[PATCH v2] KVM: arm64: Don't acquire RCU read lock for exclusive table walks

[Oliver Upton <oliver.upton@linux.dev>]

Marek reported a BUG resulting from the recent parallel faults changes,
as the hyp stage-1 map walker attempted to allocate table memory while
holding the RCU read lock:

  BUG: sleeping function called from invalid context at
  include/linux/sched/mm.h:274
  in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper/0
  preempt_count: 0, expected: 0
  RCU nest depth: 1, expected: 0
  2 locks held by swapper/0/1:
    #0: ffff80000a8a44d0 (kvm_hyp_pgd_mutex){+.+.}-{3:3}, at:
  __create_hyp_mappings+0x80/0xc4
    #1: ffff80000a927720 (rcu_read_lock){....}-{1:2}, at:
  kvm_pgtable_walk+0x0/0x1f4
  CPU: 2 PID: 1 Comm: swapper/0 Not tainted 6.1.0-rc3+ #5918
  Hardware name: Raspberry Pi 3 Model B (DT)
  Call trace:
    dump_backtrace.part.0+0xe4/0xf0
    show_stack+0x18/0x40
    dump_stack_lvl+0x8c/0xb8
    dump_stack+0x18/0x34
    __might_resched+0x178/0x220
    __might_sleep+0x48/0xa0
    prepare_alloc_pages+0x178/0x1a0
    __alloc_pages+0x9c/0x109c
    alloc_page_interleave+0x1c/0xc4
    alloc_pages+0xec/0x160
    get_zeroed_page+0x1c/0x44
    kvm_hyp_zalloc_page+0x14/0x20
    hyp_map_walker+0xd4/0x134
    kvm_pgtable_visitor_cb.isra.0+0x38/0x5c
    __kvm_pgtable_walk+0x1a4/0x220
    kvm_pgtable_walk+0x104/0x1f4
    kvm_pgtable_hyp_map+0x80/0xc4
    __create_hyp_mappings+0x9c/0xc4
    kvm_mmu_init+0x144/0x1cc
    kvm_arch_init+0xe4/0xef4
    kvm_init+0x3c/0x3d0
    arm_init+0x20/0x30
    do_one_initcall+0x74/0x400
    kernel_init_freeable+0x2e0/0x350
    kernel_init+0x24/0x130
    ret_from_fork+0x10/0x20

Since the hyp stage-1 table walkers are serialized by kvm_hyp_pgd_mutex,
RCU protection really doesn't add anything. Don't acquire the RCU read
lock for an exclusive walk. While at it, add a warning which codifies
the lack of support for shared walks in the hypervisor code.

Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---

Applies on top of the parallel faults series that was picked up last
week. Tested with kvm-arm.mode={nvhe,protected} on an Ampere Altra
system.

v1 -> v2:
 - Took Will's suggestion of conditioning RCU on a flag, small tweak to
   use existing bit instead (Thanks!)

 arch/arm64/include/asm/kvm_pgtable.h | 22 ++++++++++++++++------
 arch/arm64/kvm/hyp/pgtable.c         |  5 +++--
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index a874ce0ce7b5..d4c7321fa652 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -51,8 +51,16 @@ static inline kvm_pte_t *kvm_dereference_pteref(kvm_pteref_t pteref, bool shared
 	return pteref;
 }
 
-static inline void kvm_pgtable_walk_begin(void) {}
-static inline void kvm_pgtable_walk_end(void) {}
+static inline void kvm_pgtable_walk_begin(bool shared)
+{
+	/*
+	 * Due to the lack of RCU (or a similar protection scheme), only
+	 * non-shared table walkers are allowed in the hypervisor.
+	 */
+	WARN_ON(shared);
+}
+
+static inline void kvm_pgtable_walk_end(bool shared) {}
 
 static inline bool kvm_pgtable_walk_lock_held(void)
 {
@@ -68,14 +76,16 @@ static inline kvm_pte_t *kvm_dereference_pteref(kvm_pteref_t pteref, bool shared
 	return rcu_dereference_check(pteref, !shared);
 }
 
-static inline void kvm_pgtable_walk_begin(void)
+static inline void kvm_pgtable_walk_begin(bool shared)
 {
-	rcu_read_lock();
+	if (shared)
+		rcu_read_lock();
 }
 
-static inline void kvm_pgtable_walk_end(void)
+static inline void kvm_pgtable_walk_end(bool shared)
 {
-	rcu_read_unlock();
+	if (shared)
+		rcu_read_unlock();
 }
 
 static inline bool kvm_pgtable_walk_lock_held(void)
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 5bca9610d040..16aed10e7e59 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -287,11 +287,12 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
 		.end	= PAGE_ALIGN(walk_data.addr + size),
 		.walker	= walker,
 	};
+	bool shared = walker->flags & KVM_PGTABLE_WALK_SHARED;
 	int r;
 
-	kvm_pgtable_walk_begin();
+	kvm_pgtable_walk_begin(shared);
 	r = _kvm_pgtable_walk(pgt, &walk_data);
-	kvm_pgtable_walk_end();
+	kvm_pgtable_walk_end(shared);
 
 	return r;
 }
-- 
2.38.1.431.g37b22c650d-goog

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