KVM: Don't pre-reserve xarray entries when storing empty/NULL attributesgrafted

Skip the xarray reservation loop when clearing all memory attributes, as
storing NULL only erases the entry and never needs to allocate, so no
reservation (and no cleanup of a failed one) is required in that case.

Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: David Ballesteros <davimaba.v@proton.me>
Signed-off-by: Zeng Chi <zengchi@kylinos.cn>
Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com
[sean: split to separate patch]
Signed-off-by: Sean Christopherson <seanjc@google.com>

1 files changed, 143 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
new file mode 100644
index 000000000..4bd9d1230
--- /dev/null
+++ b/arch/powerpc/kvm/Makefile
@@ -0,0 +1,143 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for Kernel-based Virtual Machine module
+#
+
+ccflags-y := -Ivirt/kvm -Iarch/powerpc/kvm
+
+include $(srctree)/virt/kvm/Makefile.kvm
+
+common-objs-y += powerpc.o emulate_loadstore.o
+obj-$(CONFIG_KVM_EXIT_TIMING) += timing.o
+obj-$(CONFIG_KVM_BOOK3S_HANDLER) += book3s_exports.o
+
+AFLAGS_booke_interrupts.o := -I$(objtree)/$(obj)
+
+kvm-e500-objs := \
+	$(common-objs-y) \
+	emulate.o \
+	booke.o \
+	booke_emulate.o \
+	booke_interrupts.o \
+	e500.o \
+	e500_mmu.o \
+	e500_mmu_host.o \
+	e500_emulate.o
+kvm-objs-$(CONFIG_KVM_E500V2) := $(kvm-e500-objs)
+
+kvm-e500mc-objs := \
+	$(common-objs-y) \
+	emulate.o \
+	booke.o \
+	booke_emulate.o \
+	bookehv_interrupts.o \
+	e500mc.o \
+	e500_mmu.o \
+	e500_mmu_host.o \
+	e500_emulate.o
+kvm-objs-$(CONFIG_KVM_E500MC) := $(kvm-e500mc-objs)
+
+kvm-pr-y := \
+	fpu.o \
+	emulate.o \
+	book3s_paired_singles.o \
+	book3s_pr.o \
+	book3s_pr_papr.o \
+	book3s_emulate.o \
+	book3s_interrupts.o \
+	book3s_mmu_hpte.o \
+	book3s_64_mmu_host.o \
+	book3s_64_mmu.o \
+	book3s_32_mmu.o
+
+kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HANDLER) += \
+	book3s_64_entry.o \
+	tm.o
+
+ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
+kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HANDLER) += \
+	book3s_rmhandlers.o
+endif
+
+kvm-hv-y += \
+	book3s_hv.o \
+	book3s_hv_interrupts.o \
+	book3s_64_mmu_hv.o \
+	book3s_64_mmu_radix.o \
+	book3s_hv_nested.o
+
+kvm-hv-$(CONFIG_PPC_UV) += \
+	book3s_hv_uvmem.o
+
+kvm-hv-$(CONFIG_PPC_TRANSACTIONAL_MEM) += \
+	book3s_hv_tm.o
+
+kvm-book3s_64-builtin-xics-objs-$(CONFIG_KVM_XICS) := \
+	book3s_hv_rm_xics.o
+
+kvm-book3s_64-builtin-tm-objs-$(CONFIG_PPC_TRANSACTIONAL_MEM) += \
+	book3s_hv_tm_builtin.o
+
+ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
+kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HANDLER) += \
+	book3s_hv_hmi.o \
+	book3s_hv_p9_entry.o \
+	book3s_hv_rmhandlers.o \
+	book3s_hv_rm_mmu.o \
+	book3s_hv_ras.o \
+	book3s_hv_builtin.o \
+	book3s_hv_p9_perf.o \
+	book3s_hv_nestedv2.o \
+	guest-state-buffer.o \
+	$(kvm-book3s_64-builtin-tm-objs-y) \
+	$(kvm-book3s_64-builtin-xics-objs-y)
+
+obj-$(CONFIG_GUEST_STATE_BUFFER_TEST) += test-guest-state-buffer.o
+endif
+
+kvm-book3s_64-objs-$(CONFIG_KVM_XICS) += \
+	book3s_xics.o
+
+kvm-book3s_64-objs-$(CONFIG_KVM_XIVE) += book3s_xive.o book3s_xive_native.o
+kvm-book3s_64-objs-$(CONFIG_SPAPR_TCE_IOMMU) += book3s_64_vio.o
+
+kvm-book3s_64-module-objs := \
+	$(common-objs-y) \
+	book3s.o \
+	book3s_rtas.o \
+	$(kvm-book3s_64-objs-y)
+
+kvm-objs-$(CONFIG_KVM_BOOK3S_64) := $(kvm-book3s_64-module-objs)
+
+kvm-book3s_32-objs := \
+	$(common-objs-y) \
+	emulate.o \
+	fpu.o \
+	book3s_paired_singles.o \
+	book3s.o \
+	book3s_pr.o \
+	book3s_emulate.o \
+	book3s_interrupts.o \
+	book3s_mmu_hpte.o \
+	book3s_32_mmu_host.o \
+	book3s_32_mmu.o
+kvm-objs-$(CONFIG_KVM_BOOK3S_32) := $(kvm-book3s_32-objs)
+
+kvm-objs-$(CONFIG_KVM_MPIC) += mpic.o
+
+kvm-y += $(kvm-objs-m) $(kvm-objs-y)
+
+obj-$(CONFIG_KVM_E500V2) += kvm.o
+obj-$(CONFIG_KVM_E500MC) += kvm.o
+obj-$(CONFIG_KVM_BOOK3S_64) += kvm.o
+obj-$(CONFIG_KVM_BOOK3S_32) += kvm.o
+
+obj-$(CONFIG_KVM_BOOK3S_64_PR) += kvm-pr.o
+obj-$(CONFIG_KVM_BOOK3S_64_HV) += kvm-hv.o
+
+obj-y += $(kvm-book3s_64-builtin-objs-y)
+
+# KVM does a lot in real-mode, and 64-bit Book3S KASAN doesn't support that
+ifdef CONFIG_PPC_BOOK3S_64
+KASAN_SANITIZE := n
+endif