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: NAnup Patel <anup.patel@wdc.com> Acked-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NAlexander Graf <graf@amazon.com> Acked-by: NPalmer Dabbelt <palmerdabbelt@google.com>
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arch/riscv/kvm/tlb.S
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arch/riscv/kvm/vmid.c
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