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authorRadim Krčmář <rkrcmar@redhat.com>2017-04-05 16:27:47 +0200
committerRadim Krčmář <rkrcmar@redhat.com>2017-04-05 16:27:47 +0200
commit6fd6410311d618d80748b0a5dd3e8d6cd17662bc (patch)
tree5bc09692135e712549f8184f35bc5501b3bd2f7f /arch
parent1fb883bb827ee8efc1cc9ea0154f953f8a219d38 (diff)
parent6d56111c92d247bb64301029fe88365aa4caf16e (diff)
downloadlinux-6fd6410311d618d80748b0a5dd3e8d6cd17662bc.tar.bz2
Merge tag 'kvm-arm-for-v4.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm
From: Christoffer Dall <cdall@linaro.org> KVM/ARM Fixes for v4.11-rc6 Fixes include: - Fix a problem with GICv3 userspace save/restore - Clarify GICv2 userspace save/restore ABI - Be more careful in clearing GIC LRs - Add missing synchronization primitive to our MMU handling code
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kvm/arm.c3
-rw-r--r--arch/arm/kvm/mmu.c23
2 files changed, 23 insertions, 3 deletions
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 96dba7cd8be7..314eb6abe1ff 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -1124,6 +1124,9 @@ static void cpu_hyp_reinit(void)
if (__hyp_get_vectors() == hyp_default_vectors)
cpu_init_hyp_mode(NULL);
}
+
+ if (vgic_present)
+ kvm_vgic_init_cpu_hardware();
}
static void cpu_hyp_reset(void)
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 962616fd4ddd..582a972371cf 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -292,11 +292,18 @@ static void unmap_stage2_range(struct kvm *kvm, phys_addr_t start, u64 size)
phys_addr_t addr = start, end = start + size;
phys_addr_t next;
+ assert_spin_locked(&kvm->mmu_lock);
pgd = kvm->arch.pgd + stage2_pgd_index(addr);
do {
next = stage2_pgd_addr_end(addr, end);
if (!stage2_pgd_none(*pgd))
unmap_stage2_puds(kvm, pgd, addr, next);
+ /*
+ * If the range is too large, release the kvm->mmu_lock
+ * to prevent starvation and lockup detector warnings.
+ */
+ if (next != end)
+ cond_resched_lock(&kvm->mmu_lock);
} while (pgd++, addr = next, addr != end);
}
@@ -803,6 +810,7 @@ void stage2_unmap_vm(struct kvm *kvm)
int idx;
idx = srcu_read_lock(&kvm->srcu);
+ down_read(&current->mm->mmap_sem);
spin_lock(&kvm->mmu_lock);
slots = kvm_memslots(kvm);
@@ -810,6 +818,7 @@ void stage2_unmap_vm(struct kvm *kvm)
stage2_unmap_memslot(kvm, memslot);
spin_unlock(&kvm->mmu_lock);
+ up_read(&current->mm->mmap_sem);
srcu_read_unlock(&kvm->srcu, idx);
}
@@ -829,7 +838,10 @@ void kvm_free_stage2_pgd(struct kvm *kvm)
if (kvm->arch.pgd == NULL)
return;
+ spin_lock(&kvm->mmu_lock);
unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE);
+ spin_unlock(&kvm->mmu_lock);
+
/* Free the HW pgd, one page at a time */
free_pages_exact(kvm->arch.pgd, S2_PGD_SIZE);
kvm->arch.pgd = NULL;
@@ -1801,6 +1813,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
(KVM_PHYS_SIZE >> PAGE_SHIFT))
return -EFAULT;
+ down_read(&current->mm->mmap_sem);
/*
* A memory region could potentially cover multiple VMAs, and any holes
* between them, so iterate over all of them to find out if we can map
@@ -1844,8 +1857,10 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
pa += vm_start - vma->vm_start;
/* IO region dirty page logging not allowed */
- if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES)
- return -EINVAL;
+ if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES) {
+ ret = -EINVAL;
+ goto out;
+ }
ret = kvm_phys_addr_ioremap(kvm, gpa, pa,
vm_end - vm_start,
@@ -1857,7 +1872,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
} while (hva < reg_end);
if (change == KVM_MR_FLAGS_ONLY)
- return ret;
+ goto out;
spin_lock(&kvm->mmu_lock);
if (ret)
@@ -1865,6 +1880,8 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
else
stage2_flush_memslot(kvm, memslot);
spin_unlock(&kvm->mmu_lock);
+out:
+ up_read(&current->mm->mmap_sem);
return ret;
}