linux-kernel - [PATCH 4/7] KVM: Introduce KVM_HYPERV_SET_TLB_FLUSH

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Message-ID: <20241004140810.34231-5-nikwip@amazon.de>
Date: Fri, 4 Oct 2024 14:08:07 +0000
From: Nikolas Wipper <nikwip@...zon.de>
To: Vitaly Kuznetsov <vkuznets@...hat.com>
CC: Nicolas Saenz Julienne <nsaenz@...zon.com>, Alexander Graf
	<graf@...zon.de>, James Gowans <jgowans@...zon.com>,
	<nh-open-source@...zon.com>, Sean Christopherson <seanjc@...gle.com>, "Paolo
 Bonzini" <pbonzini@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, "Ingo
 Molnar" <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>, Nikolas Wipper <nik.wipper@....de>,
	<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>, <x86@...nel.org>,
	<linux-doc@...r.kernel.org>, <linux-kselftest@...r.kernel.org>, "Nikolas
 Wipper" <nikwip@...zon.de>
Subject: [PATCH 4/7] KVM: Introduce KVM_HYPERV_SET_TLB_FLUSH_INHIBIT

Introduce a new ioctl to control whether remote flushing via Hyper-V
hyper-calls should be allowed on a vCPU. When the tlb_flush_inhibit bit is
set, vCPUs attempting to flush the TLB of the inhibitied vCPU will be
suspended until the bit is clearded.

Signed-off-by: Nikolas Wipper <nikwip@...zon.de>
---
 include/uapi/linux/kvm.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 637efc055145..3bc43fdcab88 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -933,6 +933,7 @@ struct kvm_enable_cap {
 #define KVM_CAP_PRE_FAULT_MEMORY 236
 #define KVM_CAP_X86_APIC_BUS_CYCLES_NS 237
 #define KVM_CAP_X86_GUEST_MODE 238
+#define KVM_CAP_HYPERV_TLB_FLUSH_INHIBIT 239
 
 struct kvm_irq_routing_irqchip {
 	__u32 irqchip;
@@ -1573,4 +1574,18 @@ struct kvm_pre_fault_memory {
 	__u64 padding[5];
 };
 
+/* Available with KVM_CAP_HYPERV_TLBFLUSH */
+#define KVM_HYPERV_SET_TLB_FLUSH_INHIBIT \
+	_IOW(KVMIO,  0xd6, struct kvm_hyperv_tlb_flush_inhibit)
+
+/* for KVM_HYPERV_SET_TLB_FLUSH_INHIBIT */
+struct kvm_hyperv_tlb_flush_inhibit {
+	/* in */
+	__u16 flags;
+#define KVM_HYPERV_UNINHIBIT_TLB_FLUSH 0
+#define KVM_HYPERV_INHIBIT_TLB_FLUSH 1
+	__u8  inhibit;
+	__u8  reserved[5];
+};
+
 #endif /* __LINUX_KVM_H */
-- 
2.40.1




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