[Xen-devel] [PATCH v4 18/19] xen/arm: vpsci: Introduce and use PSCI_INVALID_ADDRESS

[Julien Grall <julien.grall@xxxxxxx>]

PSCI 1.0 added the error return PSCI_INVALID_ADDRESS. It is used to
indicate the entry point address is known to be invalid.

In Xen case, this error could be returned when a 64-bit vCPU is using a
Thumb entry address.

For PSCI 0.1 implementation, return PSCI_INVALID_PARAMETERS instead.

Suggested-by: mirela.simonovic@xxxxxxxxxx
Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: mirela.simonovic@xxxxxxxxxx

---
    Changes in v4:
        - Add Stefano's reviewed-by

    Changes in v3:
        - Patch added
---
 xen/arch/arm/vpsci.c       | 10 +++++++---
 xen/include/asm-arm/psci.h |  1 +
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/xen/arch/arm/vpsci.c b/xen/arch/arm/vpsci.c
index 9a082aa6ee..1729f7071e 100644
--- a/xen/arch/arm/vpsci.c
+++ b/xen/arch/arm/vpsci.c
@@ -38,7 +38,7 @@ static int do_common_cpu_on(register_t target_cpu, register_t 
entry_point,
 
     /* THUMB set is not allowed with 64-bit domain */
     if ( is_64bit_domain(d) && is_thumb )
-        return PSCI_INVALID_PARAMETERS;
+        return PSCI_INVALID_ADDRESS;
 
     if ( !test_bit(_VPF_down, &v->pause_flags) )
         return PSCI_ALREADY_ON;
@@ -99,10 +99,14 @@ static int32_t do_psci_cpu_on(uint32_t vcpuid, register_t 
entry_point)
 
     ret = do_common_cpu_on(vcpuid, entry_point, 0);
     /*
-     * PSCI 0.1 does not define the return code PSCI_ALREADY_ON.
+     * PSCI 0.1 does not define the return codes PSCI_ALREADY_ON and
+     * PSCI_INVALID_ADDRESS.
      * Instead, return PSCI_INVALID_PARAMETERS.
      */
-    return (ret == PSCI_ALREADY_ON) ? PSCI_INVALID_PARAMETERS : ret;
+    if ( ret == PSCI_ALREADY_ON || ret == PSCI_INVALID_ADDRESS )
+        ret = PSCI_INVALID_PARAMETERS;
+
+    return ret;
 }
 
 static int32_t do_psci_cpu_off(uint32_t power_state)
diff --git a/xen/include/asm-arm/psci.h b/xen/include/asm-arm/psci.h
index e2629eed01..9ac820e94a 100644
--- a/xen/include/asm-arm/psci.h
+++ b/xen/include/asm-arm/psci.h
@@ -13,6 +13,7 @@
 #define PSCI_INTERNAL_FAILURE       -6
 #define PSCI_NOT_PRESENT            -7
 #define PSCI_DISABLED               -8
+#define PSCI_INVALID_ADDRESS        -9
 
 /* availability of PSCI on the host for SMP bringup */
 extern uint32_t psci_ver;
-- 
2.11.0


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