From fd7bb4a251dfc1da3496bf59a4793937c13e8c1f Mon Sep 17 00:00:00 2001 From: Anup Patel Date: Mon, 27 Sep 2021 17:10:08 +0530 Subject: RISC-V: KVM: Implement VMID allocator We implement a simple VMID allocator for Guests/VMs which: 1. Detects number of VMID bits at boot-time 2. Uses atomic number to track VMID version and increments VMID version whenever we run-out of VMIDs 3. Flushes Guest TLBs on all host CPUs whenever we run-out of VMIDs 4. Force updates HW Stage2 VMID for each Guest VCPU whenever VMID changes using VCPU request KVM_REQ_UPDATE_HGATP Signed-off-by: Anup Patel Acked-by: Paolo Bonzini Reviewed-by: Paolo Bonzini Reviewed-by: Alexander Graf Acked-by: Palmer Dabbelt --- arch/riscv/kvm/vm.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/riscv/kvm/vm.c') diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c index ad38c575c0bd..42e75dc8ab06 100644 --- a/arch/riscv/kvm/vm.c +++ b/arch/riscv/kvm/vm.c @@ -41,6 +41,12 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) if (r) return r; + r = kvm_riscv_stage2_vmid_init(kvm); + if (r) { + kvm_riscv_stage2_free_pgd(kvm); + return r; + } + return 0; } -- cgit v1.2.3