(pdev);
 }
 
-static int vmbus_platform_driver_remove(struct platform_device *pdev)
+static void vmbus_platform_driver_remove(struct platform_device *pdev)
 {
 	vmbus_mmio_remove();
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -2542,7 +2531,7 @@ static const struct dev_pm_ops vmbus_bus_pm = {
 
 static struct platform_driver vmbus_platform_driver = {
 	.probe = vmbus_platform_driver_probe,
-	.remove = vmbus_platform_driver_remove,
+	.remove_new = vmbus_platform_driver_remove,
 	.driver = {
 		.name = "vmbus",
 		.acpi_match_table = ACPI_PTR(vmbus_acpi_device_ids),