x86/kvm: Enable 15-bit extension when KVM_FEATURE_MSI_EXT_DEST_ID detected (2e008ffe) · Commits · 戴 / test

This allows 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> Signed-off-by:

Thomas Gleixner <tglx@linutronix.de> Acked-by:

Paolo Bonzini <pbonzini@redhat.com> Link: https://lore.kernel.org/r/20201024213535.443185-36-dwmw2@infradead.org

arch/x86/kernel/kvm.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -740,6 +740,11 @@ static void __init kvm_apic_init(void)
		#endif
		}

		static bool __init kvm_msi_ext_dest_id(void)
		{
		return kvm_para_has_feature(KVM_FEATURE_MSI_EXT_DEST_ID);
		}

		static void __init kvm_init_platform(void)
		{
		kvmclock_init();
		@@ -769,6 +774,7 @@ const __initconst struct hypervisor_x86 x86_hyper_kvm = {
		.type = X86_HYPER_KVM,
		.init.guest_late_init = kvm_guest_init,
		.init.x2apic_available = kvm_para_available,
		.init.msi_ext_dest_id = kvm_msi_ext_dest_id,
		.init.init_platform = kvm_init_platform,
		#if defined(CONFIG_AMD_MEM_ENCRYPT)
		.runtime.sev_es_hcall_prepare = kvm_sev_es_hcall_prepare,

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