[{"id":3678512,"web_url":"http://patchwork.ozlabs.org/comment/3678512/","msgid":"","list_archive_url":null,"date":"2026-04-17T06:33:42","subject":"Re: [PATCH v3 08/17] hw/usb/hcd-ehci: Reject CTRLDSSEGMENT writes\n without 64-bit capability","submitter":{"id":85046,"url":"http://patchwork.ozlabs.org/api/people/85046/","name":"Philippe Mathieu-Daudé","email":"philmd@linaro.org"},"content":"On 16/4/26 03:49, Jamin Lin wrote:\n> The EHCI CTRLDSSEGMENT register provides the upper 32 bits [63:32] used to\n> form 64-bit addresses for EHCI control data structures. Per EHCI 1.0\n> spec section 2.3.5, when the HCCPARAMS 64-bit Addressing Capability bit\n> is zero, CTRLDSSEGMENT is not used: software cannot write it and reads\n> must return zero.\n> \n> Add a capability check in the operational register write handler and\n> reject guest writes to CTRLDSSEGMENT when 64-bit addressing is\n> not enabled.\n> \n> Signed-off-by: Jamin Lin \n> ---\n> hw/usb/hcd-ehci.c | 9 ++++++++-\n> 1 file changed, 8 insertions(+), 1 deletion(-)\n> \n> diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c\n> index 6409457186..b9e4251d62 100644\n> --- a/hw/usb/hcd-ehci.c\n> +++ b/hw/usb/hcd-ehci.c\n> @@ -1108,7 +1108,14 @@ static void ehci_opreg_write(void *ptr, hwaddr addr,\n> \" is enabled and HC is enabled\\n\");\n> }\n> break;\n> -\n> + case CTRLDSSEGMENT:\n> + if (!s->caps_64bit_addr) {\n> + qemu_log_mask(LOG_GUEST_ERROR,\n> + \"ehci: write to CTRLDSSEGMENT while \"\n> + \" 64-bit addressing capability is disabled\\n\");\n> + return;\n> + }\n> + break;\n\nI'd squash with previous.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=CY/WE4Uk;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","Received-SPF":"pass client-ip=2a00:1450:4864:20::32d;\n envelope-from=philmd@linaro.org; helo=mail-wm1-x32d.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3678550,"web_url":"http://patchwork.ozlabs.org/comment/3678550/","msgid":"","list_archive_url":null,"date":"2026-04-17T08:07:39","subject":"RE: [PATCH v3 08/17] hw/usb/hcd-ehci: Reject CTRLDSSEGMENT writes\n without 64-bit capability","submitter":{"id":81768,"url":"http://patchwork.ozlabs.org/api/people/81768/","name":"Jamin Lin","email":"jamin_lin@aspeedtech.com"},"content":"Hi Philippe,\n\n> Subject: Re: [PATCH v3 08/17] hw/usb/hcd-ehci: Reject CTRLDSSEGMENT\n> writes without 64-bit capability\n> \n> On 16/4/26 03:49, Jamin Lin wrote:\n> > The EHCI CTRLDSSEGMENT register provides the upper 32 bits [63:32]\n> > used to form 64-bit addresses for EHCI control data structures. Per\n> > EHCI 1.0 spec section 2.3.5, when the HCCPARAMS 64-bit Addressing\n> > Capability bit is zero, CTRLDSSEGMENT is not used: software cannot\n> > write it and reads must return zero.\n> >\n> > Add a capability check in the operational register write handler and\n> > reject guest writes to CTRLDSSEGMENT when 64-bit addressing is not\n> > enabled.\n> >\n> > Signed-off-by: Jamin Lin \n> > ---\n> > hw/usb/hcd-ehci.c | 9 ++++++++-\n> > 1 file changed, 8 insertions(+), 1 deletion(-)\n> >\n> > diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c index\n> > 6409457186..b9e4251d62 100644\n> > --- a/hw/usb/hcd-ehci.c\n> > +++ b/hw/usb/hcd-ehci.c\n> > @@ -1108,7 +1108,14 @@ static void ehci_opreg_write(void *ptr, hwaddr\n> addr,\n> > \" is enabled and HC is enabled\\n\");\n> > }\n> > break;\n> > -\n> > + case CTRLDSSEGMENT:\n> > + if (!s->caps_64bit_addr) {\n> > + qemu_log_mask(LOG_GUEST_ERROR,\n> > + \"ehci: write to CTRLDSSEGMENT while \"\n> > + \" 64-bit addressing capability is\n> disabled\\n\");\n> > + return;\n> > + }\n> > + break;\n> \n> I'd squash with previous.\n\nThanks for the review and suggestion.\nWill do.\nJamin","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=aspeedtech.com header.i=@aspeedtech.com\n header.a=rsa-sha256 header.s=selector1 header.b=bqDa3yGa;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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