diff options
| author | David Woodhouse <dwmw@amazon.co.uk> | 2020-10-24 23:35:35 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-10-28 20:26:33 +0100 |
| commit | 2e008ffe426f927b1697adb4ed10c1e419927ae4 (patch) | |
| tree | d0a210f326c8a9085f58078ae772f4efef1eaac9 /arch | |
| parent | iommu/hyper-v: Disable IRQ pseudo-remapping if 15 bit APIC IDs are available (diff) | |
| download | linux-2e008ffe426f927b1697adb4ed10c1e419927ae4.tar.xz linux-2e008ffe426f927b1697adb4ed10c1e419927ae4.zip | |
x86/kvm: Enable 15-bit extension when KVM_FEATURE_MSI_EXT_DEST_ID detected
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
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/kvm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 7f57ede3cb8e..5e78e01ca3b4 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -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, |