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Message-Id: <20250804180525.32658-3-ltykernel@gmail.com>
Date: Mon, 4 Aug 2025 14:05:23 -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,
kvijayab@....com
Cc: Tianyu Lan <tiala@...rosoft.com>,
linux-arch@...r.kernel.org,
linux-hyperv@...r.kernel.org,
linux-kernel@...r.kernel.org,
Michael Kelley <mhklinux@...look.com>
Subject: [RFC PATCH V5 2/4] Drivers: hv: Allow vmbus message synic interrupt injected from Hyper-V
From: Tianyu Lan <tiala@...rosoft.com>
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>
Signed-off-by: Tianyu Lan <tiala@...rosoft.com>
---
Change since RFC V4:
- Change the order to call hv_enable_coco_interrupt()
in the hv_synic_enable/disable_regs().
- Update commit title "Drivers/hv:" to "Drivers: hv:"
Change since RFC V3:
- Disable VMBus Message interrupt via hv_enable_
coco_interrupt() in the hv_synic_disable_regs().
---
arch/x86/hyperv/hv_apic.c | 5 +++++
drivers/hv/hv.c | 7 ++++++-
drivers/hv/hv_common.c | 5 +++++
include/asm-generic/mshyperv.h | 1 +
4 files changed, 17 insertions(+), 1 deletion(-)
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 308c8f279df8..2ff433cb5cc2 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -314,8 +314,11 @@ void hv_synic_enable_regs(unsigned int cpu)
shared_sint.vector = vmbus_interrupt;
shared_sint.masked = false;
shared_sint.auto_eoi = hv_recommend_using_aeoi();
+
hv_set_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
+ hv_enable_coco_interrupt(cpu, vmbus_interrupt, true);
+
/* Enable the global synic bit */
sctrl.as_uint64 = hv_get_msr(HV_MSR_SCONTROL);
sctrl.enable = 1;
@@ -342,7 +345,6 @@ void hv_synic_disable_regs(unsigned int cpu)
union hv_synic_scontrol sctrl;
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!!! */
@@ -350,6 +352,9 @@ void hv_synic_disable_regs(unsigned int cpu)
hv_set_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
simp.as_uint64 = hv_get_msr(HV_MSR_SIMP);
+
+ hv_enable_coco_interrupt(cpu, vmbus_interrupt, false);
+
/*
* In Isolation VM, sim and sief pages are allocated by
* paravisor. These pages also will be used by kdump
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
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