From: Vitaly Kuznetsov vkuznets@redhat.com
[ Upstream commit 82cc27eff4486f8e79ef8faac1af1f5573039aa4 ]
KVM_CAP_NR_VCPUS is a legacy advisory value which on other architectures return num_online_cpus() caped by KVM_CAP_NR_VCPUS or something else (ppc and arm64 are special cases). On s390, KVM_CAP_NR_VCPUS returns the same as KVM_CAP_MAX_VCPUS and this may turn out to be a bad 'advice'. Switch s390 to returning caped num_online_cpus() too.
Acked-by: Christian Borntraeger borntraeger@de.ibm.com Signed-off-by: Vitaly Kuznetsov vkuznets@redhat.com Reviewed-by: Christian Borntraeger borntraeger@linux.ibm.com Message-Id: 20211116163443.88707-6-vkuznets@redhat.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/kvm/kvm-s390.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 05bd517528450..bc74a3056ac72 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -445,6 +445,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = KVM_MAX_VCPUS; else if (sclp.has_esca && sclp.has_64bscao) r = KVM_S390_ESCA_CPU_SLOTS; + if (ext == KVM_CAP_NR_VCPUS) + r = min_t(unsigned int, num_online_cpus(), r); break; case KVM_CAP_NR_MEMSLOTS: r = KVM_USER_MEM_SLOTS;
From: Vitaly Kuznetsov vkuznets@redhat.com
[ Upstream commit b7915d55b1ac0e68a7586697fa2d06c018135c49 ]
It doesn't make sense to return the recommended maximum number of vCPUs which exceeds the maximum possible number of vCPUs.
Signed-off-by: Vitaly Kuznetsov vkuznets@redhat.com Message-Id: 20211116163443.88707-4-vkuznets@redhat.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/kvm/powerpc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index af1f065dc9f37..d3832f1f17003 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -624,9 +624,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) * implementations just count online CPUs. */ if (hv_enabled) - r = num_present_cpus(); + r = min_t(unsigned int, num_present_cpus(), KVM_MAX_VCPUS); else - r = num_online_cpus(); + r = min_t(unsigned int, num_online_cpus(), KVM_MAX_VCPUS); break; case KVM_CAP_NR_MEMSLOTS: r = KVM_USER_MEM_SLOTS;
From: Vitaly Kuznetsov vkuznets@redhat.com
[ Upstream commit 57a2e13ebdda8b65602b44ec8b80e385603eb84c ]
It doesn't make sense to return the recommended maximum number of vCPUs which exceeds the maximum possible number of vCPUs.
Signed-off-by: Vitaly Kuznetsov vkuznets@redhat.com Message-Id: 20211116163443.88707-3-vkuznets@redhat.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/mips/kvm/mips.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index 8614225e92eb5..8733585385dee 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -1075,7 +1075,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = 1; break; case KVM_CAP_NR_VCPUS: - r = num_online_cpus(); + r = min_t(unsigned int, num_online_cpus(), KVM_MAX_VCPUS); break; case KVM_CAP_MAX_VCPUS: r = KVM_MAX_VCPUS;
linux-stable-mirror@lists.linaro.org
-
Sasha Levin