On 30/07/21 14:26, Vitaly Kuznetsov wrote:
"KVM: x86: hyper-v: Fine-grained access check to Hyper-V hypercalls and
MSRs" and "Add support for XMM fast hypercalls" series were developed
at the same time so the later landed without a proper feature bit check
for 'strict' (KVM_CAP_HYPERV_ENFORCE_CPUID) mode. Add it now.
TLFS states that "Availability of the XMM fast hypercall interface is
indicated via the “Hypervisor Feature Identification” CPUID Leaf
(0x40000003, see section 2.4.4) ... Any attempt to use this interface
when the hypervisor does not indicate availability will result in a #UD
fault."
Vitaly Kuznetsov (4):
KVM: x86: hyper-v: Check access to hypercall before reading XMM
registers
KVM: x86: Introduce trace_kvm_hv_hypercall_done()
KVM: x86: hyper-v: Check if guest is allowed to use XMM registers for
hypercall input
KVM: selftests: Test access to XMM fast hypercalls
arch/x86/kvm/hyperv.c | 18 ++++++--
arch/x86/kvm/trace.h | 15 +++++++
.../selftests/kvm/include/x86_64/hyperv.h | 5 ++-
.../selftests/kvm/x86_64/hyperv_features.c | 41 +++++++++++++++++--
4 files changed, 71 insertions(+), 8 deletions(-)
Queued, thanks.
Paolo
