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From: Paolo Bonzini <pbonzini@redhat.com>
To: Maxim Levitsky <mlevitsk@redhat.com>, kvm@vger.kernel.org
Cc: Wanpeng Li <wanpengli@tencent.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Joerg Roedel <joro@8bytes.org>,
	Sean Christopherson <seanjc@google.com>,
	linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Jim Mattson <jmattson@google.com>,
	x86@kernel.org, Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] KVM: x86: fix a typo in __try_cmpxchg_user that caused cmpxchg to be not atomic
Date: Thu, 12 May 2022 17:47:35 +0200	[thread overview]
Message-ID: <87e16c11-d57b-92cd-c10b-21d855f475ef@redhat.com> (raw)
In-Reply-To: <20220512101420.306759-1-mlevitsk@redhat.com>

On 5/12/22 12:14, Maxim Levitsky wrote:
> Yes, this is the root cause of the TDP mmu leak I was doing debug of in the last week.
> Non working cmpxchg on which TDP mmu relies makes it install two differnt shadow pages
> under same spte.

Awesome!  And queued, thanks.

Paolo

  parent reply	other threads:[~2022-05-12 15:47 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-02  0:49 [PATCH v2 0/5] x86: uaccess CMPXCHG + KVM bug fixes Sean Christopherson
2022-02-02  0:49 ` [PATCH v2 1/5] Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug Sean Christopherson
2022-02-02  0:49 ` [PATCH v2 2/5] x86/uaccess: Implement macros for CMPXCHG on user addresses Sean Christopherson
2022-02-02  0:49 ` [PATCH v2 3/5] KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits Sean Christopherson
2022-02-02  0:49 ` [PATCH v2 4/5] KVM: x86: Use __try_cmpxchg_user() to emulate atomic accesses Sean Christopherson
2022-05-12 10:14   ` [PATCH] KVM: x86: fix a typo in __try_cmpxchg_user that caused cmpxchg to be not atomic Maxim Levitsky
2022-05-12 12:45     ` Vitaly Kuznetsov
2022-05-12 13:48       ` Sean Christopherson
2022-05-12 15:47     ` Paolo Bonzini [this message]
2022-05-12 21:27       ` Sean Christopherson
2022-05-16 13:14         ` Maxim Levitsky
2022-05-16 14:03           ` Sean Christopherson
2022-02-02  0:49 ` [PATCH v2 5/5] KVM: x86: Bail to userspace if emulation of atomic user access faults Sean Christopherson
2022-04-01  7:53 ` [PATCH v2 0/5] x86: uaccess CMPXCHG + KVM bug fixes Paolo Bonzini
2022-04-01 17:07   ` Tadeusz Struk

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