From: David Woodhouse <dwmw@amazon.co.uk> stable inclusion from stable-v5.11-rc1 commit 2e008ffe426f927b1697adb4ed10c1e419927ae4 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IC9GHN Reference: https://github.com/torvalds/linux/commit/2e008ffe426f927b1697adb4ed10c1e4199... -------------------------------- 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 Signed-off-by: Liu Chao <liuchao173@huawei.com> --- arch/x86/kernel/kvm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index f69199874592..740268d74535 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -817,6 +817,11 @@ 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(); @@ -846,6 +851,7 @@ 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, -- 2.33.0