Emulate TLBI ALLE2(IS) instruction executed in the virtual EL2. Since we
emulate the virtual EL2 in the EL1, we invalidate EL1&0 regime stage 1
TLB entries with setting vttbr_el2 having the VMID of the virtual EL2.
Note that we are able to emulate TLBI ALLE2IS precisely by only
invalidating stage 1 TLB entries via TLBI VMALL1IS instruction, but to
make it simeple, we reuse the existing function, __kvm_tlb_flush_vmid(),
which invalidates both of stage 1 and 2 TLB entries.
Signed-off-by: Jintack Lim <jintack.lim@xxxxxxxxxx>
---
arch/arm64/kvm/sys_regs.c | 35 +++++++++++++++++++++++++++++++++--
1 file changed, 33 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 7950ee0..90329b7 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1747,6 +1747,37 @@ static bool handle_s12w(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
return handle_s12(vcpu, p, r, true);
}
+static bool handle_alle2(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ struct kvm_s2_mmu *mmu = &vcpu->kvm->arch.mmu;
+ u64 vttbr = kvm_get_vttbr(&mmu->el2_vmid, mmu);
+
+ /*
+ * To emulate invalidating all EL2 regime stage 1 TLB entries,
+ * invalidate EL1&0 regime stage 1 TLB entries with the virtual EL2's
+ * VMID.
+ */
+ kvm_call_hyp(__kvm_tlb_flush_local_vmid, vttbr);
+ return true;
+}
+
+static bool handle_alle2is(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ struct kvm_s2_mmu *mmu = &vcpu->kvm->arch.mmu;
+ u64 vttbr = kvm_get_vttbr(&mmu->el2_vmid, mmu);
+
+ /*
+ * To emulate invalidating all EL2 regime stage 1 TLB entries for all
+ * PEs, executing TLBI VMALLE1IS is enough. But reuse the existing
+ * interface for the simplicity; invalidating stage 2 entries doesn't
+ * affect the correctness.
+ */
+ kvm_call_hyp(__kvm_tlb_flush_vmid, vttbr);
+ return true;
+}
+
/*
* AT instruction emulation
*
@@ -1830,14 +1861,14 @@ static bool handle_s12w(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
SYS_INSN_TO_DESC(AT_S12E0W, handle_s12w, NULL),
SYS_INSN_TO_DESC(TLBI_IPAS2E1IS, NULL, NULL),
SYS_INSN_TO_DESC(TLBI_IPAS2LE1IS, NULL, NULL),
- SYS_INSN_TO_DESC(TLBI_ALLE2IS, NULL, NULL),
+ SYS_INSN_TO_DESC(TLBI_ALLE2IS, handle_alle2is, NULL),
SYS_INSN_TO_DESC(TLBI_VAE2IS, NULL, NULL),
SYS_INSN_TO_DESC(TLBI_ALLE1IS, NULL, NULL),
SYS_INSN_TO_DESC(TLBI_VALE2IS, NULL, NULL),
SYS_INSN_TO_DESC(TLBI_VMALLS12E1IS, NULL, NULL),
SYS_INSN_TO_DESC(TLBI_IPAS2E1, NULL, NULL),
SYS_INSN_TO_DESC(TLBI_IPAS2LE1, NULL, NULL),
- SYS_INSN_TO_DESC(TLBI_ALLE2, NULL, NULL),
+ SYS_INSN_TO_DESC(TLBI_ALLE2, handle_alle2, NULL),
SYS_INSN_TO_DESC(TLBI_VAE2, NULL, NULL),
SYS_INSN_TO_DESC(TLBI_ALLE1, NULL, NULL),
SYS_INSN_TO_DESC(TLBI_VALE2, NULL, NULL),
--
1.9.1
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