kvm: selftests: Add KVM_CAP_MAX_VCPU_ID cap test

mainline inclusion
from mainline-v6.0-rc1
commit 753dcf7a
category: feature
feature: IPI Virtualization
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5ODSC
CVE: N/A
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=753dcf7a8686a750fa6aa4b4ca42c6945fc75ac1



Intel-SIG: commit 753dcf7a ("kvm: selftests: Add KVM_CAP_MAX_VCPU_ID cap test")

-------------------------------------

kvm: selftests: Add KVM_CAP_MAX_VCPU_ID cap test

Basic test coverage of KVM_CAP_MAX_VCPU_ID cap.

This capability can be enabled before vCPU creation and only allowed
to set once. if assigned vcpu id is beyond KVM_CAP_MAX_VCPU_ID
capability, vCPU creation will fail.

Signed-off-by: Zeng Guang <guang.zeng@intel.com>
Message-Id: <20220422134456.26655-1-guang.zeng@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>