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| author | Paolo Bonzini <pbonzini@redhat.com> | 2020-06-23 05:12:24 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-07-08 16:21:42 -0400 |
| commit | a8d908b5873cad212b0f74569f5a23b804e694ce (patch) | |
| tree | 6cfe52868ea5b2408e5a6e8b6c386828c4d1e33c /arch/x86/kvm/svm | |
| parent | dc42c8ae0a7762378102dd043779d19331804cce (diff) | |
| download | lwn-a8d908b5873cad212b0f74569f5a23b804e694ce.tar.gz lwn-a8d908b5873cad212b0f74569f5a23b804e694ce.zip | |
KVM: x86: report sev_pin_memory errors with PTR_ERR
Callers of sev_pin_memory() treat
NULL differently:
sev_launch_secret()/svm_register_enc_region() return -ENOMEM
sev_dbg_crypt() returns -EFAULT.
Switching to ERR_PTR() preserves the error and enables cleaner reporting of
different kinds of failures.
Suggested-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm')
| -rw-r--r-- | arch/x86/kvm/svm/sev.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index a893624b9275..2b4916ffa906 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -320,7 +320,7 @@ static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr, unsigned long first, last; if (ulen == 0 || uaddr + ulen < uaddr) - return NULL; + return ERR_PTR(-EINVAL); /* Calculate number of pages. */ first = (uaddr & PAGE_MASK) >> PAGE_SHIFT; @@ -331,11 +331,11 @@ static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr, lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; if (locked > lock_limit && !capable(CAP_IPC_LOCK)) { pr_err("SEV: %lu locked pages exceed the lock limit of %lu.\n", locked, lock_limit); - return NULL; + return ERR_PTR(-ENOMEM); } if (WARN_ON_ONCE(npages > INT_MAX)) - return NULL; + return ERR_PTR(-EINVAL); /* Avoid using vmalloc for smaller buffers. */ size = npages * sizeof(struct page *); @@ -345,7 +345,7 @@ static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr, pages = kmalloc(size, GFP_KERNEL_ACCOUNT); if (!pages) - return NULL; + return ERR_PTR(-ENOMEM); /* Pin the user virtual address. */ npinned = pin_user_pages_fast(uaddr, npages, write ? FOLL_WRITE : 0, pages); @@ -360,11 +360,13 @@ static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr, return pages; err: - if (npinned > 0) + if (npinned > 0) { unpin_user_pages(pages, npinned); + npinned = -ENOMEM; + } kvfree(pages); - return NULL; + return ERR_PTR(npinned); } static void sev_unpin_memory(struct kvm *kvm, struct page **pages, @@ -864,8 +866,8 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp) return -EFAULT; pages = sev_pin_memory(kvm, params.guest_uaddr, params.guest_len, &n, 1); - if (!pages) - return -ENOMEM; + if (IS_ERR(pages)) + return PTR_ERR(pages); /* * The secret must be copied into contiguous memory region, lets verify @@ -991,8 +993,8 @@ int svm_register_enc_region(struct kvm *kvm, return -ENOMEM; region->pages = sev_pin_memory(kvm, range->addr, range->size, ®ion->npages, 1); - if (!region->pages) { - ret = -ENOMEM; + if (IS_ERR(region->pages)) { + ret = PTR_ERR(region->pages); goto e_free; } |