Merge tag 'hyperv-next-signed-20251006' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

Pull hyperv updates from Wei Liu:

 - Unify guest entry code for KVM and MSHV (Sean Christopherson)

 - Switch Hyper-V MSI domain to use msi_create_parent_irq_domain()
   (Nam Cao)

 - Add CONFIG_HYPERV_VMBUS and limit the semantics of CONFIG_HYPERV
   (Mukesh Rathor)

 - Add kexec/kdump support on Azure CVMs (Vitaly Kuznetsov)

 - Deprecate hyperv_fb in favor of Hyper-V DRM driver (Prasanna
   Kumar T S M)

 - Miscellaneous enhancements, fixes and cleanups (Abhishek Tiwari,
   Alok Tiwari, Nuno Das Neves, Wei Liu, Roman Kisel, Michael Kelley)

* tag 'hyperv-next-signed-20251006' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
  hyperv: Remove the spurious null directive line
  MAINTAINERS: Mark hyperv_fb driver Obsolete
  fbdev/hyperv_fb: deprecate this in favor of Hyper-V DRM driver
  Drivers: hv: Make CONFIG_HYPERV bool
  Drivers: hv: Add CONFIG_HYPERV_VMBUS option
  Drivers: hv: vmbus: Fix typos in vmbus_drv.c
  Drivers: hv: vmbus: Fix sysfs output format for ring buffer index
  Drivers: hv: vmbus: Clean up sscanf format specifier in target_cpu_store()
  x86/hyperv: Switch to msi_create_parent_irq_domain()
  mshv: Use common "entry virt" APIs to do work in root before running guest
  entry: Rename "kvm" entry code assets to "virt" to genericize APIs
  entry/kvm: KVM: Move KVM details related to signal/-EINTR into KVM proper
  mshv: Handle NEED_RESCHED_LAZY before transferring to guest
  x86/hyperv: Add kexec/kdump support on Azure CVMs
  Drivers: hv: Simplify data structures for VMBus channel close message
  Drivers: hv: util: Cosmetic changes for hv_utils_transport.c
  mshv: Add support for a new parent partition configuration
  clocksource: hyper-v: Skip unnecessary checks for the root partition
  hyperv: Add missing field to hv_output_map_device_interrupt

1 files changed, 13 insertions, 9 deletions

diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 49898d10faff..e109a620c83f 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -257,7 +257,7 @@ static void hv_kmsg_dump_register(void)
 
 static inline bool hv_output_page_exists(void)
 {
-	return hv_root_partition() || IS_ENABLED(CONFIG_HYPERV_VTL_MODE);
+	return hv_parent_partition() || IS_ENABLED(CONFIG_HYPERV_VTL_MODE);
 }
 
 void __init hv_get_partition_id(void)
@@ -377,7 +377,7 @@ int __init hv_common_init(void)
 		BUG_ON(!hyperv_pcpu_output_arg);
 	}
 
-	if (hv_root_partition()) {
+	if (hv_parent_partition()) {
 		hv_synic_eventring_tail = alloc_percpu(u8 *);
 		BUG_ON(!hv_synic_eventring_tail);
 	}
@@ -531,7 +531,7 @@ int hv_common_cpu_init(unsigned int cpu)
 	if (msr_vp_index > hv_max_vp_index)
 		hv_max_vp_index = msr_vp_index;
 
-	if (hv_root_partition()) {
+	if (hv_parent_partition()) {
 		synic_eventring_tail = (u8 **)this_cpu_ptr(hv_synic_eventring_tail);
 		*synic_eventring_tail = kcalloc(HV_SYNIC_SINT_COUNT,
 						sizeof(u8), flags);
@@ -558,7 +558,7 @@ int hv_common_cpu_die(unsigned int cpu)
 	 * originally allocated memory is reused in hv_common_cpu_init().
 	 */
 
-	if (hv_root_partition()) {
+	if (hv_parent_partition()) {
 		synic_eventring_tail = this_cpu_ptr(hv_synic_eventring_tail);
 		kfree(*synic_eventring_tail);
 		*synic_eventring_tail = NULL;
@@ -729,13 +729,17 @@ void hv_identify_partition_type(void)
 	 * the root partition setting if also a Confidential VM.
 	 */
 	if ((ms_hyperv.priv_high & HV_CREATE_PARTITIONS) &&
-	    (ms_hyperv.priv_high & HV_CPU_MANAGEMENT) &&
 	    !(ms_hyperv.priv_high & HV_ISOLATION)) {
-		pr_info("Hyper-V: running as root partition\n");
-		if (IS_ENABLED(CONFIG_MSHV_ROOT))
-			hv_curr_partition_type = HV_PARTITION_TYPE_ROOT;
-		else
+
+		if (!IS_ENABLED(CONFIG_MSHV_ROOT)) {
 			pr_crit("Hyper-V: CONFIG_MSHV_ROOT not enabled!\n");
+		} else if (ms_hyperv.priv_high & HV_CPU_MANAGEMENT) {
+			pr_info("Hyper-V: running as root partition\n");
+			hv_curr_partition_type = HV_PARTITION_TYPE_ROOT;
+		} else {
+			pr_info("Hyper-V: running as L1VH partition\n");
+			hv_curr_partition_type = HV_PARTITION_TYPE_L1VH;
+		}
 	}
 }