According to section "Canonicalization and Consistency Checks" in APM vol. 2 the following guest state combinations are illegal: * EFER.LME and CR0.PG are both set and CR4.PAE is zero. * EFER.LME and CR0.PG are both non-zero and CR0.PE is zero. * EFER.LME, CR0.PG, CR4.PAE, CS.L, and CS.D are all non-zero Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx> --- x86/svm_tests.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/x86/svm_tests.c b/x86/svm_tests.c index 1908c7c..43208fd 100644 --- a/x86/svm_tests.c +++ b/x86/svm_tests.c @@ -1962,7 +1962,51 @@ static void test_efer(void) SVM_TEST_REG_RESERVED_BITS(16, 63, 4, "EFER", vmcb->save.efer, efer_saved, SVM_EFER_RESERVED_MASK); + /* + * EFER.LME and CR0.PG are both set and CR4.PAE is zero. + */ + u64 cr0_saved = vmcb->save.cr0; + u64 cr0; + u64 cr4_saved = vmcb->save.cr4; + u64 cr4; + + efer = efer_saved | EFER_LME; + vmcb->save.efer = efer; + cr0 = cr0_saved | X86_CR0_PG; + vmcb->save.cr0 = cr0; + cr4 = cr4_saved & ~X86_CR4_PAE; + vmcb->save.cr4 = cr4; + report(svm_vmrun() == SVM_EXIT_ERR, "EFER.LME=1 (%lx), " + "CR0.PG=1 (%lx) and CR4.PAE=0 (%lx)", efer, cr0, cr4); + + /* + * EFER.LME and CR0.PG are both set and CR0.PE is zero. + */ + vmcb->save.cr4 = cr4_saved; + cr0 &= ~X86_CR0_PE; + vmcb->save.cr0 = cr0; + report(svm_vmrun() == SVM_EXIT_ERR, "EFER.LME=1 (%lx), " + "CR0.PG=1 and CR0.PE=0 (%lx)", efer, cr0); + + /* + * EFER.LME, CR0.PG, CR4.PAE, CS.L, and CS.D are all non-zero. + */ + u32 cs_attrib_saved = vmcb->save.cs.attrib; + u32 cs_attrib; + + cr4 = cr4_saved | X86_CR4_PAE; + vmcb->save.cr4 = cr4; + cs_attrib = cs_attrib_saved | SVM_SELECTOR_L_MASK | + SVM_SELECTOR_DB_MASK; + vmcb->save.cs.attrib = cs_attrib; + report(svm_vmrun() == SVM_EXIT_ERR, "EFER.LME=1 (%lx), " + "CR0.PG=1 (%lx), CR4.PAE=1 (%lx), CS.L=1 and CS.D=1 (%x)", + efer, cr0, cr4, cs_attrib); + + vmcb->save.cr4 = cr4_saved; + vmcb->save.cs.attrib = cs_attrib_saved; vmcb->save.efer = efer_saved; + vmcb->save.cr0 = cr0_saved; } static void test_cr0(void) -- 2.18.4
