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RISC-V: KVM: Propagate interrupted G-stage faults

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__kvm_faultin_pfn() reports an interrupted host page fault with
KVM_PFN_ERR_SIGPENDING. RISC-V currently handles it as a generic
error PFN and returns -EFAULT.

Return -EINTR for the signal-pending sentinel so callers can distinguish
an interrupted fault from an invalid userspace mapping. Do not log the
expected interruption as a vCPU exit error.

Fixes: 9d05c1fee8 ("RISC-V: KVM: Implement stage2 page table programming")
Cc: stable@vger.kernel.org
Signed-off-by: Xie Bo <xb@ultrarisc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260810051544.3953925-3-xb@ultrarisc.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Xie Bo 2026-08-10 13:15:44 +08:00 committed by Anup Patel
parent ed54fdb460
commit f41fb17143
2 changed files with 3 additions and 1 deletions
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2
arch/riscv/kvm/mmu.c
View File

@ -708,6 +708,8 @@ int kvm_riscv_mmu_map(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot,
vma_pageshift, current);
return 0;
}
if (is_sigpending_pfn(hfn))
return -EINTR;
if (is_error_noslot_pfn(hfn))
return -EFAULT;

2
arch/riscv/kvm/vcpu_exit.c
View File

@ -283,7 +283,7 @@ int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
}
/* Print details in-case of error */
if (ret < 0) {
if (ret < 0 && ret != -EINTR) {
kvm_err("VCPU exit error %d\n", ret);
kvm_err("SEPC=0x%lx SSTATUS=0x%lx HSTATUS=0x%lx\n",
vcpu->arch.guest_context.sepc,