Signed-off-by: Andy Lutomirski <l...@amacapital.net>
---
config/config-x86-common.mak | 5 ++++-
x86/get_rng_seed.c | 50 ++++++++++++++++++++++++++++++++++++++++++++
x86/unittests.cfg | 3 +++
3 files changed, 57 insertions(+), 1 deletion(-)
create mode 100644 x86/get_rng_seed.c
diff --git a/config/config-x86-common.mak b/config/config-x86-common.mak
index 0b0da85..201a029 100644
--- a/config/config-x86-common.mak
+++ b/config/config-x86-common.mak
@@ -35,7 +35,8 @@ tests-common = $(TEST_DIR)/vmexit.flat $(TEST_DIR)/tsc.flat \
$(TEST_DIR)/kvmclock_test.flat $(TEST_DIR)/eventinj.flat \
$(TEST_DIR)/s3.flat $(TEST_DIR)/pmu.flat \
$(TEST_DIR)/tsc_adjust.flat $(TEST_DIR)/asyncpf.flat \
- $(TEST_DIR)/init.flat $(TEST_DIR)/smap.flat
+ $(TEST_DIR)/init.flat $(TEST_DIR)/smap.flat \
+ $(TEST_DIR)/get_rng_seed.flat
ifdef API
tests-common += api/api-sample
@@ -105,6 +106,8 @@ $(TEST_DIR)/vmx.elf: $(cstart.o) $(TEST_DIR)/vmx.o
$(TEST_DIR)/vmx_tests.o
$(TEST_DIR)/debug.elf: $(cstart.o) $(TEST_DIR)/debug.o
+$(TEST_DIR)/get_rng_seed.elf: $(cstart.o) $(TEST_DIR)/get_rng_seed.o
+
arch_clean:
$(RM) $(TEST_DIR)/*.o $(TEST_DIR)/*.flat $(TEST_DIR)/*.elf \
$(TEST_DIR)/.*.d lib/x86/.*.d
diff --git a/x86/get_rng_seed.c b/x86/get_rng_seed.c
new file mode 100644
index 0000000..b2e1b01
--- /dev/null
+++ b/x86/get_rng_seed.c
@@ -0,0 +1,50 @@
+/*
+ * Simple test for MSR_KVM_GET_RNG_SEED.
+ */
+#include "x86/msr.h"
+#include "x86/processor.h"
+#include "x86/apic-defs.h"
+#include "x86/apic.h"
+#include "x86/desc.h"
+#include "x86/isr.h"
+#include "x86/vm.h"
+
+#include "libcflat.h"
+#include <stdint.h>
+
+#define MSR_KVM_GET_RNG_SEED 0x4b564d05
+
+volatile int ngpfs;
+bool fail;
+
+static void gpf_isr(struct ex_regs *r)
+{
+ ngpfs++;
+ r->rip += 2;
+}
+
+int main(int ac, char **av)
+{
+ int loop = 3;
+ u64 val, prev = 0;
+
+ setup_vm();
+ setup_idt();
+ while(loop--) {
+ val = rdmsr(MSR_KVM_GET_RNG_SEED);
+ printf("rng seed: %llx\n", (unsigned long)val);
+ if (val == prev)
+ fail = true;
+ prev = val;
+ }
+
+ handle_exception(13, gpf_isr);
+ wrmsr(MSR_KVM_GET_RNG_SEED, 0);
+ if (ngpfs != 1) {
+ printf("error: wrmsr(MSR_KVM_GET_RNG_SEED) should not work\n");
+ fail = true;
+ }
+
+ printf("%s\n", fail ? "FAIL" : "PASS");
+ return fail;
+}
diff --git a/x86/unittests.cfg b/x86/unittests.cfg
index d78fe0e..98e5c7b 100644
--- a/x86/unittests.cfg
+++ b/x86/unittests.cfg
@@ -158,3 +158,6 @@ arch = x86_64
[debug]
file = debug.flat
arch = x86_64
+
+[get_rng_seed]
+file = get_rnd_seed.flat
--
1.9.3
--
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