Messages in this thread | | | From | Vitaly Kuznetsov <> | Subject | [PATCH v2 0/5] KVM: x86: hyper-v: Conditionally allow SynIC with APICv/AVIC | Date | Tue, 18 May 2021 16:43:34 +0200 |
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Changes since v1 (Sean): - Use common 'enable_apicv' variable for both APICv and AVIC instead of adding a new hook to 'struct kvm_x86_ops'. - Drop unneded CONFIG_X86_LOCAL_APIC checks from VMX/SVM code along the way.
Original description:
APICV_INHIBIT_REASON_HYPERV is currently unconditionally forced upon SynIC activation as SynIC's AutoEOI is incompatible with APICv/AVIC. It is, however, possible to track whether the feature was actually used by the guest and only inhibit APICv/AVIC when needed.
The feature can be tested with QEMU's 'hv-passthrough' debug mode.
Note, 'avic' kvm-amd module parameter is '0' by default and thus needs to be explicitly enabled.
Vitaly Kuznetsov (5): KVM: SVM: Drop unneeded CONFIG_X86_LOCAL_APIC check for AVIC KVM: VMX: Drop unneeded CONFIG_X86_LOCAL_APIC check from cpu_has_vmx_posted_intr() KVM: x86: Use common 'enable_apicv' variable for both APICv and AVIC KVM: x86: Invert APICv/AVIC enablement check KVM: x86: hyper-v: Deactivate APICv only when AutoEOI feature is in use
arch/x86/include/asm/kvm_host.h | 5 ++++- arch/x86/kvm/hyperv.c | 27 +++++++++++++++++++++------ arch/x86/kvm/svm/avic.c | 16 +++++----------- arch/x86/kvm/svm/svm.c | 24 +++++++++++++----------- arch/x86/kvm/svm/svm.h | 2 -- arch/x86/kvm/vmx/capabilities.h | 4 +--- arch/x86/kvm/vmx/vmx.c | 2 -- arch/x86/kvm/x86.c | 9 ++++++--- 8 files changed, 50 insertions(+), 39 deletions(-)
-- 2.31.1
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