{"id":2227038,"url":"http://patchwork.ozlabs.org/api/patches/2227038/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260423051804.362095-10-jamin_lin@aspeedtech.com/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260423051804.362095-10-jamin_lin@aspeedtech.com>","list_archive_url":null,"date":"2026-04-23T05:18:16","name":"[v4,09/17] hw/usb/hcd-ehci: Add property to advertise 64-bit addressing capability","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"56cf93ac9c0c41c8484476072e9714b8c45e33cb","submitter":{"id":81768,"url":"http://patchwork.ozlabs.org/api/people/81768/?format=json","name":"Jamin Lin","email":"jamin_lin@aspeedtech.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260423051804.362095-10-jamin_lin@aspeedtech.com/mbox/","series":[{"id":501145,"url":"http://patchwork.ozlabs.org/api/series/501145/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=501145","date":"2026-04-23T05:18:08","name":"hw/usb/ehci: Add 64-bit descriptor addressing support","version":4,"mbox":"http://patchwork.ozlabs.org/series/501145/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2227038/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2227038/checks/","tags":{},"related":[],"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=f336Q2vI;\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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This allows software to use the 64-bit\ndata structure formats described in Appendix B.\n\nWhen disabled (default), the controller reports 32-bit addressing\ncapability and uses the standard 32-bit data structures.\n\nThe EHCI CTRLDSSEGMENT register provides the upper 32 bits [63:32] used to\nform 64-bit addresses for EHCI control data structures. Per EHCI 1.0\nspec section 2.3.5, when the HCCPARAMS 64-bit Addressing Capability bit\nis zero, CTRLDSSEGMENT is not used: software cannot write it and reads\nmust return zero.\n\nAdd a capability check in the operational register write handler and\nreject guest writes to CTRLDSSEGMENT when 64-bit addressing is\nnot enabled.\n\nSigned-off-by: Jamin Lin \nReviewed-by: Cédric Le Goater \nReviewed-by: Philippe Mathieu-Daudé \n---\n hw/usb/hcd-ehci.h | 5 ++++-\n hw/usb/hcd-ehci.c | 14 +++++++++++++-\n 2 files changed, 17 insertions(+), 2 deletions(-)","diff":"diff --git a/hw/usb/hcd-ehci.h b/hw/usb/hcd-ehci.h\nindex 3acbddfc5c..f1f2fde578 100644\n--- a/hw/usb/hcd-ehci.h\n+++ b/hw/usb/hcd-ehci.h\n@@ -257,6 +257,7 @@ struct EHCIState {\n /* properties */\n uint32_t maxframes;\n bool migrate_fetch_addr_64bit;\n+ bool caps_64bit_addr;\n \n /*\n * EHCI spec version 1.0 Section 2.3\n@@ -313,7 +314,9 @@ struct EHCIState {\n #define DEFINE_EHCI_COMMON_PROPERTIES(_state) \\\n DEFINE_PROP_UINT32(\"maxframes\", _state, ehci.maxframes, 128), \\\n DEFINE_PROP_BOOL(\"x-migrate-fetch-addr-64bit\", _state, \\\n- ehci.migrate_fetch_addr_64bit, true)\n+ ehci.migrate_fetch_addr_64bit, true), \\\n+ DEFINE_PROP_BOOL(\"caps-64bit-addr\", _state, \\\n+ ehci.caps_64bit_addr, false)\n \n extern const VMStateDescription vmstate_ehci;\n \ndiff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c\nindex 0c8bdb48ad..b23ff92e12 100644\n--- a/hw/usb/hcd-ehci.c\n+++ b/hw/usb/hcd-ehci.c\n@@ -1109,6 +1109,15 @@ static void ehci_opreg_write(void *ptr, hwaddr addr,\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+\n case ASYNCLISTADDR:\n if (ehci_async_enabled(s)) {\n qemu_log_mask(LOG_GUEST_ERROR,\n@@ -2554,6 +2563,9 @@ void usb_ehci_realize(EHCIState *s, DeviceState *dev, Error **errp)\n s->maxframes);\n return;\n }\n+ if (s->caps_64bit_addr) {\n+ s->caps[0x08] |= BIT(0);\n+ }\n \n memory_region_add_subregion(&s->mem, s->capsbase, &s->mem_caps);\n memory_region_add_subregion(&s->mem, s->opregbase, &s->mem_opreg);\n@@ -2613,7 +2625,7 @@ void usb_ehci_init(EHCIState *s, DeviceState *dev)\n s->caps[0x05] = 0x00; /* No companion ports at present */\n s->caps[0x06] = 0x00;\n s->caps[0x07] = 0x00;\n- s->caps[0x08] = 0x80; /* We can cache whole frame, no 64-bit */\n+ s->caps[0x08] = 0x80; /* We can cache whole frame */\n s->caps[0x0a] = 0x00;\n s->caps[0x0b] = 0x00;\n \n","prefixes":["v4","09/17"]}