From 5a169bf04cd2bfdbac967d12eb5b70915b29d7ee Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Mon, 19 Oct 2020 15:55:56 +0100 Subject: 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 Acked-by: Paolo Bonzini Message-Id: <4cd59bed05f4b7410d3d1ffd1e997ab53683874d.camel@infradead.org> Signed-off-by: Paolo Bonzini --- Documentation/virt/kvm/cpuid.rst | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Documentation/virt') 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 -- cgit v1.2.3