From: Ben Gardon <bgardon@google.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>, Peter Xu <peterx@redhat.com>,
Sean Christopherson <seanjc@google.com>,
David Matlack <dmatlack@google.com>,
Jim Mattson <jmattson@google.com>,
David Dunn <daviddunn@google.com>,
Jing Zhang <jingzhangos@google.com>,
Junaid Shahid <junaids@google.com>,
Ben Gardon <bgardon@google.com>
Subject: [PATCH v2 07/11] KVM: x86/MMU: Factor out updating NX hugepages state for a VM
Date: Mon, 21 Mar 2022 16:48:40 -0700 [thread overview]
Message-ID: <20220321234844.1543161-8-bgardon@google.com> (raw)
In-Reply-To: <20220321234844.1543161-1-bgardon@google.com>
Factor out the code to update the NX hugepages state for an individual
VM. This will be expanded in future commits to allow per-VM control of
Nx hugepages.
No functional change intended.
Signed-off-by: Ben Gardon <bgardon@google.com>
---
arch/x86/kvm/mmu/mmu.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 3b8da8b0745e..1b59b56642f1 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6195,6 +6195,15 @@ static void __set_nx_huge_pages(bool val)
nx_huge_pages = itlb_multihit_kvm_mitigation = val;
}
+static int kvm_update_nx_huge_pages(struct kvm *kvm)
+{
+ mutex_lock(&kvm->slots_lock);
+ kvm_mmu_zap_all_fast(kvm);
+ mutex_unlock(&kvm->slots_lock);
+
+ wake_up_process(kvm->arch.nx_lpage_recovery_thread);
+}
+
static int set_nx_huge_pages(const char *val, const struct kernel_param *kp)
{
bool old_val = nx_huge_pages;
@@ -6217,13 +6226,8 @@ static int set_nx_huge_pages(const char *val, const struct kernel_param *kp)
mutex_lock(&kvm_lock);
- list_for_each_entry(kvm, &vm_list, vm_list) {
- mutex_lock(&kvm->slots_lock);
- kvm_mmu_zap_all_fast(kvm);
- mutex_unlock(&kvm->slots_lock);
-
- wake_up_process(kvm->arch.nx_lpage_recovery_thread);
- }
+ list_for_each_entry(kvm, &vm_list, vm_list)
+ kvm_set_nx_huge_pages(kvm);
mutex_unlock(&kvm_lock);
}
--
2.35.1.894.gb6a874cedc-goog
next prev parent reply other threads:[~2022-03-21 23:50 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-21 23:48 [PATCH v2 00/11] KVM: x86: Add a cap to disable NX hugepages on a VM Ben Gardon
2022-03-21 23:48 ` [PATCH v2 01/11] KVM: selftests: Add vm_alloc_page_table_in_memslot library function Ben Gardon
2022-03-21 23:48 ` [PATCH v2 02/11] KVM: selftests: Dump VM stats in binary stats test Ben Gardon
2022-03-21 23:48 ` [PATCH v2 03/11] KVM: selftests: Test reading a single stat Ben Gardon
2022-03-21 23:48 ` [PATCH v2 04/11] KVM: selftests: Add memslot parameter to elf_load Ben Gardon
2022-03-21 23:48 ` [PATCH v2 05/11] KVM: selftests: Improve error message in vm_phy_pages_alloc Ben Gardon
2022-03-21 23:48 ` [PATCH v2 06/11] KVM: selftests: Add NX huge pages test Ben Gardon
2022-03-28 18:57 ` David Matlack
2022-03-28 22:17 ` Ben Gardon
2022-03-21 23:48 ` Ben Gardon [this message]
2022-03-28 20:18 ` [PATCH v2 07/11] KVM: x86/MMU: Factor out updating NX hugepages state for a VM David Matlack
2022-03-28 22:41 ` Ben Gardon
2022-03-21 23:48 ` [PATCH v2 08/11] KVM: x86/MMU: Track NX hugepages on a per-VM basis Ben Gardon
2022-03-28 20:21 ` David Matlack
2022-03-21 23:48 ` [PATCH v2 09/11] KVM: x86/MMU: Allow NX huge pages to be disabled on a per-vm basis Ben Gardon
2022-03-28 20:29 ` David Matlack
2022-03-21 23:48 ` [PATCH v2 10/11] KVM: x86: Fix errant brace in KVM capability handling Ben Gardon
2022-03-21 23:48 ` [PATCH v2 11/11] KVM: x86/MMU: Require reboot permission to disable NX hugepages Ben Gardon
2022-03-28 20:34 ` David Matlack
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