[PATCH v3 3/7] kvm: explicitly set FOLL_HONOR_NUMA_FAULT in hva_to_pfn_slow()

[David Hildenbrand]

KVM is *the* case we know that really wants to honor NUMA hinting falls.
As we want to stop setting FOLL_HONOR_NUMA_FAULT implicitly, set
FOLL_HONOR_NUMA_FAULT whenever we might obtain pages on behalf of a VCPU
to map them into a secondary MMU, and add a comment why.

Do that unconditionally in hva_to_pfn_slow() when calling
get_user_pages_unlocked().

kvmppc_book3s_instantiate_page(), hva_to_pfn_fast() and
gfn_to_page_many_atomic() are similarly used to map pages into a
secondary MMU. However, FOLL_WRITE and get_user_page_fast_only() always
implicitly honor NUMA hinting faults -- as documented for
FOLL_HONOR_NUMA_FAULT -- so we can limit this change to a single location
for now.

Don't set it in check_user_page_hwpoison(), where we really only want to
check if the mapped page is HW-poisoned.

We won't set it for other KVM users of get_user_pages()/pin_user_pages()
* arch/powerpc/kvm/book3s_64_mmu_hv.c: not used to map pages into a
  secondary MMU.
* arch/powerpc/kvm/e500_mmu.c: only used on shared TLB pages with userspace
* arch/s390/kvm/*: s390x only supports a single NUMA node either way
* arch/x86/kvm/svm/sev.c: not used to map pages into a secondary MMU.

This is a preparation for making FOLL_HONOR_NUMA_FAULT no longer
implicitly be set by get_user_pages() and friends.

Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
 virt/kvm/kvm_main.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index dfbaafbe3a00..6e4f2b81541e 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2517,7 +2517,18 @@ static bool hva_to_pfn_fast(unsigned long addr, bool write_fault,
 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
 			   bool interruptible, bool *writable, kvm_pfn_t *pfn)
 {
-	unsigned int flags = FOLL_HWPOISON;
+	/*
+	 * When a VCPU accesses a page that is not mapped into the secondary
+	 * MMU, we lookup the page using GUP to map it, so the guest VCPU can
+	 * make progress. We always want to honor NUMA hinting faults in that
+	 * case, because GUP usage corresponds to memory accesses from the VCPU.
+	 * Otherwise, we'd not trigger NUMA hinting faults once a page is
+	 * mapped into the secondary MMU and gets accessed by a VCPU.
+	 *
+	 * Note that get_user_page_fast_only() and FOLL_WRITE for now
+	 * implicitly honor NUMA hinting faults and don't need this flag.
+	 */
+	unsigned int flags = FOLL_HWPOISON | FOLL_HONOR_NUMA_FAULT;
 	struct page *page;
 	int npages;
 
-- 
2.41.0