On 7/6/23 04:49, Suravee Suthikulpanit wrote:
Since KVM_MAX_VCPUS is currently defined to 1024 for x86 as shown in
arch/x86/include/asm/kvm_host.h, update QEMU limits to the same number.
In case KVM could not support the specified number of vcpus, QEMU would
return the following error message:
qemu-system-x86_64: kvm_init_vcpu: kvm_get_vcpu failed (xxx): Invalid
argument
Odd, we already check the upper limit with KVM_CAP_NR_VCPUS.
See in kvm_init():
/* check the vcpu limits */
soft_vcpus_limit = kvm_recommended_vcpus(s);
hard_vcpus_limit = kvm_max_vcpus(s);
When testing your series I get:
qemu-system-x86_64: -accel kvm: warning: Number of SMP cpus requested
(1024) exceeds the recommended cpus supported by KVM (710)
$ uname -srvp
Linux 5.15.0-71-generic #78-Ubuntu SMP Tue Apr 18 09:00:29 UTC 2023 x86_64
Also, keep max_cpus at 288 for machine version 8.0 and older.
Cc: Igor Mammedov <imamm...@redhat.com>
Cc: Daniel P. Berrangé <berra...@redhat.com>
Cc: Michael S. Tsirkin <m...@redhat.com>
Cc: Julia Suvorova <jus...@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
---
hw/i386/pc_q35.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
