Hi Keqian, On 3/15/21 6:33 PM, Keqian Zhu wrote:
FYI, this has been fixed by Marc in commit 262b003d059c.
Yeah, I didn't check 5.12.rc3 code where the issue has been fixed. So please ignore this one and sorry for the noise. Thanks, Gavin
On 2021/3/15 12:18, Gavin Shan wrote:The last (IPA) page can't be specified when a new memory slot is added. The error -EFAULT is returned when the memory slot is added with the following parameters for the VM, which has 40-bits IPA limit. The host has 4KB base page size. It's not correct because the last (IPA) page is still usable. struct kvm_userspace_memory_region { __u32 slot; /* 1 */ __u32 flags; /* 0 */ __u64 guest_phys_addr; /* 0xfffffff000 */ __u64 memory_size; /* 0x1000 */ __u64 userspace_addr; }; Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx> --- arch/arm64/kvm/mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 286b603ed0d3..a5a8ade9fde4 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1313,7 +1313,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, * Prevent userspace from creating a memory region outside of the IPA * space addressable by the KVM guest IPA space. */ - if (memslot->base_gfn + memslot->npages >= + if (memslot->base_gfn + memslot->npages > (kvm_phys_size(kvm) >> PAGE_SHIFT)) return -EFAULT;
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