This is a note to let you know that I've just added the patch titled KVM: arm64: Ensure I-cache isolation between vcpus of a same VM to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kvm-arm64-ensure-i-cache-isolation-between-vcpus-of-a-same-vm.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Mon Mar 15 12:27:33 PM CET 2021 From: Marc Zyngier <maz@xxxxxxxxxx> Date: Mon, 15 Mar 2021 11:10:00 +0000 Subject: KVM: arm64: Ensure I-cache isolation between vcpus of a same VM To: gregkh@xxxxxxxxxxxxxxxxxxx Cc: kvmarm@xxxxxxxxxxxxxxxxxxxxx, kernel-team@xxxxxxxxxxx, stable@xxxxxxxxxxxxxxx, Will Deacon <will@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx> Message-ID: <20210315111000.4136196-1-maz@xxxxxxxxxx> From: Marc Zyngier <maz@xxxxxxxxxx> Commit 01dc9262ff5797b675c32c0c6bc682777d23de05 upstream. It recently became apparent that the ARMv8 architecture has interesting rules regarding attributes being used when fetching instructions if the MMU is off at Stage-1. In this situation, the CPU is allowed to fetch from the PoC and allocate into the I-cache (unless the memory is mapped with the XN attribute at Stage-2). If we transpose this to vcpus sharing a single physical CPU, it is possible for a vcpu running with its MMU off to influence another vcpu running with its MMU on, as the latter is expected to fetch from the PoU (and self-patching code doesn't flush below that level). In order to solve this, reuse the vcpu-private TLB invalidation code to apply the same policy to the I-cache, nuking it every time the vcpu runs on a physical CPU that ran another vcpu of the same VM in the past. This involve renaming __kvm_tlb_flush_local_vmid() to __kvm_flush_cpu_context(), and inserting a local i-cache invalidation there. Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> Acked-by: Will Deacon <will@xxxxxxxxxx> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx> Link: https://lore.kernel.org/r/20210303164505.68492-1-maz@xxxxxxxxxx [maz: added 32bit ARM support] Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm/include/asm/kvm_asm.h | 2 +- arch/arm/kvm/hyp/tlb.c | 3 ++- arch/arm64/include/asm/kvm_asm.h | 2 +- arch/arm64/kvm/hyp/tlb.c | 3 ++- virt/kvm/arm/arm.c | 8 +++++++- 5 files changed, 13 insertions(+), 5 deletions(-) --- a/arch/arm/include/asm/kvm_asm.h +++ b/arch/arm/include/asm/kvm_asm.h @@ -56,7 +56,7 @@ extern char __kvm_hyp_init_end[]; extern void __kvm_flush_vm_context(void); extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa); extern void __kvm_tlb_flush_vmid(struct kvm *kvm); -extern void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu); +extern void __kvm_flush_cpu_context(struct kvm_vcpu *vcpu); extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high); --- a/arch/arm/kvm/hyp/tlb.c +++ b/arch/arm/kvm/hyp/tlb.c @@ -45,7 +45,7 @@ void __hyp_text __kvm_tlb_flush_vmid_ipa __kvm_tlb_flush_vmid(kvm); } -void __hyp_text __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu) +void __hyp_text __kvm_flush_cpu_context(struct kvm_vcpu *vcpu) { struct kvm *kvm = kern_hyp_va(kern_hyp_va(vcpu)->kvm); @@ -54,6 +54,7 @@ void __hyp_text __kvm_tlb_flush_local_vm isb(); write_sysreg(0, TLBIALL); + write_sysreg(0, ICIALLU); dsb(nsh); isb(); --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -60,7 +60,7 @@ extern char __kvm_hyp_vector[]; extern void __kvm_flush_vm_context(void); extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa); extern void __kvm_tlb_flush_vmid(struct kvm *kvm); -extern void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu); +extern void __kvm_flush_cpu_context(struct kvm_vcpu *vcpu); extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high); --- a/arch/arm64/kvm/hyp/tlb.c +++ b/arch/arm64/kvm/hyp/tlb.c @@ -182,7 +182,7 @@ void __hyp_text __kvm_tlb_flush_vmid(str __tlb_switch_to_host(kvm, &cxt); } -void __hyp_text __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu) +void __hyp_text __kvm_flush_cpu_context(struct kvm_vcpu *vcpu) { struct kvm *kvm = kern_hyp_va(kern_hyp_va(vcpu)->kvm); struct tlb_inv_context cxt; @@ -191,6 +191,7 @@ void __hyp_text __kvm_tlb_flush_local_vm __tlb_switch_to_guest(kvm, &cxt); __tlbi(vmalle1); + asm volatile("ic iallu"); dsb(nsh); isb(); --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -373,11 +373,17 @@ void kvm_arch_vcpu_load(struct kvm_vcpu cpu_data = this_cpu_ptr(&kvm_host_data); /* + * We guarantee that both TLBs and I-cache are private to each + * vcpu. If detecting that a vcpu from the same VM has + * previously run on the same physical CPU, call into the + * hypervisor code to nuke the relevant contexts. + * + * We might get preempted before the vCPU actually runs, but * We might get preempted before the vCPU actually runs, but * over-invalidation doesn't affect correctness. */ if (*last_ran != vcpu->vcpu_id) { - kvm_call_hyp(__kvm_tlb_flush_local_vmid, vcpu); + kvm_call_hyp(__kvm_flush_cpu_context, vcpu); *last_ran = vcpu->vcpu_id; } Patches currently in stable-queue which might be from maz@xxxxxxxxxx are queue-5.4/kvm-arm64-reject-vm-creation-when-the-default-ipa-size-is-unsupported.patch queue-5.4/kvm-arm64-ensure-i-cache-isolation-between-vcpus-of-a-same-vm.patch queue-5.4/kvm-arm64-fix-exclusive-limit-for-ipa-size.patch