* [PATCH 7.1.y 1/3] KVM: x86: Move update_cr8_intercept() to lapic.c
2026-07-09 13:21 [PATCH 7.1.y 0/3] KVM: x86: Backports for VM entry failure due to stale CR8 intercept Carlos López
@ 2026-07-09 13:21 ` Carlos López
2026-07-09 13:21 ` [PATCH 7.1.y 2/3] KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode Carlos López
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Carlos López @ 2026-07-09 13:21 UTC (permalink / raw)
To: stable
Cc: kvm, linux-kernel, gregkh, Sean Christopherson, Kai Huang,
Yosry Ahmed, Carlos López, Paolo Bonzini, Thomas Gleixner,
Ingo Molnar, Borislav Petkov, Dave Hansen,
maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT), H. Peter Anvin
From: Sean Christopherson <seanjc@google.com>
[ Upstream Commit c7722e5e1daeeabbd9f969554d52bb7158120b27 ]
Move update_cr8_intercept() to lapic.c so that it's globally visible
in anticipation of extracting most of the register-specific code out of
x86.c and into a new compilation unit. Opportunistically prefix the
helper kvm_lapic_ to make its role/scope more obvious.
No functional change intended.
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Yosry Ahmed <yosry@kernel.org>
Link: https://patch.msgid.link/20260529222223.870923-14-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Carlos López <clopez@suse.de>
---
arch/x86/kvm/lapic.c | 26 ++++++++++++++++++++++++++
arch/x86/kvm/lapic.h | 1 +
arch/x86/kvm/x86.c | 34 +++-------------------------------
3 files changed, 30 insertions(+), 31 deletions(-)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 4078e624ca66..f4574b5a16d8 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -2744,6 +2744,32 @@ u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
return (tpr & 0xf0) >> 4;
}
+void kvm_lapic_update_cr8_intercept(struct kvm_vcpu *vcpu)
+{
+ int max_irr, tpr;
+
+ if (!kvm_x86_ops.update_cr8_intercept)
+ return;
+
+ if (!lapic_in_kernel(vcpu))
+ return;
+
+ if (vcpu->arch.apic->apicv_active)
+ return;
+
+ if (!vcpu->arch.apic->vapic_addr)
+ max_irr = kvm_lapic_find_highest_irr(vcpu);
+ else
+ max_irr = -1;
+
+ if (max_irr != -1)
+ max_irr >>= 4;
+
+ tpr = kvm_lapic_get_cr8(vcpu);
+
+ kvm_x86_call(update_cr8_intercept)(vcpu, tpr, max_irr);
+}
+
static void __kvm_apic_set_base(struct kvm_vcpu *vcpu, u64 value)
{
u64 old_value = vcpu->arch.apic_base;
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 274885af4ebc..533581d06151 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -100,6 +100,7 @@ int kvm_apic_accept_events(struct kvm_vcpu *vcpu);
void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event);
u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu);
void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8);
+void kvm_lapic_update_cr8_intercept(struct kvm_vcpu *vcpu);
void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu);
void kvm_apic_set_version(struct kvm_vcpu *vcpu);
void kvm_apic_after_set_mcg_cap(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0550359ed798..2c5bc03292e3 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -128,7 +128,6 @@ static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE);
KVM_X2APIC_ENABLE_SUPPRESS_EOI_BROADCAST | \
KVM_X2APIC_DISABLE_SUPPRESS_EOI_BROADCAST)
-static void update_cr8_intercept(struct kvm_vcpu *vcpu);
static void process_nmi(struct kvm_vcpu *vcpu);
static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
static void store_regs(struct kvm_vcpu *vcpu);
@@ -5340,7 +5339,7 @@ static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
r = kvm_apic_set_state(vcpu, s);
if (r)
return r;
- update_cr8_intercept(vcpu);
+ kvm_lapic_update_cr8_intercept(vcpu);
return 0;
}
@@ -10595,33 +10594,6 @@ static void post_kvm_run_save(struct kvm_vcpu *vcpu)
kvm_run->flags |= KVM_RUN_X86_GUEST_MODE;
}
-static void update_cr8_intercept(struct kvm_vcpu *vcpu)
-{
- int max_irr, tpr;
-
- if (!kvm_x86_ops.update_cr8_intercept)
- return;
-
- if (!lapic_in_kernel(vcpu))
- return;
-
- if (vcpu->arch.apic->apicv_active)
- return;
-
- if (!vcpu->arch.apic->vapic_addr)
- max_irr = kvm_lapic_find_highest_irr(vcpu);
- else
- max_irr = -1;
-
- if (max_irr != -1)
- max_irr >>= 4;
-
- tpr = kvm_lapic_get_cr8(vcpu);
-
- kvm_x86_call(update_cr8_intercept)(vcpu, tpr, max_irr);
-}
-
-
int kvm_check_nested_events(struct kvm_vcpu *vcpu)
{
if (kvm_test_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
@@ -11362,7 +11334,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
kvm_x86_call(enable_irq_window)(vcpu);
if (kvm_lapic_enabled(vcpu)) {
- update_cr8_intercept(vcpu);
+ kvm_lapic_update_cr8_intercept(vcpu);
kvm_lapic_sync_to_vapic(vcpu);
}
}
@@ -12511,7 +12483,7 @@ static int __set_sregs_common(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs,
kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
- update_cr8_intercept(vcpu);
+ kvm_lapic_update_cr8_intercept(vcpu);
/* Older userspace won't unhalt the vcpu on reset. */
if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
--
2.51.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 7.1.y 2/3] KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode
2026-07-09 13:21 [PATCH 7.1.y 0/3] KVM: x86: Backports for VM entry failure due to stale CR8 intercept Carlos López
2026-07-09 13:21 ` [PATCH 7.1.y 1/3] KVM: x86: Move update_cr8_intercept() to lapic.c Carlos López
@ 2026-07-09 13:21 ` Carlos López
2026-07-09 13:21 ` [PATCH 7.1.y 3/3] KVM: x86: Unconditionally recompute CR8 intercept on PPR update Carlos López
2026-07-09 14:26 ` [PATCH 7.1.y 0/3] KVM: x86: Backports for VM entry failure due to stale CR8 intercept Sean Christopherson
3 siblings, 0 replies; 5+ messages in thread
From: Carlos López @ 2026-07-09 13:21 UTC (permalink / raw)
To: stable
Cc: kvm, linux-kernel, gregkh, Sean Christopherson, syzbot ci,
Paolo Bonzini, Carlos López, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, Dave Hansen,
maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT), H. Peter Anvin
From: Sean Christopherson <seanjc@google.com>
[ Upstream commit 7ef78d71ca713d8c00f7c34ddcf276c808143f77 ]
When updating CR8 intercepts, get vmcs12 if and only if the vCPU is in
guest mode so that a future change can have update CR8 intercepts during
vCPU creation, without running afoul of get_vmcs12()'s lockdep assertion.
------------[ cut here ]------------
debug_locks && !(lock_is_held(&(&vcpu->mutex)->dep_map) || !refcount_read(&vcpu->kvm->users_count))
WARNING: arch/x86/kvm/vmx/nested.h:61 at get_vmcs12 arch/x86/kvm/vmx/nested.h:60 [inline], CPU#0: syz.2.19/5879
WARNING: arch/x86/kvm/vmx/nested.h:61 at vmx_update_cr8_intercept+0x3de/0x4e0 arch/x86/kvm/vmx/vmx.c:6879, CPU#0: syz.2.19/5879
Modules linked in:
CPU: 0 UID: 0 PID: 5879 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:get_vmcs12 arch/x86/kvm/vmx/nested.h:60 [inline]
RIP: 0010:vmx_update_cr8_intercept+0x3de/0x4e0 arch/x86/kvm/vmx/vmx.c:6879
Call Trace:
<TASK>
apic_update_ppr arch/x86/kvm/lapic.c:984 [inline]
kvm_lapic_reset+0x1c24/0x2980 arch/x86/kvm/lapic.c:3023
kvm_vcpu_reset+0x44c/0x1bf0 arch/x86/kvm/x86.c:12986
kvm_arch_vcpu_create+0x746/0x8b0 arch/x86/kvm/x86.c:12847
kvm_vm_ioctl_create_vcpu+0x428/0x930 virt/kvm/kvm_main.c:4201
kvm_vm_ioctl+0x893/0xd50 virt/kvm/kvm_main.c:5159
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
</TASK>
No functional change intended.
Reported-by: syzbot ci <syzbot+ci493c6d734b63e050@syzkaller.appspotmail.com>
Closes: https://lore.kernel.org/all/6a2adf3b.3b0a2d4e.8c8d1.0012.GAE@google.com
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260618174347.1981064-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Carlos López <clopez@suse.de>
---
arch/x86/kvm/vmx/vmx.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index b9103de01428..719dfa6b780f 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6855,11 +6855,10 @@ int vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
void vmx_update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
{
- struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
int tpr_threshold;
if (is_guest_mode(vcpu) &&
- nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW))
+ nested_cpu_has(get_vmcs12(vcpu), CPU_BASED_TPR_SHADOW))
return;
guard(vmx_vmcs01)(vcpu);
--
2.51.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 7.1.y 3/3] KVM: x86: Unconditionally recompute CR8 intercept on PPR update
2026-07-09 13:21 [PATCH 7.1.y 0/3] KVM: x86: Backports for VM entry failure due to stale CR8 intercept Carlos López
2026-07-09 13:21 ` [PATCH 7.1.y 1/3] KVM: x86: Move update_cr8_intercept() to lapic.c Carlos López
2026-07-09 13:21 ` [PATCH 7.1.y 2/3] KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode Carlos López
@ 2026-07-09 13:21 ` Carlos López
2026-07-09 14:26 ` [PATCH 7.1.y 0/3] KVM: x86: Backports for VM entry failure due to stale CR8 intercept Sean Christopherson
3 siblings, 0 replies; 5+ messages in thread
From: Carlos López @ 2026-07-09 13:21 UTC (permalink / raw)
To: stable
Cc: kvm, linux-kernel, gregkh, Carlos López, Stefano Garzarella,
Sean Christopherson, Paolo Bonzini, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, Dave Hansen,
maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT), H. Peter Anvin,
Roman Kagan
[ Upstream commit bb365a506b1e6fb050c0fceaad354fe395385ef0 ]
The TPR_THRESHOLD field in the VMCS is used by VMX to induce VM exits
when the guest's virtual TPR falls under the specified threshold,
allowing KVM to inject previously masked interrupts.
KVM handles these VM exits in handle_tpr_below_threshold().
Commit eb90f3417a0c ("KVM: vmx: speed up TPR below threshold vmexits")
optimized this function by calling apic_update_ppr() instead of raising
KVM_REQ_EVENT. apic_update_ppr() then raises KVM_REQ_EVENT if there is
a pending, deliverable interrupt.
However, if there are no new interrupts pending, apic_update_ppr() does
not issue the request. Thus, kvm_lapic_update_cr8_intercept() and
vmx_update_cr8_intercept() are not called before VM entry, which results
in a high, stale TPR_THRESHOLD. This is problematic due to the following
sentence in 28.2.1.1 "VM-Execution Control Fields" in the SDM:
The following check is performed if the “use TPR shadow” VM-execution
control is 1 and the “virtualize APIC accesses” and “virtual-interrupt
delivery” VM-execution controls are both 0: the value of bits 3:0 of
the TPR threshold VM-execution control field should not be greater
than the value of bits 7:4 of VTPR.
This error condition is typically not observed when KVM runs on a bare
metal system because modern processors support APICv, which enables
virtual-interrupt delivery, and which KVM uses when possible. This
causes the processor to no longer generate TPR-below-threshold exits
and to no longer check TPR_THRESHOLD on entry. However, when running
on older platforms, or under nested virtualization on a hypervisor that
does not support virtual-interrupt delivery and enforces this check
(like Hyper-V) this can cause a VM entry failure with hardware error
0x7, as seen in [1].
Call kvm_lapic_update_cr8_intercept() if apic_update_ppr() does not
find a deliverable interrupt (and thus does not raise KVM_REQ_EVENT).
Remove calls to kvm_lapic_update_cr8_intercept() on paths that end up in
apic_update_ppr(), as they now become redundant. This ensures that any
path that updates the guest's PPR also figures out if KVM needs to wait
for a TPR change (using TPR_THRESHOLD on VMX or CR8 intercepts on SVM).
Link: https://github.com/coconut-svsm/svsm/issues/1081 [1]
Tested-by: Stefano Garzarella <sgarzare@redhat.com>
Cc: stable@vger.kernel.org
Fixes: eb90f3417a0c ("KVM: vmx: speed up TPR below threshold vmexits")
Signed-off-by: Carlos López <clopez@suse.de>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260618174347.1981064-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/lapic.c | 2 ++
arch/x86/kvm/x86.c | 5 +----
2 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index f4574b5a16d8..63e068ae2982 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -980,6 +980,8 @@ static void apic_update_ppr(struct kvm_lapic *apic)
if (__apic_update_ppr(apic, &ppr) &&
apic_has_interrupt_for_ppr(apic, ppr) != -1)
kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
+ else
+ kvm_lapic_update_cr8_intercept(apic->vcpu);
}
void kvm_apic_update_ppr(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2c5bc03292e3..485df779ae67 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5339,7 +5339,6 @@ static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
r = kvm_apic_set_state(vcpu, s);
if (r)
return r;
- kvm_lapic_update_cr8_intercept(vcpu);
return 0;
}
@@ -12453,8 +12452,6 @@ static int __set_sregs_common(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs,
kvm_register_mark_dirty(vcpu, VCPU_EXREG_CR3);
kvm_x86_call(post_set_cr3)(vcpu, sregs->cr3);
- kvm_set_cr8(vcpu, sregs->cr8);
-
*mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
kvm_x86_call(set_efer)(vcpu, sregs->efer);
@@ -12483,7 +12480,7 @@ static int __set_sregs_common(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs,
kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
- kvm_lapic_update_cr8_intercept(vcpu);
+ kvm_set_cr8(vcpu, sregs->cr8);
/* Older userspace won't unhalt the vcpu on reset. */
if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
--
2.51.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH 7.1.y 0/3] KVM: x86: Backports for VM entry failure due to stale CR8 intercept
2026-07-09 13:21 [PATCH 7.1.y 0/3] KVM: x86: Backports for VM entry failure due to stale CR8 intercept Carlos López
` (2 preceding siblings ...)
2026-07-09 13:21 ` [PATCH 7.1.y 3/3] KVM: x86: Unconditionally recompute CR8 intercept on PPR update Carlos López
@ 2026-07-09 14:26 ` Sean Christopherson
3 siblings, 0 replies; 5+ messages in thread
From: Sean Christopherson @ 2026-07-09 14:26 UTC (permalink / raw)
To: Carlos López; +Cc: stable, kvm, linux-kernel, gregkh
On Thu, Jul 09, 2026, Carlos López wrote:
> Backport for bb365a506b1e ("KVM: x86: Unconditionally recompute CR8
> intercept on PPR update") with two prerequisite patches.
>
> Carlos López (1):
> KVM: x86: Unconditionally recompute CR8 intercept on PPR update
>
> Sean Christopherson (2):
> KVM: x86: Move update_cr8_intercept() to lapic.c
> KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest
> mode
For the series,
Acked-by: Sean Christopherson <seanjc@google.com>
^ permalink raw reply [flat|nested] 5+ messages in thread