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Sat, 17 Aug 2024 11:25:43 +0100 Date: Sat, 17 Aug 2024 11:25:42 +0100 Message-ID: <86a5hbzbrt.wl-maz@kernel.org> From: Marc Zyngier To: Zenghui Yu Cc: , , , , , , Subject: Re: [PATCH] KVM: arm64: vgic-debug: Don't put unmarked LPIs In-Reply-To: <20240817101541.1664-1-yuzenghui@huawei.com> References: <20240817101541.1664-1-yuzenghui@huawei.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/29.4 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, oliver.upton@linux.dev, james.morse@arm.com, suzuki.poulose@arm.com, wanghaibin.wang@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240817_032549_337300_2CAA2ADC X-CRM114-Status: GOOD ( 20.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, 17 Aug 2024 11:15:41 +0100, Zenghui Yu wrote: > > If there were LPIs being mapped behind our back (i.e., between .start() and > .stop()), we would put them at iter_unmark_lpis() without checking if they > were actually *marked*, which is obviously not good. > > Switch to use the xa_for_each_marked() iterator to fix it. > > Fixes: 85d3ccc8b75b ("KVM: arm64: vgic-debug: Use an xarray mark for debug iterator") > Signed-off-by: Zenghui Yu > --- > arch/arm64/kvm/vgic/vgic-debug.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/kvm/vgic/vgic-debug.c b/arch/arm64/kvm/vgic/vgic-debug.c > index bc74d06398ef..e1397ab2072a 100644 > --- a/arch/arm64/kvm/vgic/vgic-debug.c > +++ b/arch/arm64/kvm/vgic/vgic-debug.c > @@ -85,7 +85,7 @@ static void iter_unmark_lpis(struct kvm *kvm) > struct vgic_irq *irq; > unsigned long intid; > > - xa_for_each(&dist->lpi_xa, intid, irq) { > + xa_for_each_marked(&dist->lpi_xa, intid, irq, LPI_XA_MARK_DEBUG_ITER) { > xa_clear_mark(&dist->lpi_xa, intid, LPI_XA_MARK_DEBUG_ITER); > vgic_put_irq(kvm, irq); > } Ouch. Nicely caught. I think this deserves a Cc: stable@vger.kernel.org # v6.10 With that, Reviewed-by: Marc Zyngier Thanks, M. -- Without deviation from the norm, progress is not possible.