Emulate AT S1E[01] instructions by issuing the same instructions in EL2. We
set the physical EL1 registers, NV and NV1 bits as described in the AT
instruction emulation overview.
Signed-off-by: Jintack Lim <jintack.lim@xxxxxxxxxx>
---
arch/arm64/include/asm/kvm_emulate.h | 11 +++++++++++
arch/arm64/kvm/sys_regs.c | 32 ++++++++++++++++++++++++++------
2 files changed, 37 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 4c47bc7..a494db2 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -185,6 +185,17 @@ static inline bool vcpu_el2_tge_is_set(const struct kvm_vcpu *vcpu)
return (vcpu_sys_reg(vcpu, HCR_EL2) & HCR_TGE);
}
+
+/*
+ * When the NV and NV1 bits are set, the EL2 page table format is used for the
+ * EL1 translation regime.
+ */
+static inline bool vcpu_el2_format_used(const struct kvm_vcpu *vcpu)
+{
+ return ((vcpu_sys_reg(vcpu, HCR_EL2) & HCR_NV) &&
+ (vcpu_sys_reg(vcpu, HCR_EL2) & HCR_NV1));
+}
+
static inline bool is_hyp_ctxt(const struct kvm_vcpu *vcpu)
{
/*
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index d8728cc..a82274f 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1621,6 +1621,26 @@ static bool access_id_aa64mmfr0_el1(struct kvm_vcpu *v,
{ SYS_DESC(SYS_SP_EL2), NULL, reset_special, SP_EL2, 0},
};
+static bool handle_s1e01(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ struct kvm_cpu_context *ctxt = &vcpu->arch.ctxt;
+ bool el2_format;
+ int sys_encoding = sys_insn(p->Op0, p->Op1, p->CRn, p->CRm, p->Op2);
+
+ /* See '2. EL0/EL1 AT instructions: S1E[01]x, S12E1x' table. */
+ if (vcpu_el2_e2h_is_set(vcpu) && vcpu_el2_tge_is_set(vcpu))
+ ctxt->hw_sys_regs = ctxt->shadow_sys_regs;
+ else
+ ctxt->hw_sys_regs = ctxt->sys_regs;
+
+ el2_format = vcpu_el2_format_used(vcpu);
+
+ kvm_call_hyp(__kvm_at_insn, vcpu, p->regval, el2_format, sys_encoding);
+
+ return true;
+}
+
/*
* AT instruction emulation
*
@@ -1690,12 +1710,12 @@ static bool access_id_aa64mmfr0_el1(struct kvm_vcpu *v,
#define SYS_INSN_TO_DESC(insn, access_fn, forward_fn) \
{ SYS_DESC((insn)), (access_fn), NULL, 0, 0, NULL, NULL, (forward_fn) }
static struct sys_reg_desc sys_insn_descs[] = {
- SYS_INSN_TO_DESC(AT_S1E1R, NULL, NULL),
- SYS_INSN_TO_DESC(AT_S1E1W, NULL, NULL),
- SYS_INSN_TO_DESC(AT_S1E0R, NULL, NULL),
- SYS_INSN_TO_DESC(AT_S1E0W, NULL, NULL),
- SYS_INSN_TO_DESC(AT_S1E1RP, NULL, NULL),
- SYS_INSN_TO_DESC(AT_S1E1WP, NULL, NULL),
+ SYS_INSN_TO_DESC(AT_S1E1R, handle_s1e01, NULL),
+ SYS_INSN_TO_DESC(AT_S1E1W, handle_s1e01, NULL),
+ SYS_INSN_TO_DESC(AT_S1E0R, handle_s1e01, NULL),
+ SYS_INSN_TO_DESC(AT_S1E0W, handle_s1e01, NULL),
+ SYS_INSN_TO_DESC(AT_S1E1RP, handle_s1e01, NULL),
+ SYS_INSN_TO_DESC(AT_S1E1WP, handle_s1e01, NULL),
SYS_INSN_TO_DESC(AT_S1E2R, NULL, NULL),
SYS_INSN_TO_DESC(AT_S1E2W, NULL, NULL),
SYS_INSN_TO_DESC(AT_S12E1R, NULL, NULL),
--
1.9.1
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