KVM: arm64: Add support for PSCI v1.2 and v1.3

As with PSCI v1.1 in commit 512865d83fd9 ("KVM: arm64: Bump guest PSCI
version to 1.1"), expose v1.3 to the guest by default. The SYSTEM_OFF2
call which is exposed by doing so is compatible for userspace because
it's just a new flag in the event that KVM raises, in precisely the same
way that SYSTEM_RESET2 was compatible when v1.1 was enabled by default.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Miguel Luis <miguel.luis@oracle.com>
Link: https://lore.kernel.org/r/20241019172459.2241939-4-dwmw2@infradead.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

diff --git a/arch/arm64/kvm/hypercalls.c b/arch/arm64/kvm/hypercalls.c
index 5763d979d8cae00ac206a6f80f10c2d36f86bdac..9c6267ca2b820de102311140d3060a98c214333a 100644 (file)
--- a/arch/arm64/kvm/hypercalls.c
+++ b/arch/arm64/kvm/hypercalls.c
@@ -575,6 +575,8 @@ int kvm_arm_set_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
                case KVM_ARM_PSCI_0_2:
                case KVM_ARM_PSCI_1_0:
                case KVM_ARM_PSCI_1_1:
+               case KVM_ARM_PSCI_1_2:
+               case KVM_ARM_PSCI_1_3:
                        if (!wants_02)
                                return -EINVAL;
                        vcpu->kvm->arch.psci_version = val;

diff --git a/arch/arm64/kvm/psci.c b/arch/arm64/kvm/psci.c
index 5d5fb3743b1c9beca65868b814177dec80873f02..3b5dbe9a0a0ea021e27502a2c0936c699f6a2bb5 100644 (file)
--- a/arch/arm64/kvm/psci.c
+++ b/arch/arm64/kvm/psci.c
@@ -328,7 +328,7 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
 
        switch(psci_fn) {
        case PSCI_0_2_FN_PSCI_VERSION:
-               val = minor == 0 ? KVM_ARM_PSCI_1_0 : KVM_ARM_PSCI_1_1;
+               val = PSCI_VERSION(1, minor);
                break;
        case PSCI_1_0_FN_PSCI_FEATURES:
                arg = smccc_get_arg1(vcpu);
@@ -487,6 +487,10 @@ int kvm_psci_call(struct kvm_vcpu *vcpu)
        }
 
        switch (version) {
+       case KVM_ARM_PSCI_1_3:
+               return kvm_psci_1_x_call(vcpu, 3);
+       case KVM_ARM_PSCI_1_2:
+               return kvm_psci_1_x_call(vcpu, 2);
        case KVM_ARM_PSCI_1_1:
                return kvm_psci_1_x_call(vcpu, 1);
        case KVM_ARM_PSCI_1_0:

diff --git a/include/kvm/arm_psci.h b/include/kvm/arm_psci.h
index e8fb624013d15c275fdfff258826ca90b3bb35da..cbaec804eb839233b8946ae8ecee9119adfb30ff 100644 (file)
--- a/include/kvm/arm_psci.h
+++ b/include/kvm/arm_psci.h
@@ -14,8 +14,10 @@
 #define KVM_ARM_PSCI_0_2       PSCI_VERSION(0, 2)
 #define KVM_ARM_PSCI_1_0       PSCI_VERSION(1, 0)
 #define KVM_ARM_PSCI_1_1       PSCI_VERSION(1, 1)
+#define KVM_ARM_PSCI_1_2       PSCI_VERSION(1, 2)
+#define KVM_ARM_PSCI_1_3       PSCI_VERSION(1, 3)
 
-#define KVM_ARM_PSCI_LATEST    KVM_ARM_PSCI_1_1
+#define KVM_ARM_PSCI_LATEST    KVM_ARM_PSCI_1_3
 
 static inline int kvm_psci_version(struct kvm_vcpu *vcpu)
 {