Same spiel as the 6.1.y collection...
This is a collection of backports for patches that were Cc'd to stable, but failed to apply, along with their dependencies.
Note, Sasha already posted[1][2] these (and I acked them):
KVM: VMX: Allow guest to set DEBUGCTL.RTM_DEBUG if RTM is supported KVM: x86/pmu: Gate all "unimplemented MSR" prints on report_ignored_msrs KVM: VMX: Extract checking of guest's DEBUGCTL into helper KVM: nVMX: Check vmcs12->guest_ia32_debugctl on nested VM-Enter KVM: VMX: Wrap all accesses to IA32_DEBUGCTL with getter/setter APIs
I'm including them here to hopefully make life easier for y'all, and because the order they are presented here is the preferred ordering, i.e. should be the same ordering as the original upstream patches.
But, if you end up grabbing Sasha's patches first, it's not a big deal as the only true dependencies is that the DEBUGCTL.RTM_DEBUG patch needs to land before "Check vmcs12->guest_ia32_debugctl on nested VM-Enter".
Many of the patches to get to the last patch (the DEBUGCTLMSR_FREEZE_IN_SMM fix) are dependencies that arguably shouldn't be backported to LTS kernels. I opted to do the backports because none of the patches are scary (if it was 1-3 dependency patches instead of 8 I wouldn't hesitate), and there's a decent chance they'll be dependencies for future fixes.
[1] https://lore.kernel.org/all/20250813183728.2070321-1-sashal@kernel.org [2] https://lore.kernel.org/all/20250814131146.2093579-1-sashal@kernel.org
Chao Gao (1): KVM: nVMX: Defer SVI update to vmcs01 on EOI when L2 is active w/o VID
Manuel Andreas (1): KVM: x86/hyper-v: Skip non-canonical addresses during PV TLB flush
Maxim Levitsky (3): KVM: nVMX: Check vmcs12->guest_ia32_debugctl on nested VM-Enter KVM: VMX: Wrap all accesses to IA32_DEBUGCTL with getter/setter APIs KVM: VMX: Preserve host's DEBUGCTLMSR_FREEZE_IN_SMM while running the guest
Sean Christopherson (15): KVM: SVM: Set RFLAGS.IF=1 in C code, to get VMRUN out of the STI shadow KVM: x86: Plumb in the vCPU to kvm_x86_ops.hwapic_isr_update() KVM: x86: Take irqfds.lock when adding/deleting IRQ bypass producer KVM: x86: Snapshot the host's DEBUGCTL in common x86 KVM: x86: Snapshot the host's DEBUGCTL after disabling IRQs KVM: x86: Plumb "force_immediate_exit" into kvm_entry() tracepoint KVM: VMX: Re-enter guest in fastpath for "spurious" preemption timer exits KVM: VMX: Handle forced exit due to preemption timer in fastpath KVM: x86: Move handling of is_guest_mode() into fastpath exit handlers KVM: VMX: Handle KVM-induced preemption timer exits in fastpath for L2 KVM: x86: Fully defer to vendor code to decide how to force immediate exit KVM: x86: Convert vcpu_run()'s immediate exit param into a generic bitmap KVM: x86: Drop kvm_x86_ops.set_dr6() in favor of a new KVM_RUN flag KVM: VMX: Allow guest to set DEBUGCTL.RTM_DEBUG if RTM is supported KVM: VMX: Extract checking of guest's DEBUGCTL into helper
arch/x86/include/asm/kvm-x86-ops.h | 2 - arch/x86/include/asm/kvm_host.h | 22 ++-- arch/x86/include/asm/msr-index.h | 1 + arch/x86/kvm/hyperv.c | 3 + arch/x86/kvm/lapic.c | 19 +++- arch/x86/kvm/lapic.h | 1 + arch/x86/kvm/svm/svm.c | 42 +++++--- arch/x86/kvm/svm/vmenter.S | 9 +- arch/x86/kvm/trace.h | 9 +- arch/x86/kvm/vmx/nested.c | 26 ++++- arch/x86/kvm/vmx/pmu_intel.c | 8 +- arch/x86/kvm/vmx/vmx.c | 164 +++++++++++++++++++---------- arch/x86/kvm/vmx/vmx.h | 31 +++++- arch/x86/kvm/x86.c | 46 +++++--- 14 files changed, 265 insertions(+), 118 deletions(-)
base-commit: 3a8ababb8b6a0ced2be230b60b6e3ddbd8d67014