diff --git a/arch/powerpc/include/asm/xive-regs.h b/arch/powerpc/include/asm/xive-regs.h index 8b211faa0e42..cf8bb6ac4463 100644 --- a/arch/powerpc/include/asm/xive-regs.h +++ b/arch/powerpc/include/asm/xive-regs.h @@ -80,10 +80,13 @@ #define TM_QW0W2_VU PPC_BIT32(0) #define TM_QW0W2_LOGIC_SERV PPC_BITMASK32(1,31) // XX 2,31 ? #define TM_QW1W2_VO PPC_BIT32(0) +#define TM_QW1W2_HO PPC_BIT32(1) /* P10 XIVE2 */ #define TM_QW1W2_OS_CAM PPC_BITMASK32(8,31) #define TM_QW2W2_VP PPC_BIT32(0) +#define TM_QW2W2_HP PPC_BIT32(1) /* P10 XIVE2 */ #define TM_QW2W2_POOL_CAM PPC_BITMASK32(8,31) #define TM_QW3W2_VT PPC_BIT32(0) +#define TM_QW3W2_HT PPC_BIT32(1) /* P10 XIVE2 */ #define TM_QW3W2_LP PPC_BIT32(6) #define TM_QW3W2_LE PPC_BIT32(7) #define TM_QW3W2_T PPC_BIT32(31) diff --git a/arch/powerpc/include/asm/xive.h b/arch/powerpc/include/asm/xive.h index 20ae50ab083c..92930b0b5d0e 100644 --- a/arch/powerpc/include/asm/xive.h +++ b/arch/powerpc/include/asm/xive.h @@ -126,6 +126,7 @@ int xive_native_enable_vp(u32 vp_id, bool single_escalation); int xive_native_disable_vp(u32 vp_id); int xive_native_get_vp_info(u32 vp_id, u32 *out_cam_id, u32 *out_chip_id); bool xive_native_has_single_escalation(void); +bool xive_native_has_save_restore(void); int xive_native_get_queue_info(u32 vp_id, uint32_t prio, u64 *out_qpage, diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c index 555cc610e7ab..912c1e9eef6b 100644 --- a/arch/powerpc/kvm/book3s_xive.c +++ b/arch/powerpc/kvm/book3s_xive.c @@ -59,6 +59,25 @@ */ #define XIVE_Q_GAP 2 +static bool kvmppc_xive_vcpu_has_save_restore(struct kvm_vcpu *vcpu) +{ + struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu; + + /* Check enablement at VP level */ + return xc->vp_cam & TM_QW1W2_HO; +} + +bool kvmppc_xive_check_save_restore(struct kvm_vcpu *vcpu) +{ + struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu; + struct kvmppc_xive *xive = xc->xive; + + if (xive->flags & KVMPPC_XIVE_FLAG_SAVE_RESTORE) + return kvmppc_xive_vcpu_has_save_restore(vcpu); + + return true; +} + /* * Push a vcpu's context to the XIVE on guest entry. * This assumes we are in virtual mode (MMU on) @@ -77,7 +96,8 @@ void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu) return; eieio(); - __raw_writeq(vcpu->arch.xive_saved_state.w01, tima + TM_QW1_OS); + if (!kvmppc_xive_vcpu_has_save_restore(vcpu)) + __raw_writeq(vcpu->arch.xive_saved_state.w01, tima + TM_QW1_OS); __raw_writel(vcpu->arch.xive_cam_word, tima + TM_QW1_OS + TM_WORD2); vcpu->arch.xive_pushed = 1; eieio(); @@ -149,7 +169,8 @@ void kvmppc_xive_pull_vcpu(struct kvm_vcpu *vcpu) /* First load to pull the context, we ignore the value */ __raw_readl(tima + TM_SPC_PULL_OS_CTX); /* Second load to recover the context state (Words 0 and 1) */ - vcpu->arch.xive_saved_state.w01 = __raw_readq(tima + TM_QW1_OS); + if (!kvmppc_xive_vcpu_has_save_restore(vcpu)) + vcpu->arch.xive_saved_state.w01 = __raw_readq(tima + TM_QW1_OS); /* Fixup some of the state for the next load */ vcpu->arch.xive_saved_state.lsmfb = 0; @@ -1319,6 +1340,12 @@ int kvmppc_xive_connect_vcpu(struct kvm_device *dev, if (r) goto bail; + if (!kvmppc_xive_check_save_restore(vcpu)) { + pr_err("inconsistent save-restore setup for VCPU %d\n", cpu); + r = -EIO; + goto bail; + } + /* Configure VCPU fields for use by assembly push/pull */ vcpu->arch.xive_saved_state.w01 = cpu_to_be64(0xff000000); vcpu->arch.xive_cam_word = cpu_to_be32(xc->vp_cam | TM_QW1W2_VO); @@ -2138,6 +2165,9 @@ static int kvmppc_xive_create(struct kvm_device *dev, u32 type) if (xive_native_has_single_escalation()) xive->flags |= KVMPPC_XIVE_FLAG_SINGLE_ESCALATION; + if (xive_native_has_save_restore()) + xive->flags |= KVMPPC_XIVE_FLAG_SAVE_RESTORE; + kvm->arch.xive = xive; return 0; } diff --git a/arch/powerpc/kvm/book3s_xive.h b/arch/powerpc/kvm/book3s_xive.h index 73c3cd25093c..e6a9651c6f1e 100644 --- a/arch/powerpc/kvm/book3s_xive.h +++ b/arch/powerpc/kvm/book3s_xive.h @@ -98,6 +98,7 @@ struct kvmppc_xive_ops { }; #define KVMPPC_XIVE_FLAG_SINGLE_ESCALATION 0x1 +#define KVMPPC_XIVE_FLAG_SAVE_RESTORE 0x2 struct kvmppc_xive { struct kvm *kvm; @@ -309,6 +310,7 @@ void xive_cleanup_single_escalation(struct kvm_vcpu *vcpu, struct kvmppc_xive_vcpu *xc, int irq); int kvmppc_xive_compute_vp_id(struct kvmppc_xive *xive, u32 cpu, u32 *vp); int kvmppc_xive_set_nr_servers(struct kvmppc_xive *xive, u64 addr); +bool kvmppc_xive_check_save_restore(struct kvm_vcpu *vcpu); static inline bool kvmppc_xive_has_single_escalation(struct kvmppc_xive *xive) { diff --git a/arch/powerpc/kvm/book3s_xive_native.c b/arch/powerpc/kvm/book3s_xive_native.c index 2abb1358a268..af65ea21bde7 100644 --- a/arch/powerpc/kvm/book3s_xive_native.c +++ b/arch/powerpc/kvm/book3s_xive_native.c @@ -168,6 +168,12 @@ int kvmppc_xive_native_connect_vcpu(struct kvm_device *dev, goto bail; } + if (!kvmppc_xive_check_save_restore(vcpu)) { + pr_err("inconsistent save-restore setup for VCPU %d\n", server_num); + rc = -EIO; + goto bail; + } + /* * Enable the VP first as the single escalation mode will * affect escalation interrupts numbering @@ -1114,6 +1120,9 @@ static int kvmppc_xive_native_create(struct kvm_device *dev, u32 type) if (xive_native_has_single_escalation()) xive->flags |= KVMPPC_XIVE_FLAG_SINGLE_ESCALATION; + if (xive_native_has_save_restore()) + xive->flags |= KVMPPC_XIVE_FLAG_SAVE_RESTORE; + xive->ops = &kvmppc_xive_native_ops; kvm->arch.xive = xive; diff --git a/arch/powerpc/sysdev/xive/native.c b/arch/powerpc/sysdev/xive/native.c index 57e3f1540435..1aec282cd650 100644 --- a/arch/powerpc/sysdev/xive/native.c +++ b/arch/powerpc/sysdev/xive/native.c @@ -41,6 +41,7 @@ static u32 xive_queue_shift; static u32 xive_pool_vps = XIVE_INVALID_VP; static struct kmem_cache *xive_provision_cache; static bool xive_has_single_esc; +static bool xive_has_save_restore; int xive_native_populate_irq_data(u32 hw_irq, struct xive_irq_data *data) { @@ -588,6 +589,9 @@ bool __init xive_native_init(void) if (of_get_property(np, "single-escalation-support", NULL) != NULL) xive_has_single_esc = true; + if (of_get_property(np, "vp-save-restore", NULL)) + xive_has_save_restore = true; + /* Configure Thread Management areas for KVM */ for_each_possible_cpu(cpu) kvmppc_set_xive_tima(cpu, r.start, tima); @@ -752,6 +756,12 @@ bool xive_native_has_single_escalation(void) } EXPORT_SYMBOL_GPL(xive_native_has_single_escalation); +bool xive_native_has_save_restore(void) +{ + return xive_has_save_restore; +} +EXPORT_SYMBOL_GPL(xive_native_has_save_restore); + int xive_native_get_queue_info(u32 vp_id, u32 prio, u64 *out_qpage, u64 *out_qsize,