From a8ab69cf6f43205a1d23557183a895aaee45b4c7 Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc@google.com>
Date: Fri, 7 Jun 2024 10:26:06 -0700
Subject: [PATCH] KVM: VMX: Split out the non-virtualization part of
vmx_interrupt_blocked()
commit 322a569c4b4188a0da2812f9e952780ce09b74ba upstream.
Move the non-VMX chunk of the "interrupt blocked" checks to a separate
helper so that KVM can reuse the code to detect if interrupts are blocked
for L2, e.g. to determine if a virtual interrupt _for L2_ is a valid wake
event. If L1 disables HLT-exiting for L2, nested APICv is enabled, and L2
HLTs, then L2 virtual interrupts are valid wake events, but if and only if
interrupts are unblocked for L2.
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240607172609.3205077-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/kvm/vmx/vmx.c | 11 ++++++++---
arch/x86/kvm/vmx/vmx.h | 1 +
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index b3c83c06f826..6f240638e145 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5052,14 +5052,19 @@ int vmx_nmi_allowed(struct kvm_vcpu *vcpu, bool for_injection)
return !vmx_nmi_blocked(vcpu);
}
+bool __vmx_interrupt_blocked(struct kvm_vcpu *vcpu)
+{
+ return !(vmx_get_rflags(vcpu) & X86_EFLAGS_IF) ||
+ (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
+ (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
+}
+
bool vmx_interrupt_blocked(struct kvm_vcpu *vcpu)
{
if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu))
return false;
- return !(vmx_get_rflags(vcpu) & X86_EFLAGS_IF) ||
- (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
- (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
+ return __vmx_interrupt_blocked(vcpu);
}
int vmx_interrupt_allowed(struct kvm_vcpu *vcpu, bool for_injection)
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index 7b64e271a931..2e23a01fe320 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -406,6 +406,7 @@ u64 construct_eptp(struct kvm_vcpu *vcpu, hpa_t root_hpa, int root_level);
bool vmx_guest_inject_ac(struct kvm_vcpu *vcpu);
void vmx_update_exception_bitmap(struct kvm_vcpu *vcpu);
bool vmx_nmi_blocked(struct kvm_vcpu *vcpu);
+bool __vmx_interrupt_blocked(struct kvm_vcpu *vcpu);
bool vmx_interrupt_blocked(struct kvm_vcpu *vcpu);
bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu);
void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked);