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x86/kvm: Enable 15-bit extension when KVM_FEATURE_MSI_EXT_DEST_ID detected

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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
This commit is contained in:
David Woodhouse 2020-10-24 22:35:35 +01:00 committed by Thomas Gleixner
parent bf27ef8a77
commit 2e008ffe42
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kernel/kvm.c
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@ -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,