KVM: arm64: nv: Emulate EL12 register accesses from the virtual EL2

With HCR_EL2.NV bit set, accesses to EL12 registers in the virtual EL2
trap to EL2. Handle those traps just like we do for EL1 registers.

One exception is CNTKCTL_EL12. We don't trap on CNTKCTL_EL1 for non-VHE
virtual EL2 because we don't have to. However, accessing CNTKCTL_EL12
will trap since it's one of the EL12 registers controlled by HCR_EL2.NV
bit. Therefore, add a handler for it and don't treat it as a
non-trap-registers when preparing a shadow context.

These registers, being only a view on their EL1 counterpart, are
permanently hidden from userspace.

Reviewed-by: Alexandru Elisei <[e-mail]>
Signed-off-by: Jintack Lim <[e-mail]>
[maz: EL12_REG(), register visibility]
Signed-off-by: Marc Zyngier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Oliver Upton <[e-mail]>

arch/arm64/kvm/sys_regs.c

···
 	.val = v,				\
 }
 
+/*
+ * EL{0,1}2 registers are the EL2 view on an EL0 or EL1 register when
+ * HCR_EL2.E2H==1, and only in the sysreg table for convenience of
+ * handling traps. Given that, they are always hidden from userspace.
+ */
+static unsigned int elx2_visibility(const struct kvm_vcpu *vcpu,
+				    const struct sys_reg_desc *rd)
+{
+	return REG_HIDDEN_USER;
+}
+
+#define EL12_REG(name, acc, rst, v) {		\
+	SYS_DESC(SYS_##name##_EL12),		\
+	.access = acc,				\
+	.reset = rst,				\
+	.reg = name##_EL1,			\
+	.val = v,				\
+	.visibility = elx2_visibility,		\
+}
+
 /* sys_reg_desc initialiser for known cpufeature ID registers */
 #define ID_SANITISED(name) {			\
 	SYS_DESC(SYS_##name),			\
···
 
 	EL2_REG(CNTVOFF_EL2, access_rw, reset_val, 0),
 	EL2_REG(CNTHCTL_EL2, access_rw, reset_val, 0),
+
+	EL12_REG(SCTLR, access_vm_reg, reset_val, 0x00C50078),
+	EL12_REG(CPACR, access_rw, reset_val, 0),
+	EL12_REG(TTBR0, access_vm_reg, reset_unknown, 0),
+	EL12_REG(TTBR1, access_vm_reg, reset_unknown, 0),
+	EL12_REG(TCR, access_vm_reg, reset_val, 0),
+	{ SYS_DESC(SYS_SPSR_EL12), access_spsr},
+	{ SYS_DESC(SYS_ELR_EL12), access_elr},
+	EL12_REG(AFSR0, access_vm_reg, reset_unknown, 0),
+	EL12_REG(AFSR1, access_vm_reg, reset_unknown, 0),
+	EL12_REG(ESR, access_vm_reg, reset_unknown, 0),
+	EL12_REG(FAR, access_vm_reg, reset_unknown, 0),
+	EL12_REG(MAIR, access_vm_reg, reset_unknown, 0),
+	EL12_REG(AMAIR, access_vm_reg, reset_amair_el1, 0),
+	EL12_REG(VBAR, access_rw, reset_val, 0),
+	EL12_REG(CONTEXTIDR, access_vm_reg, reset_val, 0),
+	EL12_REG(CNTKCTL, access_rw, reset_val, 0),
 
 	EL2_REG(SP_EL2, NULL, reset_unknown, 0),
 };