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 4E126C4167B for ; Fri, 30 Dec 2022 12:14:01 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pBEG2-00083B-2L; Fri, 30 Dec 2022 07:13:06 -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 1pBEFr-0007lE-VZ for qemu-devel@nongnu.org; Fri, 30 Dec 2022 07:12:55 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pBEFl-0004xr-2Q for qemu-devel@nongnu.org; Fri, 30 Dec 2022 07:12:55 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=5mo+y135udXICdD3NALTktF2BemxUCZjwha6G1c5CTc=; b=gnHZqiqqK4Et+scAJT9ktb8g39 5Rab6pmuqS5KXgY897jp+7Y8E+cRwdN56lfOFojCIZQ4IhFylb5Z/Imm/3a4FXv1c+RdpMjJzB4B0 sXP/J2OrpaleUcpw1iN/g8R/e9HnwZlcoJPa9KrZeStfxXP3uT5DB1iOSxPCETYxiVGyXZeasQgGc tNRLXckK1D8P5goqKOv193R1oR7jqNxsjRrtXJ5u1AAS4oWLhgSxwbaeclxeIL4sQ21xToxY+TlQQ 6w6lZJgKGp35uyCTlRx8ENUo+ZCysQsF1ffTosI+GPfgUQfaPlKT9M059le83+ZPj3CWN9/G8UeUj SSJ/ysVA==; Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pBEFk-00Ac80-LA; Fri, 30 Dec 2022 12:12:48 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pBEFZ-005Nvo-Br; Fri, 30 Dec 2022 12:12:37 +0000 From: David Woodhouse To: 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 Subject: [RFC PATCH v5 10/52] i386/xen: handle guest hypercalls Date: Fri, 30 Dec 2022 12:11:53 +0000 Message-Id: <20221230121235.1282915-11-dwmw2@infradead.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20221230121235.1282915-1-dwmw2@infradead.org> References: <20221230121235.1282915-1-dwmw2@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+1132f1bfe572585e6c7f+7068+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.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: Joao Martins This means handling the new exit reason for Xen but still crashing on purpose. As we implement each of the hypercalls we will then return the right return code. Signed-off-by: Joao Martins [dwmw2: Add CPL to hypercall tracing, disallow hypercalls from CPL > 0] Signed-off-by: David Woodhouse --- target/i386/kvm/kvm.c | 5 ++++ target/i386/kvm/trace-events | 3 +++ target/i386/kvm/xen-emu.c | 44 ++++++++++++++++++++++++++++++++++++ target/i386/kvm/xen-emu.h | 1 + 4 files changed, 53 insertions(+) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index be5e50b4fc..f365e56fcc 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -5477,6 +5477,11 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run) assert(run->msr.reason == KVM_MSR_EXIT_REASON_FILTER); ret = kvm_handle_wrmsr(cpu, run); break; +#ifdef CONFIG_XEN_EMU + case KVM_EXIT_XEN: + ret = kvm_xen_handle_exit(cpu, &run->xen); + break; +#endif default: fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason); ret = -1; diff --git a/target/i386/kvm/trace-events b/target/i386/kvm/trace-events index 7c369db1e1..cd6f842b1f 100644 --- a/target/i386/kvm/trace-events +++ b/target/i386/kvm/trace-events @@ -5,3 +5,6 @@ kvm_x86_fixup_msi_error(uint32_t gsi) "VT-d failed to remap interrupt for GSI %" kvm_x86_add_msi_route(int virq) "Adding route entry for virq %d" kvm_x86_remove_msi_route(int virq) "Removing route entry for virq %d" kvm_x86_update_msi_routes(int num) "Updated %d MSI routes" + +# xen-emu.c +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%" PRIx64 diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c index 4883b95d9d..476f464ee2 100644 --- a/target/i386/kvm/xen-emu.c +++ b/target/i386/kvm/xen-emu.c @@ -10,10 +10,12 @@ */ #include "qemu/osdep.h" +#include "qemu/log.h" #include "sysemu/kvm_int.h" #include "sysemu/kvm_xen.h" #include "kvm/kvm_i386.h" #include "xen-emu.h" +#include "trace.h" int kvm_xen_init(KVMState *s, uint32_t hypercall_msr) { @@ -84,3 +86,45 @@ uint32_t kvm_xen_get_caps(void) { return kvm_state->xen_caps; } + +static bool do_kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit) +{ + uint16_t code = exit->u.hcall.input; + + if (exit->u.hcall.cpl > 0) { + exit->u.hcall.result = -EPERM; + return true; + } + + switch (code) { + default: + return false; + } +} + +int kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit) +{ + if (exit->type != KVM_EXIT_XEN_HCALL) { + return -1; + } + + if (!do_kvm_xen_handle_exit(cpu, exit)) { + /* + * Some hypercalls will be deliberately "implemented" by returning + * -ENOSYS. This case is for hypercalls which are unexpected. + */ + exit->u.hcall.result = -ENOSYS; + qemu_log_mask(LOG_UNIMP, "Unimplemented Xen hypercall %" + PRId64 " (0x%" PRIx64 " 0x%" PRIx64 " 0x%" PRIx64 ")\n", + (uint64_t)exit->u.hcall.input, + (uint64_t)exit->u.hcall.params[0], + (uint64_t)exit->u.hcall.params[1], + (uint64_t)exit->u.hcall.params[2]); + } + + trace_kvm_xen_hypercall(CPU(cpu)->cpu_index, exit->u.hcall.cpl, + exit->u.hcall.input, exit->u.hcall.params[0], + exit->u.hcall.params[1], exit->u.hcall.params[2], + exit->u.hcall.result); + return 0; +} diff --git a/target/i386/kvm/xen-emu.h b/target/i386/kvm/xen-emu.h index d62f1d8ed8..21faf6bf38 100644 --- a/target/i386/kvm/xen-emu.h +++ b/target/i386/kvm/xen-emu.h @@ -25,5 +25,6 @@ int kvm_xen_init(KVMState *s, uint32_t hypercall_msr); int kvm_xen_init_vcpu(CPUState *cs); +int kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit); #endif /* QEMU_I386_KVM_XEN_EMU_H */ -- 2.35.3