[PATCH 26/60] kvm: Introduce arch-specific plane state
From: Jörg Rödel <joro@8bytes.org>
Date: 2026-06-08 14:43:19
Also in:
kvm, kvm-riscv, kvmarm, linux-mips, lkml, loongarch
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine (kvm), kernel virtual machine for arm64 (kvm/arm64), kernel virtual machine for loongarch (kvm/loongarch), kernel virtual machine for mips (kvm/mips), kernel virtual machine for powerpc (kvm/powerpc), kernel virtual machine for risc-v (kvm/riscv), kernel virtual machine for x86 (kvm/x86), kernel virtual machine for s390 (kvm/s390), linux for powerpc (32-bit and 64-bit), loongarch, mips, risc-v architecture, s390 architecture, the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Catalin Marinas, Will Deacon, Paolo Bonzini, Marc Zyngier, Oliver Upton, Tianrui Zhao, Bibo Mao, Huacai Chen, Madhavan Srinivasan, Anup Patel, Sean Christopherson, Christian Borntraeger, Janosch Frank, Claudio Imbrenda, Michael Ellerman, Thomas Bogendoerfer, Paul Walmsley, Palmer Dabbelt, Albert Ou, Heiko Carstens, Vasily Gorbik, Alexander Gordeev, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Joerg Roedel <redacted> Introduce struct kvm_arch_plane which is per architecture and will be used to store architecture-specific per-plane state. Signed-off-by: Joerg Roedel <redacted> --- arch/arm64/include/asm/kvm_host.h | 12 ++++++++++++ arch/loongarch/include/asm/kvm_host.h | 12 ++++++++++++ arch/mips/include/asm/kvm_host.h | 12 ++++++++++++ arch/powerpc/include/asm/kvm_host.h | 12 ++++++++++++ arch/riscv/include/asm/kvm_host.h | 12 ++++++++++++ arch/s390/include/asm/kvm_host.h | 12 ++++++++++++ arch/x86/include/asm/kvm_host.h | 12 ++++++++++++ include/linux/kvm_host.h | 2 ++ include/linux/kvm_types.h | 1 + virt/kvm/kvm_main.c | 9 +++++++++ 10 files changed, 96 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 32dc484781f0..e9cca2adb371 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h@@ -306,6 +306,18 @@ enum fgt_group_id { __NR_FGT_GROUP_IDS__ }; +/* Per-plane state of VM */ +struct kvm_arch_plane {}; + +static inline int kvm_arch_plane_init(struct kvm *kvm, + struct kvm_plane *plane, + unsigned plane_level) +{ + return 0; +} + +static inline void kvm_arch_plane_destroy(struct kvm_plane *plane) {} + struct kvm_arch { struct kvm_s2_mmu mmu;
diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include/asm/kvm_host.h
index 776bc487a705..225aa87ebbdd 100644
--- a/arch/loongarch/include/asm/kvm_host.h
+++ b/arch/loongarch/include/asm/kvm_host.h@@ -116,6 +116,18 @@ struct kvm_phyid_map { struct kvm_phyid_info phys_map[KVM_MAX_PHYID]; }; +/* Per-plane state of VM */ +struct kvm_arch_plane {}; + +static inline int kvm_arch_plane_init(struct kvm *kvm, + struct kvm_plane *plane, + unsigned plane_level) +{ + return 0; +} + +static inline void kvm_arch_plane_destroy(struct kvm_plane *plane) {} + struct kvm_arch { /* Guest physical mm */ kvm_pte_t *pgd;
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index c14b10821817..b01911eb9064 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h@@ -172,6 +172,18 @@ struct loongson_kvm_ipi { }; #endif +/* Per-plane state of VM */ +struct kvm_arch_plane {}; + +static inline int kvm_arch_plane_init(struct kvm *kvm, + struct kvm_plane *plane, + unsigned plane_level) +{ + return 0; +} + +static inline void kvm_arch_plane_destroy(struct kvm_plane *plane) {} + struct kvm_arch { /* Guest physical mm */ struct mm_struct gpa_mm;
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 2d139c807577..c5b9fbaf34f3 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h@@ -269,6 +269,18 @@ struct kvm_hpt_info { struct kvm_resize_hpt; +/* Per-plane state of VM */ +struct kvm_arch_plane {}; + +static inline int kvm_arch_plane_init(struct kvm *kvm, + struct kvm_plane *plane, + unsigned plane_level) +{ + return 0; +} + +static inline void kvm_arch_plane_destroy(struct kvm_plane *plane) {} + /* Flag values for kvm_arch.secure_guest */ #define KVMPPC_SECURE_INIT_START 0x1 /* H_SVM_INIT_START has been called */ #define KVMPPC_SECURE_INIT_DONE 0x2 /* H_SVM_INIT_DONE completed */
diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
index 75b0a951c1bc..bcbf487d4cb7 100644
--- a/arch/riscv/include/asm/kvm_host.h
+++ b/arch/riscv/include/asm/kvm_host.h@@ -76,6 +76,18 @@ struct kvm_vcpu_stat { struct kvm_arch_memory_slot { }; +/* Per-plane state of VM */ +struct kvm_arch_plane {}; + +static inline int kvm_arch_plane_init(struct kvm *kvm, + struct kvm_plane *plane, + unsigned plane_level) +{ + return 0; +} + +static inline void kvm_arch_plane_destroy(struct kvm_plane *plane) {} + struct kvm_arch { /* G-stage vmid */ struct kvm_vmid vmid;
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 8a4f4a39f7a2..bb3bfbfd35d8 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h@@ -638,6 +638,18 @@ struct kvm_s390_pv { struct kvm_s390_mmu_cache; +/* Per-plane state of VM */ +struct kvm_arch_plane {}; + +static inline int kvm_arch_plane_init(struct kvm *kvm, + struct kvm_plane *plane, + unsigned plane_level) +{ + return 0; +} + +static inline void kvm_arch_plane_destroy(struct kvm_plane *plane) {} + struct kvm_arch { struct esca_block *sca; debug_info_t *dbf;
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 43c92f0ada1e..dd95c70bfdba 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h@@ -1412,6 +1412,18 @@ enum kvm_mmu_type { KVM_NR_MMU_TYPES, }; +/* Per-plane state of VM */ +struct kvm_arch_plane {}; + +static inline int kvm_arch_plane_init(struct kvm *kvm, + struct kvm_plane *plane, + unsigned plane_level) +{ + return 0; +} + +static inline void kvm_arch_plane_destroy(struct kvm_plane *plane) {} + struct kvm_arch { unsigned long n_used_mmu_pages; unsigned long n_requested_mmu_pages;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 7d06459a06f3..4a0eaa1de479 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h@@ -847,6 +847,8 @@ struct kvm_plane { /* Per-Plane VCPU array */ struct xarray vcpu_array; + + struct kvm_arch_plane arch; }; struct kvm {
diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
index a568d8e6f4e8..07e82928c948 100644
--- a/include/linux/kvm_types.h
+++ b/include/linux/kvm_types.h@@ -42,6 +42,7 @@ struct kvm_interrupt; struct kvm_irq_routing_table; struct kvm_memory_slot; struct kvm_one_reg; +struct kvm_plane; struct kvm_run; struct kvm_userspace_memory_region; struct kvm_vcpu;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index f85ddb0fc781..91fb9abf9b31 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c@@ -1211,13 +1211,22 @@ static struct kvm_plane *kvm_create_plane(struct kvm *kvm, unsigned plane_level) xa_init(&plane->vcpu_array); + if (kvm_arch_plane_init(kvm, plane, plane_level)) + goto out_free_plane; + kvm->planes[plane_level] = plane; return plane; + +out_free_plane: + kfree(plane); + + return NULL; } static void kvm_destroy_one_plane(struct kvm_plane *plane) { + kvm_arch_plane_destroy(plane); kfree(plane); }
--
2.53.0