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KVM: arm/arm64: Re-check VMA on detecting a poisoned page 

When we check for a poisoned page, we use the VMA to tell userspace
about the looming disaster. But we pass a pointer to this VMA
after having released the mmap_sem, which isn't a good idea.

Instead, stash the shift value that goes with this pfn while
we are holding the mmap_sem.

Reported-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
Link: https://lore.kernel.org/r/20191211165651.7889-3-maz@kernel.org
Link: https://lore.kernel.org/r/20191217123809.197392-1-james.morse@arm.com
alistair/sensors
James Morse 2019-12-17 12:38:09 +00:00 committed by Marc Zyngier
parent de9375634b
commit 1559b7583f
1 changed files with 9 additions and 11 deletions
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20
virt/kvm/arm/mmu.c
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@ -1596,16 +1596,8 @@ static void invalidate_icache_guest_page(kvm_pfn_t pfn, unsigned long size)
__invalidate_icache_guest_page(pfn, size);
}
static void kvm_send_hwpoison_signal(unsigned long address,
struct vm_area_struct *vma)
static void kvm_send_hwpoison_signal(unsigned long address, short lsb)
{
short lsb;
if (is_vm_hugetlb_page(vma))
lsb = huge_page_shift(hstate_vma(vma));
else
lsb = PAGE_SHIFT;
send_sig_mceerr(BUS_MCEERR_AR, (void __user *)address, lsb, current);
}
@ -1678,6 +1670,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
struct kvm *kvm = vcpu->kvm;
struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
struct vm_area_struct *vma;
short vma_shift;
kvm_pfn_t pfn;
pgprot_t mem_type = PAGE_S2;
bool logging_active = memslot_is_logging(memslot);
@ -1701,7 +1694,12 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
return -EFAULT;
}
vma_pagesize = vma_kernel_pagesize(vma);
if (is_vm_hugetlb_page(vma))
vma_shift = huge_page_shift(hstate_vma(vma));
else
vma_shift = PAGE_SHIFT;
vma_pagesize = 1ULL << vma_shift;
if (logging_active ||
(vma->vm_flags & VM_PFNMAP) ||
!fault_supports_stage2_huge_mapping(memslot, hva, vma_pagesize)) {
@ -1741,7 +1739,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
pfn = gfn_to_pfn_prot(kvm, gfn, write_fault, &writable);
if (pfn == KVM_PFN_ERR_HWPOISON) {
kvm_send_hwpoison_signal(hva, vma);
kvm_send_hwpoison_signal(hva, vma_shift);
return 0;
}
if (is_error_noslot_pfn(pfn))