From nobody Sat Jul 12 04:29:33 2025 Delivered-To: importer2@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer2=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1677679101006356.4209285726755; Wed, 1 Mar 2023 05:58:21 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pXMwF-0006NC-Oa; Wed, 01 Mar 2023 08:56:11 -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 1pXMt1-00008F-1R for qemu-devel@nongnu.org; Wed, 01 Mar 2023 08:52:55 -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 1pXMsu-0002l0-1i for qemu-devel@nongnu.org; Wed, 01 Mar 2023 08:52:50 -0500 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 1pXMsc-001f3k-9h; Wed, 01 Mar 2023 13:52:26 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.96 #2 (Red Hat Linux)) id 1pXMsc-0049Uh-0y; Wed, 01 Mar 2023 13:52:26 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description; bh=aswL+8xMm+Hzl6EatM7k+VD8mfqVJ8Oo9hNujKHxjds=; b=jUmgW4k6JTZfhbnlhbndt8eh4j UqRAOb+9McO3d4EONCayWZecJgr4mJWkoBpBkPClHlgT0ZgvGB/TPtY/xOCyJRPT/YxQKlS/ujeRS twVJWayw87gmMSepiQ1kxcTmJgLLwHiQFMDRZd0xLyLqHId6NObVMYNVJJDkjixmYJOogWq+ZGQNd 8nll57UrjbcWq3GgDZArKhQfSrePMGop2FOsbZKEkmkWrjB6Sa1CBaFHRLDtciw+IAqBPdd/EyS+y 73kV5wpVldFumbQqqgnbkMAnOu8cyBLDA9Fr2hJ/obMw+Qn4mGOZwhDrmVrI+ttvSDGqmgtgnTRcB JI72QNng==; 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, Stefano Stabellini , vikram.garhwal@amd.com Subject: [PATCH v15 17/60] i386/xen: implement HYPERVISOR_memory_op Date: Wed, 1 Mar 2023 13:51:40 +0000 Message-Id: <20230301135223.988336-18-dwmw2@infradead.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230301135223.988336-1-dwmw2@infradead.org> References: <20230301135223.988336-1-dwmw2@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+f4e15e254fb7e3cd38fc+7129+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+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1677679102006100001 From: Joao Martins Specifically XENMEM_add_to_physmap with space XENMAPSPACE_shared_info to allow the guest to set its shared_info page. Signed-off-by: Joao Martins [dwmw2: Use the xen_overlay device, add compat support] Signed-off-by: David Woodhouse Reviewed-by: Paul Durrant --- target/i386/kvm/trace-events | 1 + target/i386/kvm/xen-compat.h | 27 ++++++++ target/i386/kvm/xen-emu.c | 116 ++++++++++++++++++++++++++++++++++- 3 files changed, 143 insertions(+), 1 deletion(-) create mode 100644 target/i386/kvm/xen-compat.h diff --git a/target/i386/kvm/trace-events b/target/i386/kvm/trace-events index bb732e1da8..8e9f269f56 100644 --- a/target/i386/kvm/trace-events +++ b/target/i386/kvm/trace-events @@ -9,3 +9,4 @@ 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, uint6= 4_t a1, uint64_t a2, uint64_t ret) "xen_hypercall: cpu %d cpl %d input %" P= RIu64 " a0 0x%" PRIx64 " a1 0x%" PRIx64 " a2 0x%" PRIx64" ret 0x%" PRIx64 kvm_xen_soft_reset(void) "" +kvm_xen_set_shared_info(uint64_t gfn) "shared info at gfn 0x%" PRIx64 diff --git a/target/i386/kvm/xen-compat.h b/target/i386/kvm/xen-compat.h new file mode 100644 index 0000000000..2d852e2a28 --- /dev/null +++ b/target/i386/kvm/xen-compat.h @@ -0,0 +1,27 @@ +/* + * Xen HVM emulation support in KVM + * + * Copyright =C2=A9 2022 Amazon.com, Inc. or its affiliates. All Rights Re= served. + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + * + */ + +#ifndef QEMU_I386_KVM_XEN_COMPAT_H +#define QEMU_I386_KVM_XEN_COMPAT_H + +#include "hw/xen/interface/memory.h" + +typedef uint32_t compat_pfn_t; +typedef uint32_t compat_ulong_t; + +struct compat_xen_add_to_physmap { + domid_t domid; + uint16_t size; + unsigned int space; + compat_ulong_t idx; + compat_pfn_t gpfn; +}; + +#endif /* QEMU_I386_XEN_COMPAT_H */ diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c index be6d85f2cb..5d79827128 100644 --- a/target/i386/kvm/xen-emu.c +++ b/target/i386/kvm/xen-emu.c @@ -12,6 +12,7 @@ #include "qemu/osdep.h" #include "qemu/log.h" #include "qemu/main-loop.h" +#include "hw/xen/xen.h" #include "sysemu/kvm_int.h" #include "sysemu/kvm_xen.h" #include "kvm/kvm_i386.h" @@ -24,6 +25,15 @@ =20 #include "hw/xen/interface/version.h" #include "hw/xen/interface/sched.h" +#include "hw/xen/interface/memory.h" + +#include "xen-compat.h" + +#ifdef TARGET_X86_64 +#define hypercall_compat32(longmode) (!(longmode)) +#else +#define hypercall_compat32(longmode) (false) +#endif =20 static int kvm_gva_rw(CPUState *cs, uint64_t gva, void *_buf, size_t sz, bool is_write) @@ -175,13 +185,114 @@ static bool kvm_xen_hcall_xen_version(struct kvm_xen= _exit *exit, X86CPU *cpu, return true; } =20 +static int xen_set_shared_info(uint64_t gfn) +{ + uint64_t gpa =3D gfn << TARGET_PAGE_BITS; + int err; + + QEMU_IOTHREAD_LOCK_GUARD(); + + /* + * The xen_overlay device tells KVM about it too, since it had to + * do that on migration load anyway (unless we're going to jump + * through lots of hoops to maintain the fiction that this isn't + * KVM-specific. + */ + err =3D xen_overlay_map_shinfo_page(gpa); + if (err) { + return err; + } + + trace_kvm_xen_set_shared_info(gfn); + + return err; +} + +static int add_to_physmap_one(uint32_t space, uint64_t idx, uint64_t gfn) +{ + switch (space) { + case XENMAPSPACE_shared_info: + if (idx > 0) { + return -EINVAL; + } + return xen_set_shared_info(gfn); + + case XENMAPSPACE_grant_table: + case XENMAPSPACE_gmfn: + case XENMAPSPACE_gmfn_range: + return -ENOTSUP; + + case XENMAPSPACE_gmfn_foreign: + case XENMAPSPACE_dev_mmio: + return -EPERM; + + default: + return -EINVAL; + } +} + +static int do_add_to_physmap(struct kvm_xen_exit *exit, X86CPU *cpu, + uint64_t arg) +{ + struct xen_add_to_physmap xatp; + CPUState *cs =3D CPU(cpu); + + if (hypercall_compat32(exit->u.hcall.longmode)) { + struct compat_xen_add_to_physmap xatp32; + + qemu_build_assert(sizeof(struct compat_xen_add_to_physmap) =3D=3D = 16); + if (kvm_copy_from_gva(cs, arg, &xatp32, sizeof(xatp32))) { + return -EFAULT; + } + xatp.domid =3D xatp32.domid; + xatp.size =3D xatp32.size; + xatp.space =3D xatp32.space; + xatp.idx =3D xatp32.idx; + xatp.gpfn =3D xatp32.gpfn; + } else { + if (kvm_copy_from_gva(cs, arg, &xatp, sizeof(xatp))) { + return -EFAULT; + } + } + + if (xatp.domid !=3D DOMID_SELF && xatp.domid !=3D xen_domid) { + return -ESRCH; + } + + return add_to_physmap_one(xatp.space, xatp.idx, xatp.gpfn); +} + +static bool kvm_xen_hcall_memory_op(struct kvm_xen_exit *exit, X86CPU *cpu, + int cmd, uint64_t arg) +{ + int err; + + switch (cmd) { + case XENMEM_add_to_physmap: + err =3D do_add_to_physmap(exit, cpu, arg); + break; + + default: + return false; + } + + exit->u.hcall.result =3D err; + return true; +} + int kvm_xen_soft_reset(void) { + int err; + assert(qemu_mutex_iothread_locked()); =20 trace_kvm_xen_soft_reset(); =20 - /* Nothing to reset... yet. */ + err =3D xen_overlay_map_shinfo_page(INVALID_GFN); + if (err) { + return err; + } + return 0; } =20 @@ -270,6 +381,9 @@ static bool do_kvm_xen_handle_exit(X86CPU *cpu, struct = kvm_xen_exit *exit) case __HYPERVISOR_sched_op: return kvm_xen_hcall_sched_op(exit, cpu, exit->u.hcall.params[0], exit->u.hcall.params[1]); + case __HYPERVISOR_memory_op: + return kvm_xen_hcall_memory_op(exit, cpu, exit->u.hcall.params[0], + exit->u.hcall.params[1]); case __HYPERVISOR_xen_version: return kvm_xen_hcall_xen_version(exit, cpu, exit->u.hcall.params[0= ], exit->u.hcall.params[1]); --=20 2.39.0