x86/kvm: Reserve KVM_FEATURE_MSI_EXT_DEST_ID (5a169bf0) · Commits · 戴 / test

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>

Documentation/virt/kvm/cpuid.rst

+4 −0

Original line number	Diff line number	Diff line
		@@ -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

arch/x86/include/uapi/asm/kvm_para.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -32,6 +32,7 @@
		#define KVM_FEATURE_POLL_CONTROL 12
		#define KVM_FEATURE_PV_SCHED_YIELD 13
		#define KVM_FEATURE_ASYNC_PF_INT 14
		#define KVM_FEATURE_MSI_EXT_DEST_ID 15

		#define KVM_HINTS_REALTIME 0

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