Merge tag 'hyperv-next-signed-20260826' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

Pull hyperv updates from Wei Liu:

 - Decrypt netvsc buffer on contiguous direct-map addresses (Kameron
   Carr)

 - Drop WS2012/2012R2 & Win8/8.1 Hyper-V support (Michael Kelley)

 - Use more meaningful errnos for hypercall status code (Hardik Garg)

 - Fix lost interrupts on CPU hot-unplug for Hyper-V PCI/MSI (Naman
   Jain)

 - Reserve more MSHV vectors for Linux root partition (Wei Liu)

* tag 'hyperv-next-signed-20260826' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
  clocksource: hyper-v: Remove support for stimer interrupts in message mode
  scsi: storvsc: Remove support for storvsc protocol of old Hyper-V hosts
  hv_netvsc: Remove GPADL teardown special case for old Hyper-V hosts
  hv_sock: Remove check for old Hyper-V hosts
  Drivers: hv: Remove support for WS2012/2012R2 & Win8/8.1 version of Hyper-V
  hv_netvsc: Allocate send/receive buffers using vmbus_alloc_buffer()
  Drivers: hv: vmbus: Add vmbus_alloc_buffer()/vmbus_free_buffer() for CoCo VMs
  Drivers: hv: vmbus: add vmbus_establish_gpadl_caller_decrypted()
  Drivers: hv: vmbus: Skip VMBus module cleanup for non-nested root partition
  x86/hyperv: reserve more vectors
  PCI: hv: Set irq_retrigger callback for the Hyper-V PCI MSI irqchip
  Drivers: hv: Use meaningful errnos for hypercall status codes

2 files changed, 28 insertions, 14 deletions

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 55a8b6de2865..0b4a1c0b0b16 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -171,8 +171,7 @@ static int hv_cpu_init(unsigned int cpu)
 	}
 
 	/* Allow Hyper-V stimer vector to be injected from Hypervisor. */
-	if (ms_hyperv.misc_features & HV_STIMER_DIRECT_MODE_AVAILABLE)
-		apic_update_vector(cpu, HYPERV_STIMER0_VECTOR, true);
+	apic_update_vector(cpu, HYPERV_STIMER0_VECTOR, true);
 
 	return hyperv_init_ghcb();
 }
@@ -281,8 +280,7 @@ static int hv_cpu_die(unsigned int cpu)
 		*ghcb_va = NULL;
 	}
 
-	if (ms_hyperv.misc_features & HV_STIMER_DIRECT_MODE_AVAILABLE)
-		apic_update_vector(cpu, HYPERV_STIMER0_VECTOR, false);
+	apic_update_vector(cpu, HYPERV_STIMER0_VECTOR, false);
 
 	hv_common_cpu_die(cpu);
 
@@ -425,15 +423,18 @@ static void (* __initdata old_setup_percpu_clockev)(void);
 
 static void __init hv_stimer_setup_percpu_clockev(void)
 {
+	int ret;
+
 	/*
-	 * Ignore any errors in setting up stimer clockevents
+	 * Continue afters errors in setting up stimer clockevents
 	 * as we can run with the LAPIC timer as a fallback.
 	 */
-	(void)hv_stimer_alloc(false);
+	ret = hv_stimer_alloc(false);
+	if (ret)
+		pr_warn("stimer setup failed with error %d\n", ret);
 
 	/*
-	 * Still register the LAPIC timer, because the direct-mode STIMER is
-	 * not supported by old versions of Hyper-V. This also allows users
+	 * Still register the LAPIC timer to allows users
 	 * to switch to LAPIC timer via /sys, if they want to.
 	 */
 	if (old_setup_percpu_clockev)
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 185d4f677ec0..b4af7c0a70ac 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -502,17 +502,32 @@ static void hv_reserve_irq_vectors(void)
 	#define HYPERV_DBG_ASSERT_VECTOR	0x2C
 	#define HYPERV_DBG_SERVICE_VECTOR	0x2D
 
+	/*
+	 * The hypervisor delivers these three to the NT HAL and refuses to
+	 * map a device interrupt to any of them.
+	 *
+	 * The hypervisor will provide a hint in the future when these
+	 * vectors become available to use.
+	 */
+	#define HAL_NT_APC_VECTOR		0x1F
+	#define HAL_NT_DPC_VECTOR		0x2F
+	#define HAL_NT_CLOCK_IPI_VECTOR		0xD2
+
 	if (cpu_feature_enabled(X86_FEATURE_FRED))
 		return;
 
 	if (test_and_set_bit(HYPERV_DBG_ASSERT_VECTOR, system_vectors) ||
 	    test_and_set_bit(HYPERV_DBG_SERVICE_VECTOR, system_vectors) ||
-	    test_and_set_bit(HYPERV_DBG_FASTFAIL_VECTOR, system_vectors))
+	    test_and_set_bit(HYPERV_DBG_FASTFAIL_VECTOR, system_vectors) ||
+	    test_and_set_bit(HAL_NT_APC_VECTOR, system_vectors) ||
+	    test_and_set_bit(HAL_NT_DPC_VECTOR, system_vectors) ||
+	    test_and_set_bit(HAL_NT_CLOCK_IPI_VECTOR, system_vectors))
 		BUG();
 
-	pr_info("Hyper-V: reserve vectors: 0x%x 0x%x 0x%x\n",
+	pr_info("Hyper-V: reserve vectors: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
 		HYPERV_DBG_ASSERT_VECTOR, HYPERV_DBG_SERVICE_VECTOR,
-		HYPERV_DBG_FASTFAIL_VECTOR);
+		HYPERV_DBG_FASTFAIL_VECTOR, HAL_NT_APC_VECTOR,
+		HAL_NT_DPC_VECTOR, HAL_NT_CLOCK_IPI_VECTOR);
 }
 
 static void __init ms_hyperv_init_platform(void)
@@ -716,9 +731,7 @@ static void __init ms_hyperv_init_platform(void)
 	}
 
 	/* Install system interrupt handler for stimer0 */
-	if (ms_hyperv.misc_features & HV_STIMER_DIRECT_MODE_AVAILABLE) {
-		sysvec_install(HYPERV_STIMER0_VECTOR, sysvec_hyperv_stimer0);
-	}
+	sysvec_install(HYPERV_STIMER0_VECTOR, sysvec_hyperv_stimer0);
 
 # ifdef CONFIG_SMP
 	smp_ops.smp_prepare_boot_cpu = hv_smp_prepare_boot_cpu;