Re: Nested paging in nested SVM setup

[Paolo Bonzini <pbonzini@redhat.com>]

Il 21/08/2014 10:48, Valentine Sinitsyn ha scritto:
> 
> No kvm_apic: after NPTs are set up, no page faults caused by register
> read (error_code: d), to trap and emulate APIC access.

It seems to work for VMX (see the testcase I just sent).  For SVM, can you
check if this test works for you, so that we can work on a simple testcase?

The patch applies to git://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git
and you can run the test like this (64-bit host):

   ./configure
   make
   ./x86-run x86/svm.flat -cpu host

Paolo

diff --git a/x86/svm.c b/x86/svm.c
index a9b29b1..aff00da 100644
--- a/x86/svm.c
+++ b/x86/svm.c
@@ -797,6 +797,27 @@ static bool npt_pfwalk_check(struct test *test)
 	   && (test->vmcb->control.exit_info_2 == read_cr3());
 }
 
+static void npt_l1mmio_prepare(struct test *test)
+{
+    vmcb_ident(test->vmcb);
+}
+
+u32 nested_apic_version;
+
+static void npt_l1mmio_test(struct test *test)
+{
+    u64 *data = (void*)(0xfee00030UL);
+
+    nested_apic_version = *data;
+}
+
+static bool npt_l1mmio_check(struct test *test)
+{
+    u64 *data = (void*)(0xfee00030);
+
+    return (nested_apic_version == *data);
+}
+
 static void latency_prepare(struct test *test)
 {
     default_prepare(test);
@@ -962,6 +983,8 @@ static struct test tests[] = {
 	    default_finished, npt_rw_check },
     { "npt_pfwalk", npt_supported, npt_pfwalk_prepare, null_test,
 	    default_finished, npt_pfwalk_check },
+    { "npt_l1mmio", npt_supported, npt_l1mmio_prepare, npt_l1mmio_test,
+	    default_finished, npt_l1mmio_check },
     { "latency_run_exit", default_supported, latency_prepare, latency_test,
       latency_finished, latency_check },
     { "latency_svm_insn", default_supported, lat_svm_insn_prepare, null_test,