KVM: PPC: Book3S HV: Fix IRQ map warnings with XICS on pSeries KVM Guest

The commit 9576730d0e6e ("KVM: PPC: select IRQ_BYPASS_MANAGER") enabled
IRQ_BYPASS_MANAGER when CONFIG_KVM was set. Subsequently, commit
c57875f5f9be ("KVM: PPC: Book3S HV: Enable IRQ bypass") enabled IRQ
bypass and added the necessary callbacks to create/remove the mappings
between host real IRQ and the guest GSI.

The availability of IRQ bypass is determined by the arch-specific
function kvm_arch_has_irq_bypass(), which invokes
kvmppc_irq_bypass_add_producer_hv(). This function, in turn, calls
kvmppc_set_passthru_irq_hv() to create a mapping in the passthrough IRQ
map, associating a host IRQ to a guest GSI.

However, when a pSeries KVM guest (L2) is booted within an LPAR (L1)
with the kernel boot parameter `xive=off`, it defaults to using emulated
XICS controller. As an attempt to establish host IRQ to guest GSI
mappings via kvmppc_set_passthru_irq() on a PCI device hotplug
(passhthrough) operation fail, returning -ENOENT. This failure occurs
because only interrupts with EOI operations handled through OPAL calls
(verified via is_pnv_opal_msi()) are currently supported.

These mapping failures lead to below repeated warnings in the L1 host:

 [  509.220349] kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (58,4970)
 [  509.220368] kvmppc_set_passthru_irq (irq 58, gsi 4970) fails: -2
 [  509.220376] vfio-pci 0015:01:00.0: irq bypass producer (token 0000000090bc635b) registration fails: -2
 ...
 [  509.291781] vfio-pci 0015:01:00.0: irq bypass producer (token 000000003822eed8) registration fails: -2

Fix this by restricting IRQ bypass enablement on pSeries systems by
making the IRQ bypass callbacks unavailable when running on pSeries
platform.

Signed-off-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Tested-by: Gautam Menghani <gautam@linux.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250425185641.1611857-1-amachhiw@linux.ibm.com

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 19f4d298dd17491f50cf128c977151eb2b37f18f..7667563fb9ffbe5b2b41266f0277689b95fcf575 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -6541,10 +6541,6 @@ static struct kvmppc_ops kvm_ops_hv = {
        .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
        .arch_vm_ioctl  = kvm_arch_vm_ioctl_hv,
        .hcall_implemented = kvmppc_hcall_impl_hv,
-#ifdef CONFIG_KVM_XICS
-       .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv,
-       .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv,
-#endif
        .configure_mmu = kvmhv_configure_mmu,
        .get_rmmu_info = kvmhv_get_rmmu_info,
        .set_smt_mode = kvmhv_set_smt_mode,
@@ -6662,6 +6658,22 @@ static int kvmppc_book3s_init_hv(void)
                return r;
        }
 
+#if defined(CONFIG_KVM_XICS)
+       /*
+        * IRQ bypass is supported only for interrupts whose EOI operations are
+        * handled via OPAL calls. Therefore, register IRQ bypass handlers
+        * exclusively for PowerNV KVM when booted with 'xive=off', indicating
+        * the use of the emulated XICS interrupt controller.
+        */
+       if (!kvmhv_on_pseries()) {
+               pr_info("KVM-HV: Enabling IRQ bypass\n");
+               kvm_ops_hv.irq_bypass_add_producer =
+                       kvmppc_irq_bypass_add_producer_hv;
+               kvm_ops_hv.irq_bypass_del_producer =
+                       kvmppc_irq_bypass_del_producer_hv;
+       }
+#endif
+
        kvm_ops_hv.owner = THIS_MODULE;
        kvmppc_hv_ops = &kvm_ops_hv;