ppc/spapr: Implement H_RANDOM hypercall in QEMU

The PAPR interface defines a hypercall to pass high-quality
hardware generated random numbers to guests. Recent kernels can
already provide this hypercall to the guest if the right hardware
random number generator is available. But in case the user wants
to use another source like EGD, or QEMU is running with an older
kernel, we should also have this call in QEMU, so that guests that
do not support virtio-rng yet can get good random numbers, too.

This patch now adds a new pseudo-device to QEMU that either
directly provides this hypercall to the guest or is able to
enable the in-kernel hypercall if available. The in-kernel
hypercall can be enabled with the use-kvm property, e.g.:

 qemu-system-ppc64 -device spapr-rng,use-kvm=true

For handling the hypercall in QEMU instead, a "RngBackend" is
required since the hypercall should provide "good" random data
instead of pseudo-random (like from a "simple" library function
like rand() or g_random_int()). Since there are multiple RngBackends
available, the user must select an appropriate back-end via the
"rng" property of the device, e.g.:

 qemu-system-ppc64 -object rng-random,filename=/dev/hwrng,id=gid0 \
                   -device spapr-rng,rng=gid0 ...

See http://wiki.qemu-project.org/Features-Done/VirtIORNG for
other example of specifying RngBackends.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

2 files changed, 14 insertions, 0 deletions

diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
index 9cf5308ac3..e641680fb1 100644
--- a/target-ppc/kvm.c
+++ b/target-ppc/kvm.c
@@ -2489,3 +2489,12 @@ int kvm_arch_msi_data_to_gsi(uint32_t data)
 {
     return data & 0xffff;
 }
+
+int kvmppc_enable_hwrng(void)
+{
+    if (!kvm_enabled() || !kvm_check_extension(kvm_state, KVM_CAP_PPC_HWRNG)) {
+        return -1;
+    }
+
+    return kvmppc_enable_hcall(kvm_state, H_RANDOM);
+}
diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h
index f790d50e51..470f6d62f7 100644
--- a/target-ppc/kvm_ppc.h
+++ b/target-ppc/kvm_ppc.h
@@ -54,6 +54,7 @@ void kvmppc_hash64_free_pteg(uint64_t token);
 void kvmppc_hash64_write_pte(CPUPPCState *env, target_ulong pte_index,
                              target_ulong pte0, target_ulong pte1);
 bool kvmppc_has_cap_fixup_hcalls(void);
+int kvmppc_enable_hwrng(void);
 
 #else
 
@@ -251,6 +252,10 @@ static inline bool kvmppc_has_cap_fixup_hcalls(void)
     abort();
 }
 
+static inline int kvmppc_enable_hwrng(void)
+{
+    return -1;
+}
 #endif
 
 #ifndef CONFIG_KVM