linux-kernel - [PATCH 2/5] drivers: hv: Allow vmbus message synic interrupt injected from Hyper-V

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20250918150023.474021-3-tiala@microsoft.com>
Date: Thu, 18 Sep 2025 11:00:20 -0400
From: Tianyu Lan <ltykernel@...il.com>
To: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	arnd@...db.de,
	Neeraj.Upadhyay@....com,
	tiala@...rosoft.com,
	kvijayab@....com,
	romank@...ux.microsoft.com
Cc: linux-arch@...r.kernel.org,
	linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Michael Kelley <mhklinux@...look.com>
Subject: [PATCH 2/5] drivers: hv: Allow vmbus message synic interrupt injected from Hyper-V

When Secure AVIC is enabled, VMBus driver should
call x2apic Secure AVIC interface to allow Hyper-V
to inject VMBus message interrupt.

Reviewed-by: Michael Kelley <mhklinux@...look.com>
Reviewed-by: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
Signed-off-by: Tianyu Lan <tiala@...rosoft.com>
---
 arch/x86/hyperv/hv_apic.c      | 5 +++++
 drivers/hv/hv.c                | 2 ++
 drivers/hv/hv_common.c         | 5 +++++
 include/asm-generic/mshyperv.h | 1 +
 4 files changed, 13 insertions(+)

diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c
index e669053b637d..a8de503def37 100644
--- a/arch/x86/hyperv/hv_apic.c
+++ b/arch/x86/hyperv/hv_apic.c
@@ -53,6 +53,11 @@ static void hv_apic_icr_write(u32 low, u32 id)
 	wrmsrq(HV_X64_MSR_ICR, reg_val);
 }
 
+void hv_enable_coco_interrupt(unsigned int cpu, unsigned int vector, bool set)
+{
+	apic_update_vector(cpu, vector, set);
+}
+
 static u32 hv_apic_read(u32 reg)
 {
 	u32 reg_val, hi;
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index b14c5f9e0ef2..ec5d10839e0f 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -307,6 +307,7 @@ void hv_synic_enable_regs(unsigned int cpu)
 	}
 
 	hv_set_msr(HV_MSR_SIEFP, siefp.as_uint64);
+	hv_enable_coco_interrupt(cpu, vmbus_interrupt, true);
 
 	/* Setup the shared SINT. */
 	if (vmbus_irq != -1)
@@ -350,6 +351,7 @@ void hv_synic_disable_regs(unsigned int cpu)
 	/* Need to correctly cleanup in the case of SMP!!! */
 	/* Disable the interrupt */
 	hv_set_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
+	hv_enable_coco_interrupt(cpu, vmbus_interrupt, false);
 
 	simp.as_uint64 = hv_get_msr(HV_MSR_SIMP);
 	/*
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 49898d10faff..0f024ab3d360 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -716,6 +716,11 @@ u64 __weak hv_tdx_hypercall(u64 control, u64 param1, u64 param2)
 }
 EXPORT_SYMBOL_GPL(hv_tdx_hypercall);
 
+void __weak hv_enable_coco_interrupt(unsigned int cpu, unsigned int vector, bool set)
+{
+}
+EXPORT_SYMBOL_GPL(hv_enable_coco_interrupt);
+
 void hv_identify_partition_type(void)
 {
 	/* Assume guest role */
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index a729b77983fa..7907c9878369 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -333,6 +333,7 @@ bool hv_is_isolation_supported(void);
 bool hv_isolation_type_snp(void);
 u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size);
 u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);
+void hv_enable_coco_interrupt(unsigned int cpu, unsigned int vector, bool set);
 void hyperv_cleanup(void);
 bool hv_query_ext_cap(u64 cap_query);
 void hv_setup_dma_ops(struct device *dev, bool coherent);
-- 
2.25.1