From af1bae5497b98cb99d6b0492e6981f060420a00c Mon Sep 17 00:00:00 2001 From: =?utf8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Date: Tue, 12 Jul 2016 22:09:30 +0200 Subject: [PATCH] KVM: x86: bump KVM_MAX_VCPU_ID to 1023 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit kzalloc was replaced with kvm_kvzalloc to allow non-contiguous areas and rcu had to be modified to cope with it. The practical limit for KVM_MAX_VCPU_ID right now is INT_MAX, but lower value was chosen in case there were bugs. 1023 is sufficient maximum APIC ID for 288 VCPUs. Signed-off-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/lapic.c | 13 ++++++++++--- arch/x86/kvm/x86.c | 2 +- 3 files changed, 12 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 21a40dc7aad6..9fcb197aa5ce 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -36,6 +36,7 @@ #define KVM_MAX_VCPUS 288 #define KVM_SOFT_MAX_VCPUS 240 +#define KVM_MAX_VCPU_ID 1023 #define KVM_USER_MEM_SLOTS 509 /* memory slots that are not exposed to userspace */ #define KVM_PRIVATE_MEM_SLOTS 3 diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index a16e0bb95d28..6895fd28aae9 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -147,6 +147,13 @@ static inline bool kvm_apic_map_get_logical_dest(struct kvm_apic_map *map, } } +static void kvm_apic_map_free(struct rcu_head *rcu) +{ + struct kvm_apic_map *map = container_of(rcu, struct kvm_apic_map, rcu); + + kvfree(map); +} + static void recalculate_apic_map(struct kvm *kvm) { struct kvm_apic_map *new, *old = NULL; @@ -160,8 +167,8 @@ static void recalculate_apic_map(struct kvm *kvm) if (kvm_apic_present(vcpu)) max_id = max(max_id, kvm_apic_id(vcpu->arch.apic)); - new = kzalloc(sizeof(struct kvm_apic_map) + - sizeof(struct kvm_lapic *) * (max_id + 1), GFP_KERNEL); + new = kvm_kvzalloc(sizeof(struct kvm_apic_map) + + sizeof(struct kvm_lapic *) * ((u64)max_id + 1)); if (!new) goto out; @@ -206,7 +213,7 @@ out: mutex_unlock(&kvm->arch.apic_map_lock); if (old) - kfree_rcu(old, rcu); + call_rcu(&old->rcu, kvm_apic_map_free); kvm_make_scan_ioapic_request(kvm); } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index f0d23622bc4e..a27b33033700 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7927,7 +7927,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm) kfree(kvm->arch.vpic); kfree(kvm->arch.vioapic); kvm_free_vcpus(kvm); - kfree(rcu_dereference_check(kvm->arch.apic_map, 1)); + kvfree(rcu_dereference_check(kvm->arch.apic_map, 1)); kvm_mmu_uninit_vm(kvm); } -- 2.20.1