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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-11-15 09:05:39 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-11-15 09:05:39 -0800 |
| commit | 74bc8acd6cb4f5cee25fcfe4e9afb06f75949081 (patch) | |
| tree | 8bc5ffb73324a4758fb5a8c985abfdd17d75b63a /arch | |
| parent | 5b675f7362ba9debfd6c3e38edda197b35a29f0f (diff) | |
| parent | 9cb09e7c1c9af2968d5186ef9085f05641ab65d9 (diff) | |
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull more KVM fixes from Paolo Bonzini:
- fixes for CONFIG_KVM_COMPAT=n
- two updates to the IFU erratum
- selftests build fix
- brown paper bag fix
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: Add a comment describing the /dev/kvm no_compat handling
KVM: x86/mmu: Take slots_lock when using kvm_mmu_zap_all_fast()
KVM: Forbid /dev/kvm being opened by a compat task when CONFIG_KVM_COMPAT=n
KVM: X86: Reset the three MSR list number variables to 0 in kvm_init_msr_list()
selftests: kvm: fix build with glibc >= 2.30
kvm: x86: disable shattered huge page recovery for PREEMPT_RT.
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 10 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 4 |
2 files changed, 11 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index fd6012eef9c9..2ce9da58611e 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -51,7 +51,12 @@ extern bool itlb_multihit_kvm_mitigation; static int __read_mostly nx_huge_pages = -1; +#ifdef CONFIG_PREEMPT_RT +/* Recovery can cause latency spikes, disable it for PREEMPT_RT. */ +static uint __read_mostly nx_huge_pages_recovery_ratio = 0; +#else static uint __read_mostly nx_huge_pages_recovery_ratio = 60; +#endif static int set_nx_huge_pages(const char *val, const struct kernel_param *kp); static int set_nx_huge_pages_recovery_ratio(const char *val, const struct kernel_param *kp); @@ -6280,14 +6285,13 @@ static int set_nx_huge_pages(const char *val, const struct kernel_param *kp) if (new_val != old_val) { struct kvm *kvm; - int idx; mutex_lock(&kvm_lock); list_for_each_entry(kvm, &vm_list, vm_list) { - idx = srcu_read_lock(&kvm->srcu); + mutex_lock(&kvm->slots_lock); kvm_mmu_zap_all_fast(kvm); - srcu_read_unlock(&kvm->srcu, idx); + mutex_unlock(&kvm->slots_lock); wake_up_process(kvm->arch.nx_lpage_recovery_thread); } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 7db5c8ef35dd..5d530521f11d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -5130,6 +5130,10 @@ static void kvm_init_msr_list(void) perf_get_x86_pmu_capability(&x86_pmu); + num_msrs_to_save = 0; + num_emulated_msrs = 0; + num_msr_based_features = 0; + for (i = 0; i < ARRAY_SIZE(msrs_to_save_all); i++) { if (rdmsr_safe(msrs_to_save_all[i], &dummy[0], &dummy[1]) < 0) continue; |