diff options
| author | Sean Christopherson <seanjc@google.com> | 2022-09-28 23:36:52 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-09-30 06:39:34 -0400 |
| commit | c96409d1e58905bfc8c73b630481228382ab8846 (patch) | |
| tree | e7c4c95dab7982359aaa403ffc3386fcc2c42804 /tools/testing/selftests/kvm/lib/x86_64 | |
| parent | 53c9bdb922f40a7abf3b1642f8a39d3b94d10d62 (diff) | |
| download | linux-c96409d1e58905bfc8c73b630481228382ab8846.tar.bz2 | |
Revert "KVM: selftests: Fix nested SVM tests when built with clang"
Revert back to using memset() in generic_svm_setup() now that KVM
selftests override memset() and friends specifically to prevent the
compiler from generating fancy code and/or linking to the libc
implementation.
This reverts commit ed290e1c20da19fa100a3e0f421aa31b65984960.
Suggested-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220928233652.783504-8-seanjc@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/testing/selftests/kvm/lib/x86_64')
| -rw-r--r-- | tools/testing/selftests/kvm/lib/x86_64/svm.c | 14 |
1 files changed, 1 insertions, 13 deletions
diff --git a/tools/testing/selftests/kvm/lib/x86_64/svm.c b/tools/testing/selftests/kvm/lib/x86_64/svm.c index 6d445886e16c..5495a92dfd5a 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/svm.c +++ b/tools/testing/selftests/kvm/lib/x86_64/svm.c @@ -60,18 +60,6 @@ static void vmcb_set_seg(struct vmcb_seg *seg, u16 selector, seg->base = base; } -/* - * Avoid using memset to clear the vmcb, since libc may not be - * available in L1 (and, even if it is, features that libc memset may - * want to use, like AVX, may not be enabled). - */ -static void clear_vmcb(struct vmcb *vmcb) -{ - int n = sizeof(*vmcb) / sizeof(u32); - - asm volatile ("rep stosl" : "+c"(n), "+D"(vmcb) : "a"(0) : "memory"); -} - void generic_svm_setup(struct svm_test_data *svm, void *guest_rip, void *guest_rsp) { struct vmcb *vmcb = svm->vmcb; @@ -88,7 +76,7 @@ void generic_svm_setup(struct svm_test_data *svm, void *guest_rip, void *guest_r wrmsr(MSR_EFER, efer | EFER_SVME); wrmsr(MSR_VM_HSAVE_PA, svm->save_area_gpa); - clear_vmcb(vmcb); + memset(vmcb, 0, sizeof(*vmcb)); asm volatile ("vmsave %0\n\t" : : "a" (vmcb_gpa) : "memory"); vmcb_set_seg(&save->es, get_es(), 0, -1U, data_seg_attr); vmcb_set_seg(&save->cs, get_cs(), 0, -1U, code_seg_attr); |