From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C3618C636BD for ; Sat, 28 Jan 2023 08:22:16 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pLgKs-0000K7-SY; Sat, 28 Jan 2023 03:13:19 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pLgJT-0005vB-QM for qemu-devel@nongnu.org; Sat, 28 Jan 2023 03:11:52 -0500 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pLgJL-0007qu-L2 for qemu-devel@nongnu.org; Sat, 28 Jan 2023 03:11:51 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=QXkn2Hemm66Z1lj2wcjL4pZQVAv8ymlfuhyhDDyyH/c=; b=R4vUWL+7lW6yadqQzMUqATfJYm ++oR+CjVwJTHA5jA9LKwxQO0fJItI1FgSBc2RioS/x4MlIAI3uE6xI/LEi+yXdQBfkDxEI9cbAQ3b QDpfxgKoDL/ot9GEpzzT5IuQM/9jV6xn0h7TnXJKBhCJ7HOLLj/4vvuAkNWZlpdo85PJdSiVEQFNe kN5iZYq+PdUZaKCUpwZ/Obcfns8h0Mq2BY/OlJxJydVEEQ1ScsslviFKviw036L36GWEgHu1mpB1o BMONM+jH0lXTSs02WDfV4S3ryPfKsWeIzc4jpqnV6uSopW2FWkNXkmNcs2gPVA46fsQ41VWsb6DmM nrW3E73w==; Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1pLgIR-0039wO-22; Sat, 28 Jan 2023 08:10:53 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.96 #2 (Red Hat Linux)) id 1pLgIx-006mJZ-1S; Sat, 28 Jan 2023 08:11:19 +0000 From: David Woodhouse To: Peter Maydell , qemu-devel@nongnu.org Cc: Paolo Bonzini , Paul Durrant , Joao Martins , Ankur Arora , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Thomas Huth , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Juan Quintela , "Dr . David Alan Gilbert" , Claudio Fontana , Julien Grall , "Michael S. Tsirkin" , Marcel Apfelbaum , armbru@redhat.com Subject: [PATCH v9 29/58] hw/xen: Implement EVTCHNOP_close Date: Sat, 28 Jan 2023 08:10:44 +0000 Message-Id: <20230128081113.1615111-30-dwmw2@infradead.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230128081113.1615111-1-dwmw2@infradead.org> References: <20230128081113.1615111-1-dwmw2@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1:d65d:64ff:fe57:4e05; envelope-from=BATV+e8fc867402dd322853dc+7097+infradead.org+dwmw2@desiato.srs.infradead.org; helo=desiato.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: David Woodhouse It calls an internal close_port() helper which will also be used from EVTCHNOP_reset and will actually do the work to disconnect/unbind a port once any of that is actually implemented in the first place. That in turn calls a free_port() internal function which will be in error paths after allocation. Signed-off-by: David Woodhouse --- hw/i386/kvm/xen_evtchn.c | 121 ++++++++++++++++++++++++++++++++++++++ hw/i386/kvm/xen_evtchn.h | 2 + target/i386/kvm/xen-emu.c | 12 ++++ 3 files changed, 135 insertions(+) diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c index f43d904ca0..9fce61fab4 100644 --- a/hw/i386/kvm/xen_evtchn.c +++ b/hw/i386/kvm/xen_evtchn.c @@ -21,6 +21,7 @@ #include "hw/sysbus.h" #include "hw/xen/xen.h" + #include "xen_evtchn.h" #include "xen_overlay.h" @@ -40,6 +41,41 @@ typedef struct XenEvtchnPort { uint16_t type_val; /* pirq# / virq# / remote port according to type */ } XenEvtchnPort; +/* 32-bit compatibility definitions, also used natively in 32-bit build */ +struct compat_arch_vcpu_info { + unsigned int cr2; + unsigned int pad[5]; +}; + +struct compat_vcpu_info { + uint8_t evtchn_upcall_pending; + uint8_t evtchn_upcall_mask; + uint16_t pad; + uint32_t evtchn_pending_sel; + struct compat_arch_vcpu_info arch; + struct vcpu_time_info time; +}; /* 64 bytes (x86) */ + +struct compat_arch_shared_info { + unsigned int max_pfn; + unsigned int pfn_to_mfn_frame_list_list; + unsigned int nmi_reason; + unsigned int p2m_cr3; + unsigned int p2m_vaddr; + unsigned int p2m_generation; + uint32_t wc_sec_hi; +}; + +struct compat_shared_info { + struct compat_vcpu_info vcpu_info[XEN_LEGACY_MAX_VCPUS]; + uint32_t evtchn_pending[32]; + uint32_t evtchn_mask[32]; + uint32_t wc_version; /* Version counter: see vcpu_time_info_t. */ + uint32_t wc_sec; + uint32_t wc_nsec; + struct compat_arch_shared_info arch; +}; + #define COMPAT_EVTCHN_2L_NR_CHANNELS 1024 /* @@ -257,3 +293,88 @@ int xen_evtchn_status_op(struct evtchn_status *status) qemu_mutex_unlock(&s->port_lock); return 0; } + +static int clear_port_pending(XenEvtchnState *s, evtchn_port_t port) +{ + void *p = xen_overlay_get_shinfo_ptr(); + if (!p) + return -ENOTSUP; + + if (xen_is_long_mode()) { + struct shared_info *shinfo = p; + const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]); + typeof(shinfo->evtchn_pending[0]) mask; + int idx = port / bits_per_word; + int offset = port % bits_per_word; + + mask = 1UL << offset; + + qatomic_fetch_and(&shinfo->evtchn_pending[idx], ~mask); + } else { + struct compat_shared_info *shinfo = p; + const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]); + typeof(shinfo->evtchn_pending[0]) mask; + int idx = port / bits_per_word; + int offset = port % bits_per_word; + + mask = 1UL << offset; + + qatomic_fetch_and(&shinfo->evtchn_pending[idx], ~mask); + } + return 0; +} + +static void free_port(XenEvtchnState *s, evtchn_port_t port) +{ + s->port_table[port].type = EVTCHNSTAT_closed; + s->port_table[port].type_val = 0; + s->port_table[port].vcpu = 0; + + if (s->nr_ports == port + 1) { + do { + s->nr_ports--; + } while (s->nr_ports && + s->port_table[s->nr_ports - 1].type == EVTCHNSTAT_closed); + } + + /* Clear pending event to avoid unexpected behavior on re-bind. */ + clear_port_pending(s, port); +} + +static int close_port(XenEvtchnState *s, evtchn_port_t port) +{ + XenEvtchnPort *p = &s->port_table[port]; + + switch (p->type) { + case EVTCHNSTAT_closed: + return -ENOENT; + + default: + break; + } + + free_port(s, port); + return 0; +} + +int xen_evtchn_close_op(struct evtchn_close *close) +{ + XenEvtchnState *s = xen_evtchn_singleton; + int ret; + + if (!s) { + return -ENOTSUP; + } + + if (!valid_port(close->port)) { + return -EINVAL; + } + + qemu_mutex_lock(&s->port_lock); + + ret = close_port(s, close->port); + + qemu_mutex_unlock(&s->port_lock); + + return ret; +} diff --git a/hw/i386/kvm/xen_evtchn.h b/hw/i386/kvm/xen_evtchn.h index 76467636ee..cb3924941a 100644 --- a/hw/i386/kvm/xen_evtchn.h +++ b/hw/i386/kvm/xen_evtchn.h @@ -16,6 +16,8 @@ void xen_evtchn_create(void); int xen_evtchn_set_callback_param(uint64_t param); struct evtchn_status; +struct evtchn_close; int xen_evtchn_status_op(struct evtchn_status *status); +int xen_evtchn_close_op(struct evtchn_close *close); #endif /* QEMU_XEN_EVTCHN_H */ diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c index ddd4db5853..136b12bf1b 100644 --- a/target/i386/kvm/xen-emu.c +++ b/target/i386/kvm/xen-emu.c @@ -802,6 +802,18 @@ static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit *exit, X86CPU *cpu, } break; } + case EVTCHNOP_close: { + struct evtchn_close close; + + qemu_build_assert(sizeof(close) == 4); + if (kvm_copy_from_gva(cs, arg, &close, sizeof(close))) { + err = -EFAULT; + break; + } + + err = xen_evtchn_close_op(&close); + break; + } default: return false; } -- 2.39.0