PowerPC's PAPR L0 does not guarantee H_GUEST_CREATE/H_GUEST_CREATE_VCPU hcalls to create upto MAX_VCPUS or hundreds of VMs, this is due to limited resouces at L0 for guest management space. This helper allows us to skip such tests which creates a lot of VMs/VCPUs, when we are running nested.
Note that there is no easy way to differentiate between running nested on PowerNV v/s kvm-on-powervm case. So we use a common helper to detect any nested case. The helper is added to the common kvm_util header file to avoid sprinkling multiple #ifdef __powerpc64__ everywhere. Suggested-by: Sean Christopherson <[email protected]> Tested-by: Anushree Mathur <[email protected]> Signed-off-by: Ritesh Harjani (IBM) <[email protected]> --- tools/testing/selftests/kvm/include/kvm_util.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index 9df16c8dc82a..258ae5879a5e 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -14,6 +14,7 @@ #include <linux/kvm.h> #include "linux/rbtree.h" #include <linux/types.h> +#include <unistd.h> #include <asm/atomic.h> #include <asm/kvm.h> @@ -1063,6 +1064,22 @@ const char *exit_reason_str(unsigned int exit_reason); bool kvm_arch_needs_naturally_aligned_page_tables(void); +/* + * True on powerpc when this host is a pseries LPAR (nested case). + * PowerPC's PAPR L0 does not guarantee H_GUEST_CREATE / H_GUEST_CREATE_VCPU up + * to MAX_VCPUS or creating hundreds of VMs - due to limited resouces at L0 for + * guest management space. This helper allows us to skip such tests when we are + * running nested. + */ +static inline bool kvm_is_ppc_pseries_lpar(void) +{ +#ifdef __powerpc64__ + return !access("/proc/device-tree/rtas/ibm,hypertas-functions", F_OK); +#else + return false; +#endif +} + gpa_t ____vm_phy_pages_alloc(struct kvm_vm *vm, size_t nr_pages, gpa_t min_gpa, u32 memslot, bool protected, bool naturally_aligned); gpa_t __vm_phy_pages_alloc(struct kvm_vm *vm, size_t nr_pages, -- 2.39.5
