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| author | Peter Xu <peterx@redhat.com> | 2024-08-26 16:43:44 -0400 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-09-17 01:06:59 -0700 |
| commit | 5731aacd54a883dd2c1a5e8c85e1fe78fc728dc7 (patch) | |
| tree | 89160f652ce978d855193adff5fca8248f93131a /virt | |
| parent | 6da8e9634bb7e3fdad9ae0e4db873a05036c4343 (diff) | |
| download | lwn-5731aacd54a883dd2c1a5e8c85e1fe78fc728dc7.tar.gz lwn-5731aacd54a883dd2c1a5e8c85e1fe78fc728dc7.zip | |
KVM: use follow_pfnmap API
Use the new pfnmap API to allow huge MMIO mappings for VMs. The rest work
is done perfectly on the other side (host_pfn_mapping_level()).
Link: https://lkml.kernel.org/r/20240826204353.2228736-11-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Gavin Shan <gshan@redhat.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Niklas Schnelle <schnelle@linux.ibm.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index cb2b78e92910..f416d5e3f9c0 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2860,13 +2860,11 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma, unsigned long addr, bool write_fault, bool *writable, kvm_pfn_t *p_pfn) { + struct follow_pfnmap_args args = { .vma = vma, .address = addr }; kvm_pfn_t pfn; - pte_t *ptep; - pte_t pte; - spinlock_t *ptl; int r; - r = follow_pte(vma, addr, &ptep, &ptl); + r = follow_pfnmap_start(&args); if (r) { /* * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does @@ -2881,21 +2879,19 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma, if (r) return r; - r = follow_pte(vma, addr, &ptep, &ptl); + r = follow_pfnmap_start(&args); if (r) return r; } - pte = ptep_get(ptep); - - if (write_fault && !pte_write(pte)) { + if (write_fault && !args.writable) { pfn = KVM_PFN_ERR_RO_FAULT; goto out; } if (writable) - *writable = pte_write(pte); - pfn = pte_pfn(pte); + *writable = args.writable; + pfn = args.pfn; /* * Get a reference here because callers of *hva_to_pfn* and @@ -2916,9 +2912,8 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma, */ if (!kvm_try_get_pfn(pfn)) r = -EFAULT; - out: - pte_unmap_unlock(ptep, ptl); + follow_pfnmap_end(&args); *p_pfn = pfn; return r; |