From 1b6043e8e58468a7c3f2a2469b8834efe8bf5b0a Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Sat, 26 Feb 2022 00:15:39 +0000 Subject: [PATCH] KVM: x86/mmu: Zap roots in two passes to avoid inducing RCU stalls When zapping a TDP MMU root, perform the zap in two passes to avoid zapping an entire top-level SPTE while holding RCU, which can induce RCU stalls. In the first pass, zap SPTEs at PG_LEVEL_1G, and then zap top-level entries in the second pass. With 4-level paging, zapping a PGD that is fully populated with 4kb leaf SPTEs take up to ~7 or so seconds (time varies based on kernel config, number of (v)CPUs, etc...). With 5-level paging, that time can balloon well into hundreds of seconds. Before remote TLB flushes were omitted, the problem was even worse as waiting for all active vCPUs to respond to the IPI introduced significant overhead for VMs with large numbers of vCPUs. By zapping 1gb SPTEs (both shadow pages and hugepages) in the first pass, the amount of work that is done without dropping RCU protection is strictly bounded, with the worst case latency for a single operation being less than 100ms. Zapping at 1gb in the first pass is not arbitrary. First and foremost, KVM relies on being able to zap 1gb shadow pages in a single shot when when repacing a shadow page with a hugepage. Zapping a 1gb shadow page that is fully populated with 4kb dirty SPTEs also triggers the worst case latency due writing back the struct page accessed/dirty bits for each 4kb page, i.e. the two-pass approach is guaranteed to work so long as KVM can cleany zap a 1gb shadow page. rcu: INFO: rcu_sched self-detected stall on CPU rcu: 52-....: (20999 ticks this GP) idle=7be/1/0x4000000000000000 softirq=15759/15759 fqs=5058 (t=21016 jiffies g=66453 q=238577) NMI backtrace for cpu 52 Call Trace: ... mark_page_accessed+0x266/0x2f0 kvm_set_pfn_accessed+0x31/0x40 handle_removed_tdp_mmu_page+0x259/0x2e0 __handle_changed_spte+0x223/0x2c0 handle_removed_tdp_mmu_page+0x1c1/0x2e0 __handle_changed_spte+0x223/0x2c0 handle_removed_tdp_mmu_page+0x1c1/0x2e0 __handle_changed_spte+0x223/0x2c0 zap_gfn_range+0x141/0x3b0 kvm_tdp_mmu_zap_invalidated_roots+0xc8/0x130 kvm_mmu_zap_all_fast+0x121/0x190 kvm_mmu_invalidate_zap_pages_in_memslot+0xe/0x10 kvm_page_track_flush_slot+0x5c/0x80 kvm_arch_flush_shadow_memslot+0xe/0x10 kvm_set_memslot+0x172/0x4e0 __kvm_set_memory_region+0x337/0x590 kvm_vm_ioctl+0x49c/0xf80 Reported-by: David Matlack Cc: Ben Gardon Cc: Mingwei Zhang Signed-off-by: Sean Christopherson Reviewed-by: Ben Gardon Message-Id: <20220226001546.360188-22-seanjc@google.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/mmu/tdp_mmu.c | 51 ++++++++++++++++++++++++++++++---------------- 1 file changed, 34 insertions(+), 17 deletions(-) diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index decf1fb..8e31627 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -822,14 +822,36 @@ static inline gfn_t tdp_mmu_max_gfn_host(void) return 1ULL << (shadow_phys_bits - PAGE_SHIFT); } -static void tdp_mmu_zap_root(struct kvm *kvm, struct kvm_mmu_page *root, - bool shared) +static void __tdp_mmu_zap_root(struct kvm *kvm, struct kvm_mmu_page *root, + bool shared, int zap_level) { struct tdp_iter iter; gfn_t end = tdp_mmu_max_gfn_host(); gfn_t start = 0; + for_each_tdp_pte_min_level(iter, root, zap_level, start, end) { +retry: + if (tdp_mmu_iter_cond_resched(kvm, &iter, false, shared)) + continue; + + if (!is_shadow_present_pte(iter.old_spte)) + continue; + + if (iter.level > zap_level) + continue; + + if (!shared) + tdp_mmu_set_spte(kvm, &iter, 0); + else if (tdp_mmu_set_spte_atomic(kvm, &iter, 0)) + goto retry; + } +} + +static void tdp_mmu_zap_root(struct kvm *kvm, struct kvm_mmu_page *root, + bool shared) +{ + /* * The root must have an elevated refcount so that it's reachable via * mmu_notifier callbacks, which allows this path to yield and drop @@ -847,22 +869,17 @@ static void tdp_mmu_zap_root(struct kvm *kvm, struct kvm_mmu_page *root, rcu_read_lock(); /* - * No need to try to step down in the iterator when zapping an entire - * root, zapping an upper-level SPTE will recurse on its children. + * To avoid RCU stalls due to recursively removing huge swaths of SPs, + * split the zap into two passes. On the first pass, zap at the 1gb + * level, and then zap top-level SPs on the second pass. "1gb" is not + * arbitrary, as KVM must be able to zap a 1gb shadow page without + * inducing a stall to allow in-place replacement with a 1gb hugepage. + * + * Because zapping a SP recurses on its children, stepping down to + * PG_LEVEL_4K in the iterator itself is unnecessary. */ - for_each_tdp_pte_min_level(iter, root, root->role.level, start, end) { -retry: - if (tdp_mmu_iter_cond_resched(kvm, &iter, false, shared)) - continue; - - if (!is_shadow_present_pte(iter.old_spte)) - continue; - - if (!shared) - tdp_mmu_set_spte(kvm, &iter, 0); - else if (tdp_mmu_set_spte_atomic(kvm, &iter, 0)) - goto retry; - } + __tdp_mmu_zap_root(kvm, root, shared, PG_LEVEL_1G); + __tdp_mmu_zap_root(kvm, root, shared, root->role.level); rcu_read_unlock(); } -- 2.7.4