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With hardware assisted virtualization, there are two level HW mmu, one is GVA to GPA mapping, the other is GPA to HPA mapping which is called secondary mmu in generic. If there is page fault for secondary mmu, there needs tlb flush operation indexed with fault GPA address and VMID. VMID is stored at register CSR.GSTAT and will be reload or recalculated before guest entry. Currently CSR.GSTAT is not saved and restored during VCPU context switch, instead it is recalculated during guest entry. So CSR.GSTAT is effective only when a VCPU runs in guest mode, however it may not be effective if the VCPU exits to host mode. Since register CSR.GSTAT may be stale, it may records the VMID of the last schedule-out VCPU, rather than the current VCPU. Function kvm_flush_tlb_gpa() should be called with its real VMID, so here move it to the guest entrance. Also an arch-specific request id KVM_REQ_TLB_FLUSH_GPA is added to flush tlb for secondary mmu, and it can be optimized if VMID is updated, since all guest tlb entries will be invalid if VMID is updated. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
30 lines
665 B
C
30 lines
665 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020-2023 Loongson Technology Corporation Limited
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*/
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#include <linux/kvm_host.h>
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#include <asm/tlb.h>
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#include <asm/kvm_csr.h>
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/*
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* kvm_flush_tlb_all() - Flush all root TLB entries for guests.
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*
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* Invalidate all entries including GVA-->GPA and GPA-->HPA mappings.
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*/
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void kvm_flush_tlb_all(void)
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{
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unsigned long flags;
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local_irq_save(flags);
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invtlb_all(INVTLB_ALLGID, 0, 0);
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local_irq_restore(flags);
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}
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void kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa)
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{
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lockdep_assert_irqs_disabled();
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gpa &= (PAGE_MASK << 1);
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invtlb(INVTLB_GID_ADDR, read_csr_gstat() & CSR_GSTAT_GID, gpa);
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}
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