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authorDavid Woodhouse <dwmw@amazon.co.uk>2020-10-19 17:55:56 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2020-10-28 20:52:05 +0300
commit5a169bf04cd2bfdbac967d12eb5b70915b29d7ee (patch)
tree0b8757ba4296efe2ec1219a8ae429f0ea0373c5c /Documentation/virt
parent3650b228f83adda7e5ee532e2b90429c03f7b9ec (diff)
downloadlinux-5a169bf04cd2bfdbac967d12eb5b70915b29d7ee.tar.xz
x86/kvm: Reserve KVM_FEATURE_MSI_EXT_DEST_ID
No functional change; just reserve the feature bit for now so that VMMs can start to implement it. This will allow the host to indicate that MSI emulation supports 15-bit destination IDs, allowing up to 32768 CPUs without interrupt remapping. cf. https://patchwork.kernel.org/patch/11816693/ for qemu Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <4cd59bed05f4b7410d3d1ffd1e997ab53683874d.camel@infradead.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/virt')
-rw-r--r--Documentation/virt/kvm/cpuid.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/cpuid.rst b/Documentation/virt/kvm/cpuid.rst
index 7d81c0aa4a59..cf62162d4be2 100644
--- a/Documentation/virt/kvm/cpuid.rst
+++ b/Documentation/virt/kvm/cpuid.rst
@@ -92,6 +92,10 @@ KVM_FEATURE_ASYNC_PF_INT 14 guest checks this feature bit
async pf acknowledgment msr
0x4b564d07.
+KVM_FEATURE_MSI_EXT_DEST_ID 15 guest checks this feature bit
+ before using extended destination
+ ID bits in MSI address bits 11-5.
+
KVM_FEATURE_CLOCKSOURCE_STABLE_BIT 24 host will warn if no guest-side
per-cpu warps are expected in
kvmclock