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Tue, 06 Oct 2026 03:30:09 -0700 (PDT) From: "Ritesh Harjani (IBM)" To: kvm@vger.kernel.org, Sean Christopherson Cc: Paolo Bonzini , linuxppc-dev@lists.ozlabs.org, Michael Ellerman , Christophe Leroy , Anushree Mathur , Venkat Rao Bagalkote , Harsh Prateek Bora , Madhavan Srinivasan , Shrikanth Hegde , linux-kernel@vger.kernel.org, "Ritesh Harjani (IBM)" Subject: [PATCH v7 5/8] KVM: selftests: Add helper for checking if running on powerpc pseries LPAR Date: Tue, 6 Oct 2026 15:58:39 +0530 Message-Id: <294c0fcd19d6b00626e230985cf9906f98934d1c.1791280439.git.ritesh.list@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 Tested-by: Anushree Mathur Signed-off-by: Ritesh Harjani (IBM) --- 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 #include "linux/rbtree.h" #include +#include #include #include @@ -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