From patchwork Mon Dec 5 17:31:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 13064872 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 19886C4332F for ; Mon, 5 Dec 2022 17:36:16 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p2FKQ-0007rV-Gj; Mon, 05 Dec 2022 12:32:31 -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 1p2FKM-0007qK-1B for qemu-devel@nongnu.org; Mon, 05 Dec 2022 12:32:26 -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 1p2FJx-0007PJ-O8 for qemu-devel@nongnu.org; Mon, 05 Dec 2022 12:32:25 -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=fSC47nmyjrTSaGKQHjkxgQzXzg+x00q1Wt6J8R7Jcvc=; b=UlnGxCIgX30Q/FOHpvyBDxPkUB PwBKAs0xivDjZcIokRyhBmgRO0vK+Xy10a4XQGjkTtYTqyHjlgd4N9gv9ts7J6nLssbNMAz1SZKzz 64Q5SL+gR5WWwTdG5maq1gvZsx6QxTpd4H0elietFLe7xKBcPlB/R4lNT31AaBwfo9tNwWaanqIrp t/wnSyS/HmAqwv6UAjnADw9tofOossT6lyIXCd0Pn+K/DWprdln3EIiNj2k+I80VdsTKbf+y43Phk N7uBEOgZ7FWR8QSV1hllwYZWiyNhbevDNyK9xbuJ5U11VxbegVmqhhzIXrv87/61uaPrE8D52mJMP 0XKaKmPg==; Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1p2FJp-007fzS-35; Mon, 05 Dec 2022 17:31:53 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1p2FJo-002YKr-Qm; Mon, 05 Dec 2022 17:31:52 +0000 From: David Woodhouse To: qemu-devel@nongnu.org Cc: Paolo Bonzini , Paul Durrant , Joao Martins , Ankur Arora Subject: [RFC PATCH 19/21] i386/xen: handle event channel upcall related hypercalls Date: Mon, 5 Dec 2022 17:31:35 +0000 Message-Id: <20221205173137.607044-20-dwmw2@infradead.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20221205173137.607044-1-dwmw2@infradead.org> References: <20221205173137.607044-1-dwmw2@infradead.org> MIME-Version: 1.0 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+0f5700dbc1736e95d806+7043+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: Ankur Arora Handle both HVMOP_set_param(.index = HVM_PARAM_CALLBACK_IRQ) and HVMOP_set_evtchn_upcall_vector which set the system-wide and per-vCPU upcall vectors respectively. The former injects the vector directly to the vCPU, which KVM handles for us when entering the vCPU with vcpu_info->evtchn_upcall_pending set. The latter is injected to the local APIC just like an MSI. The GSI and PCI_INTX delivery methods are not supported. yet; those need to simulate a level-triggered event on the I/OAPIC. Signed-off-by: Ankur Arora Signed-off-by: Joao Martins [dwmw2: Rework for upstream kernel changes in evtchn handling] Signed-off-by: David Woodhouse --- target/i386/kvm/kvm.c | 1 + target/i386/trace-events | 1 + target/i386/xen.c | 132 +++++++++++++++++++++++++++++++++++++-- 3 files changed, 129 insertions(+), 5 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 6396d11f1e..8a381c2073 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -36,6 +36,7 @@ #include "hyperv.h" #include "hyperv-proto.h" #include "xen.h" +#include "hw/xen/xen.h" #include "exec/gdbstub.h" #include "qemu/host-utils.h" diff --git a/target/i386/trace-events b/target/i386/trace-events index 1c6c44f291..3ff3ec6f61 100644 --- a/target/i386/trace-events +++ b/target/i386/trace-events @@ -16,3 +16,4 @@ kvm_sev_attestation_report(const char *mnonce, const char *data) "mnonce %s data kvm_xen_hypercall(int cpu, uint8_t cpl, uint64_t input, uint64_t a0, uint64_t a1, uint64_t a2, uint64_t ret) "xen_hypercall: cpu %d cpl %d input %" PRIu64 " a0 0x%" PRIx64 " a1 0x%" PRIx64 " a2 0x%" PRIx64" ret 0x%" PRIu64 kvm_xen_set_shared_info(uint64_t gfn) "shared info at gfn 0x%" PRIx64 kvm_xen_set_vcpu_attr(int cpu, int type, uint64_t gpa) "vcpu attr cpu %d type %d gpa 0x%" PRIu64 +kvm_xen_set_vcpu_callback(int cpu, int vector) "callback vcpu %d vector %d" diff --git a/target/i386/xen.c b/target/i386/xen.c index 6f0c46c018..21146204e1 100644 --- a/target/i386/xen.c +++ b/target/i386/xen.c @@ -19,6 +19,7 @@ #include "standard-headers/xen/version.h" #include "standard-headers/xen/memory.h" #include "standard-headers/xen/hvm/hvm_op.h" +#include "standard-headers/xen/hvm/params.h" #include "standard-headers/xen/vcpu.h" #define PAGE_OFFSET 0xffffffff80000000UL @@ -34,6 +35,8 @@ #define HCALL_ERR 0 #endif +static QemuMutex xen_global_mutex; + static void *gpa_to_hva(uint64_t gpa) { MemoryRegionSection mrs; @@ -93,6 +96,8 @@ int kvm_xen_init(KVMState *s, uint32_t xen_version) return ret; } + qemu_mutex_init(&xen_global_mutex); + return 0; } @@ -124,7 +129,8 @@ static int kvm_xen_hcall_xen_version(struct kvm_xen_exit *exit, X86CPU *cpu, * XENFEAT_memory_op_vnode_supported * XENFEAT_writable_page_tables */ - fi->submap = (1U << XENFEAT_auto_translated_physmap); + fi->submap = (1U << XENFEAT_auto_translated_physmap) | + (1U << XENFEAT_hvm_callback_vector); break; } } @@ -200,18 +206,131 @@ static int kvm_xen_hcall_memory_op(struct kvm_xen_exit *exit, return err ? HCALL_ERR : 0; } -static int kvm_xen_hcall_hvm_op(struct kvm_xen_exit *exit, +static void xen_vcpu_set_callback(CPUState *cs, run_on_cpu_data data) +{ + struct kvm_xen_vcpu_attr xvuv; + uint8_t vector = data.host_int; + int err; + + xvuv.type = KVM_XEN_VCPU_ATTR_TYPE_UPCALL_VECTOR; + xvuv.u.vector = vector; + err = kvm_vcpu_ioctl(cs, KVM_XEN_HVM_SET_ATTR, &xvuv); + if (err < 0) { + return; + } + + trace_kvm_xen_set_vcpu_callback(cs->cpu_index, vector); +} + +static int handle_set_param(struct kvm_xen_exit *exit, X86CPU *cpu, + uint64_t arg) +{ + CPUState *cs = CPU(cpu); + struct xen_hvm_param *hp; + int err = 0, via; + + hp = gva_to_hva(cs, arg); + if (!hp) { + err = -EFAULT; + goto out; + } + + if (hp->domid != DOMID_SELF) { + err = -EINVAL; + goto out; + } + +#define CALLBACK_VIA_TYPE_SHIFT 56 +#define CALLBACK_VIA_TYPE_GSI 0x0 +#define CALLBACK_VIA_TYPE_PCI_INTX 0x1 +#define CALLBACK_VIA_TYPE_VECTOR 0x2 +#define CALLBACK_VIA_TYPE_EVTCHN 0x3 + switch (hp->index) { + case HVM_PARAM_CALLBACK_IRQ: + via = hp->value >> CALLBACK_VIA_TYPE_SHIFT; + if (via == CALLBACK_VIA_TYPE_GSI || + via == CALLBACK_VIA_TYPE_PCI_INTX) { + err = -ENOSYS; + goto out; + } else if (via == CALLBACK_VIA_TYPE_VECTOR) { + struct kvm_xen_hvm_attr xhuv; + xhuv.type = KVM_XEN_ATTR_TYPE_UPCALL_VECTOR; + xhuv.u.vector = (uint8_t)hp->value; + err = kvm_vm_ioctl(cs->kvm_state, KVM_XEN_HVM_SET_ATTR, &xhuv); + } + break; + default: + err = -ENOSYS; + goto out; + } + + +out: + exit->u.hcall.result = err; + return err ? HCALL_ERR : 0; +} + +static int kvm_xen_hcall_evtchn_upcall_vector(struct kvm_xen_exit *exit, + X86CPU *cpu, uint64_t arg) +{ + struct xen_hvm_evtchn_upcall_vector *up; + CPUState *target_cs; + int err = 0, vector; + + up = gva_to_hva(CPU(cpu), arg); + if (!up) { + err = -EFAULT; + goto out; + } + + vector = up->vector; + if (vector < 0x10) { + err = -EINVAL; + goto out; + } + + target_cs = qemu_get_cpu(up->vcpu); + if (!target_cs) { + err = -EINVAL; + goto out; + } + if (X86_CPU(target_cs) == cpu) { + struct kvm_xen_vcpu_attr xvuv; + + xvuv.type = KVM_XEN_VCPU_ATTR_TYPE_UPCALL_VECTOR; + xvuv.u.vector = vector; + err = kvm_vcpu_ioctl(target_cs, KVM_XEN_HVM_SET_ATTR, &xvuv); + if (err < 0) { + goto out; + } + trace_kvm_xen_set_vcpu_callback(target_cs->cpu_index, vector); + } else { + do_run_on_cpu(target_cs, xen_vcpu_set_callback, + RUN_ON_CPU_HOST_INT(vector), &xen_global_mutex); + } + +out: + exit->u.hcall.result = err; + return err ? HCALL_ERR : 0; +} + +static int kvm_xen_hcall_hvm_op(struct kvm_xen_exit *exit, X86CPU *cpu, int cmd, uint64_t arg) { + int ret = -ENOSYS; switch (cmd) { case HVMOP_pagetable_dying: { exit->u.hcall.result = -ENOSYS; return 0; } + case HVMOP_set_param: { + ret = handle_set_param(exit, cpu, arg); + break; + } } - exit->u.hcall.result = -ENOSYS; - return HCALL_ERR; + exit->u.hcall.result = ret; + return ret ? HCALL_ERR : 0; } static int xen_set_vcpu_attr(CPUState *cs, uint16_t type, uint64_t gpa) @@ -327,13 +446,16 @@ static int __kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit) } switch (code) { + case HVMOP_set_evtchn_upcall_vector: + return kvm_xen_hcall_evtchn_upcall_vector(exit, cpu, + exit->u.hcall.params[0]); case __HYPERVISOR_vcpu_op: return kvm_xen_hcall_vcpu_op(exit, cpu, exit->u.hcall.params[0], exit->u.hcall.params[1], exit->u.hcall.params[2]); case __HYPERVISOR_hvm_op: - return kvm_xen_hcall_hvm_op(exit, exit->u.hcall.params[0], + return kvm_xen_hcall_hvm_op(exit, cpu, exit->u.hcall.params[0], exit->u.hcall.params[1]); case __HYPERVISOR_memory_op: return kvm_xen_hcall_memory_op(exit, exit->u.hcall.params[0],