From: Lan Tianyu <tianyu.lan@intel.com>
To: agraf@suse.com, gleb@kernel.org, pbonzini@redhat.com,
benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au,
guangrong.xiao@linux.intel.com
Cc: Lan Tianyu <tianyu.lan@intel.com>,
kvm-ppc@vger.kernel.org, kvm@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH 7/7] KVM/PPC: update the comment of memory barrier in the kvmppc_prepare_to_enter()
Date: Sun, 13 Mar 2016 11:10:30 +0800 [thread overview]
Message-ID: <1457838631-26775-8-git-send-email-tianyu.lan@intel.com> (raw)
In-Reply-To: <1457838631-26775-1-git-send-email-tianyu.lan@intel.com>
The barrier also orders the write to mode from any reads
to the page tables done and so update the comment.
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
---
arch/powerpc/kvm/powerpc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 19aa59b..6a68730 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -96,6 +96,9 @@ int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
* so we don't miss a request because the requester sees
* OUTSIDE_GUEST_MODE and assumes we'll be checking requests
* before next entering the guest (and thus doesn't IPI).
+ * This also orders the write to mode from any reads
+ * to the page tables done while the VCPU is running.
+ * Please see the comment in kvm_flush_remote_tlbs.
*/
smp_mb();
--
1.8.4.rc0.1.g8f6a3e5.dirty
next prev parent reply other threads:[~2016-03-13 3:27 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-13 3:10 [PATCH 0/7] KVM/X86/PPC: Clear up kvm mmu memory barriers and update related comments Lan Tianyu
2016-03-13 3:10 ` [PATCH 1/7] KVM: Remove redundant smp_mb() in the kvm_mmu_commit_zap_page() Lan Tianyu
2016-03-13 3:10 ` [PATCH 2/7] KVM/x86: Replace smp_mb() with smp_store_mb/release() in the walk_shadow_page_lockless_begin/end() Lan Tianyu
2016-03-13 3:10 ` [PATCH 3/7] KVM: Replace smp_mb() with smp_mb_after_atomic() in the kvm_make_all_cpus_request() Lan Tianyu
2016-03-13 3:10 ` [PATCH 4/7] KVM/x86: Call smp_wmb() before increasing tlbs_dirty Lan Tianyu
2016-03-13 3:10 ` [PATCH 5/7] KVM: Replace smp_mb() with smp_load_acquire() in the kvm_flush_remote_tlbs() Lan Tianyu
2016-03-13 3:10 ` [PATCH 6/7] KVM/x86: update the comment of memory barrier in the vcpu_enter_guest() Lan Tianyu
2016-03-13 3:10 ` Lan Tianyu [this message]
2016-03-14 13:03 ` [PATCH 0/7] KVM/X86/PPC: Clear up kvm mmu memory barriers and update related comments Paolo Bonzini
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