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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2022-05-25 13:59:48 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-05-25 21:26:35 +0200 |
| commit | 3aae0854b26aff303202c6f9542445f58b2539fe (patch) | |
| tree | 3ed994c14b2231190f4e3b70ce09d78260276766 /docs | |
| parent | aa6bb5fad58d049c6ea97448d4caba4499d60634 (diff) | |
| download | qemu-3aae0854b26aff303202c6f9542445f58b2539fe.zip qemu-3aae0854b26aff303202c6f9542445f58b2539fe.tar.gz qemu-3aae0854b26aff303202c6f9542445f58b2539fe.tar.bz2 | |
i386: Hyper-V Direct TLB flush hypercall
Hyper-V TLFS allows for L0 and L1 hypervisors to collaborate on L2's
TLB flush hypercalls handling. With the correct setup, L2's TLB flush
hypercalls can be handled by L0 directly, without the need to exit to
L1.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20220525115949.1294004-6-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/hyperv.txt | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/hyperv.txt b/docs/hyperv.txt index 4b132b1..14a7f44 100644 --- a/docs/hyperv.txt +++ b/docs/hyperv.txt @@ -262,6 +262,17 @@ Allow for extended GVA ranges to be passed to Hyper-V TLB flush hypercalls Requires: hv-tlbflush +3.25. hv-tlbflush-direct +========================= +The enlightenment is nested specific, it targets Hyper-V on KVM guests. When +enabled, it allows L0 (KVM) to directly handle TLB flush hypercalls from L2 +guest without the need to exit to L1 (Hyper-V) hypervisor. While the feature is +supported for both VMX (Intel) and SVM (AMD), the VMX implementation requires +Enlightened VMCS ('hv-evmcs') feature to also be enabled. + +Requires: hv-vapic +Recommended: hv-evmcs (Intel) + 4. Supplementary features ========================= |