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authorLinus Torvalds <torvalds@linux-foundation.org>2018-05-17 20:23:36 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-05-17 20:23:36 +0300
commit58ddfe6c3af91d320cf5d0aba33143e7c1d8dc35 (patch)
tree8647eafcbc9ef5c432e86f0d7aaab2b83e04712c /arch/arm64/include
parent7c9a0fc79f6c5bd7e8e3198c97acf6363da3832f (diff)
parent633711e82878dc29083fc5d2605166755e25b57a (diff)
downloadlinux-58ddfe6c3af91d320cf5d0aba33143e7c1d8dc35.tar.xz
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini: - ARM/ARM64 locking fixes - x86 fixes: PCID, UMIP, locking - improved support for recent Windows version that have a 2048 Hz APIC timer - rename KVM_HINTS_DEDICATED CPUID bit to KVM_HINTS_REALTIME - better behaved selftests * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: kvm: rename KVM_HINTS_DEDICATED to KVM_HINTS_REALTIME KVM: arm/arm64: VGIC/ITS save/restore: protect kvm_read_guest() calls KVM: arm/arm64: VGIC/ITS: protect kvm_read_guest() calls with SRCU lock KVM: arm/arm64: VGIC/ITS: Promote irq_lock() in update_affinity KVM: arm/arm64: Properly protect VGIC locks from IRQs KVM: X86: Lower the default timer frequency limit to 200us KVM: vmx: update sec exec controls for UMIP iff emulating UMIP kvm: x86: Suppress CR3_PCID_INVD bit only when PCIDs are enabled KVM: selftests: exit with 0 status code when tests cannot be run KVM: hyperv: idr_find needs RCU protection x86: Delay skip of emulated hypercall instruction KVM: Extend MAX_IRQ_ROUTES to 4096 for all archs
Diffstat (limited to 'arch/arm64/include')
-rw-r--r--arch/arm64/include/asm/kvm_mmu.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 082110993647..6128992c2ded 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -360,6 +360,22 @@ static inline unsigned int kvm_get_vmid_bits(void)
return (cpuid_feature_extract_unsigned_field(reg, ID_AA64MMFR1_VMIDBITS_SHIFT) == 2) ? 16 : 8;
}
+/*
+ * We are not in the kvm->srcu critical section most of the time, so we take
+ * the SRCU read lock here. Since we copy the data from the user page, we
+ * can immediately drop the lock again.
+ */
+static inline int kvm_read_guest_lock(struct kvm *kvm,
+ gpa_t gpa, void *data, unsigned long len)
+{
+ int srcu_idx = srcu_read_lock(&kvm->srcu);
+ int ret = kvm_read_guest(kvm, gpa, data, len);
+
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+
+ return ret;
+}
+
#ifdef CONFIG_KVM_INDIRECT_VECTORS
/*
* EL2 vectors can be mapped and rerouted in a number of ways,