From 004a01241c5a0d375266ebf1c72f208de99294e9 Mon Sep 17 00:00:00 2001 From: Andrew Jones Date: Tue, 4 Aug 2020 19:06:04 +0200 Subject: arm64/x86: KVM: Introduce steal-time cap arm64 requires a vcpu fd (KVM_HAS_DEVICE_ATTR vcpu ioctl) to probe support for steal-time. However this is unnecessary, as only a KVM fd is required, and it complicates userspace (userspace may prefer delaying vcpu creation until after feature probing). Introduce a cap that can be checked instead. While x86 can already probe steal-time support with a kvm fd (KVM_GET_SUPPORTED_CPUID), we add the cap there too for consistency. Signed-off-by: Andrew Jones Signed-off-by: Marc Zyngier Reviewed-by: Steven Price Link: https://lore.kernel.org/r/20200804170604.42662-7-drjones@redhat.com --- arch/x86/kvm/x86.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/x86') diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 599d73206299..c44d3a73b8eb 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3581,6 +3581,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_SMALLER_MAXPHYADDR: r = (int) allow_smaller_maxphyaddr; break; + case KVM_CAP_STEAL_TIME: + r = sched_info_on(); + break; default: break; } -- cgit v1.2.3