linux-dev/tools/testing/selftests/kvm/lib/x86_64, branch master

KVM: selftests: Fix nx_huge_pages_test on TDP-disabled hosts

2022-09-30T10:39:36Z

Map the test's huge page region with 2MiB virtual mappings when TDP is disabled so that KVM can shadow the region with huge pages. This fixes nx_huge_pages_test on hosts where TDP hardware support is disabled. Purposely do not skip this test on TDP-disabled hosts. While we don't care about NX Huge Pages on TDP-disabled hosts from a security perspective, KVM does support it, and so we should test it. For TDP-enabled hosts, continue mapping the region with 4KiB pages to ensure that KVM can map it with huge pages irrespective of the guest mappings. Fixes: 8448ec5993be ("KVM: selftests: Add NX huge pages test") Signed-off-by: David Matlack Message-Id: <20220929181207.2281449-4-dmatlack@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Add helpers to read kvm_{intel,amd} boolean module parameters

2022-09-30T10:39:36Z

Add helper functions for reading the value of kvm_intel and kvm_amd boolean module parameters. Use the kvm_intel variant in vm_is_unrestricted_guest() to simplify the check for kvm_intel.unrestricted_guest. No functional change intended. Signed-off-by: David Matlack Message-Id: <20220929181207.2281449-3-dmatlack@google.com> Signed-off-by: Paolo Bonzini

Revert "KVM: selftests: Fix nested SVM tests when built with clang"

2022-09-30T10:39:34Z

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 Signed-off-by: Sean Christopherson Message-Id: <20220928233652.783504-8-seanjc@google.com> Reviewed-by: Jim Mattson Signed-off-by: Paolo Bonzini

KVM: selftests: Skip tests that require EPT when it is not available

2022-09-27T11:58:03Z

Skip selftests that require EPT support in the VM when it is not available. For example, if running on a machine where kvm_intel.ept=N since KVM does not offer EPT support to guests if EPT is not supported on the host. This commit causes vmx_dirty_log_test to be skipped instead of failing on hosts where kvm_intel.ept=N. Signed-off-by: David Matlack Message-Id: <20220926171457.532542-1-dmatlack@google.com> Signed-off-by: Paolo Bonzini

selftests: kvm: set rax before vmcall

2022-08-01T12:43:05Z

kvm_hypercall has to place the hypercall number in rax. Trace events show that kvm_pv_test doesn't work properly: kvm_pv_test-53132: kvm_hypercall: nr 0x0 a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-53132: kvm_hypercall: nr 0x0 a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-53132: kvm_hypercall: nr 0x0 a0 0x0 a1 0x0 a2 0x0 a3 0x0 With this change, it starts working as expected: kvm_pv_test-54285: kvm_hypercall: nr 0x5 a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-54285: kvm_hypercall: nr 0xa a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-54285: kvm_hypercall: nr 0xb a0 0x0 a1 0x0 a2 0x0 a3 0x0 Signed-off-by: Andrei Vagin Message-Id: <20220722230241.1944655-5-avagin@google.com> Fixes: ac4a4d6de22e ("selftests: kvm: test enforcement of paravirtual cpuid features") Signed-off-by: Paolo Bonzini

KVM: selftests: Use the common cpuid() helper in cpu_vendor_string_is()

2022-07-14T01:14:25Z

Use cpuid() to get CPUID.0x0 in cpu_vendor_string_is(), thus eliminating the last open coded usage of CPUID (ignoring debug_regs.c, which emits CPUID from the guest to trigger a VM-Exit and doesn't actually care about the results of CPUID). Signed-off-by: Sean Christopherson Link: https://lore.kernel.org/r/20220614200707.3315957-42-seanjc@google.com

KVM: selftests: Clean up requirements for XFD-aware XSAVE features

2022-07-14T01:14:24Z

Provide informative error messages for the various checks related to requesting access to XSAVE features that are buried behind XSAVE Feature Disabling (XFD). Opportunistically rename the helper to have "require" in the name so that it's somewhat obvious that the helper may skip the test. Signed-off-by: Sean Christopherson Link: https://lore.kernel.org/r/20220614200707.3315957-41-seanjc@google.com

KVM: selftests: Skip AMX test if ARCH_REQ_XCOMP_GUEST_PERM isn't supported

2022-07-14T01:14:24Z

Skip the AMX test instead of silently returning if the host kernel doesn't support ARCH_REQ_XCOMP_GUEST_PERM. KVM didn't support XFD until v5.17, so it's extremely unlikely allowing the test to run on a pre-v5.15 kernel is the right thing to do. Signed-off-by: Sean Christopherson Link: https://lore.kernel.org/r/20220614200707.3315957-40-seanjc@google.com

KVM: selftests: Check KVM's supported CPUID, not host CPUID, for XFD

2022-07-14T01:14:24Z

Use kvm_cpu_has() to check for XFD supported in vm_xsave_req_perm(), simply checking host CPUID doesn't guarantee KVM supports AMX/XFD. Opportunistically hoist the check above the bit check; if XFD isn't supported, it's far better to get a "not supported at all" message, as opposed to a "feature X isn't supported" message". Signed-off-by: Sean Christopherson Link: https://lore.kernel.org/r/20220614200707.3315957-39-seanjc@google.com

KVM: selftests: Inline "get max CPUID leaf" helpers

2022-07-14T01:14:23Z

Make the "get max CPUID leaf" helpers static inline, there's no reason to bury the one liners in processor.c. Signed-off-by: Sean Christopherson Link: https://lore.kernel.org/r/20220614200707.3315957-38-seanjc@google.com