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| author | Sean Christopherson <seanjc@google.com> | 2026-03-13 03:33:01 +0300 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2026-04-03 19:37:25 +0300 |
| commit | 7ad02ff1e4a4d1a06483ec839cff26ea232db70f (patch) | |
| tree | 622ab77b1334b24cdb78f54046418e4bbc7079a7 | |
| parent | 6d71f9349d9bf09bf82309bdc46704b4b6f6b314 (diff) | |
| download | linux-7ad02ff1e4a4d1a06483ec839cff26ea232db70f.tar.xz | |
KVM: SEV: Use PFN_DOWN() to simplify "number of pages" math when pinning memory
Use PFN_DOWN() instead of open coded equivalents in sev_pin_memory() to
simplify the code and make it easier to read.
No functional change intended (verified before and after versions of the
generated code are identical).
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Tested-by: Liam Merwick <liam.merwick@oracle.com>
Link: https://patch.msgid.link/20260313003302.3136111-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
| -rw-r--r-- | arch/x86/kvm/svm/sev.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index f37e23496b64..15ac2b907260 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -682,7 +682,6 @@ static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr, int npinned; unsigned long total_npages, lock_limit; struct page **pages; - unsigned long first, last; int ret; lockdep_assert_held(&kvm->lock); @@ -692,12 +691,10 @@ static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr, /* * Calculate the number of pages that need to be pinned to cover the - * entire range. Note! This isn't simply ulen >> PAGE_SHIFT, as KVM + * entire range. Note! This isn't simply PFN_DOWN(ulen), as KVM * doesn't require the incoming address+size to be page aligned! */ - first = (uaddr & PAGE_MASK) >> PAGE_SHIFT; - last = ((uaddr + ulen - 1) & PAGE_MASK) >> PAGE_SHIFT; - npages = (last - first + 1); + npages = PFN_DOWN(uaddr + ulen - 1) - PFN_DOWN(uaddr) + 1; if (npages > INT_MAX) return ERR_PTR(-EINVAL); |