LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Joao Martins <joao.m.martins@oracle.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: "Ankur Arora" <ankur.a.arora@oracle.com>,
	"Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
	"Joao Martins" <joao.m.martins@oracle.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Borislav Petkov" <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org
Subject: [PATCH RFC 22/39] KVM: x86/xen: grant table init
Date: Wed, 20 Feb 2019 20:15:52 +0000	[thread overview]
Message-ID: <20190220201609.28290-23-joao.m.martins@oracle.com> (raw)
In-Reply-To: <20190220201609.28290-1-joao.m.martins@oracle.com>

Add support for guest grant table initialization. This is mostly
scaffolding at this point: we allocate grant table state and map
it globally.

Later patches add support for seeding the grant table with reserved
entries, and setup maptrack which would be used for grant map and unmap
operations.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
 arch/x86/include/asm/kvm_host.h | 19 +++++++++
 arch/x86/kvm/xen.c              | 88 +++++++++++++++++++++++++++++++++++++++++
 arch/x86/kvm/xen.h              |  1 +
 include/uapi/linux/kvm.h        | 13 ++++++
 4 files changed, 121 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 384247fc433d..e0cbc0899580 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -860,6 +860,23 @@ struct kvm_hv {
 	atomic_t num_mismatched_vp_indexes;
 };
 
+/* Xen grant table */
+struct kvm_grant_table {
+	u32 nr_frames;
+	u32 max_nr_frames;
+	union {
+		void **frames;
+		struct grant_entry_v1 **frames_v1;
+	};
+	gfn_t *frames_addr;
+	gpa_t initial_addr;
+	struct grant_entry_v1 *initial;
+
+	/* maptrack limits */
+	u32 max_mt_frames;
+	u32 nr_mt_frames;
+};
+
 /* Xen emulation context */
 struct kvm_xen {
 	u64 xen_hypercall;
@@ -871,6 +888,8 @@ struct kvm_xen {
 	struct idr port_to_evt;
 	unsigned long poll_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)];
 	struct mutex xen_lock;
+
+	struct kvm_grant_table gnttab;
 };
 
 enum kvm_xen_callback_via {
diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index e570c9b26563..b9e6e8f72d87 100644
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -17,6 +17,7 @@
 #include <xen/interface/xen.h>
 #include <xen/interface/vcpu.h>
 #include <xen/interface/event_channel.h>
+#include <xen/interface/grant_table.h>
 #include <xen/interface/sched.h>
 
 #include "trace.h"
@@ -35,6 +36,7 @@ struct evtchnfd {
 
 static int kvm_xen_evtchn_send(struct kvm_vcpu *vcpu, int port);
 static void *xen_vcpu_info(struct kvm_vcpu *v);
+static void kvm_xen_gnttab_free(struct kvm_xen *xen);
 
 #define XEN_DOMID_MIN	1
 #define XEN_DOMID_MAX	(DOMID_FIRST_RESERVED - 1)
@@ -513,6 +515,12 @@ int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
 		r = kvm_xen_domid_init(kvm, any, domid);
 		break;
 	}
+	case KVM_XEN_ATTR_TYPE_GNTTAB: {
+		struct kvm_xen_gnttab xevfd = data->u.gnttab;
+
+		r = kvm_vm_ioctl_xen_gnttab(kvm, &xevfd);
+		break;
+	}
 	default:
 		break;
 	}
@@ -969,6 +977,7 @@ void kvm_xen_destroy_vm(struct kvm *kvm)
 		put_page(virt_to_page(xen->shinfo));
 
 	kvm_xen_free_domid(kvm);
+	kvm_xen_gnttab_free(&kvm->arch.xen);
 }
 
 void kvm_xen_init(void)
@@ -1093,3 +1102,82 @@ int kvm_vm_ioctl_xen_eventfd(struct kvm *kvm, struct kvm_xen_eventfd *args)
 	return kvm_xen_eventfd_assign(kvm, &xen->port_to_evt,
 				      &xen->xen_lock, args);
 }
+
+int kvm_xen_gnttab_init(struct kvm *kvm, struct kvm_xen *xen,
+			struct kvm_xen_gnttab *op, int dom0)
+{
+	u32 max_mt_frames = op->init.max_maptrack_frames;
+	unsigned long initial = op->init.initial_frame;
+	struct kvm_grant_table *gnttab = &xen->gnttab;
+	u32 max_frames = op->init.max_frames;
+	struct page *page = NULL;
+	void *addr;
+
+	if (!dom0) {
+		if (!op->init.initial_frame ||
+		    offset_in_page(op->init.initial_frame))
+			return -EINVAL;
+
+		if (get_user_pages_fast(initial, 1, 1, &page) != 1)
+			return -EFAULT;
+
+		gnttab->initial_addr = initial;
+		gnttab->initial = page_to_virt(page);
+		put_page(page);
+	}
+
+	addr = kcalloc(max_frames, sizeof(gfn_t), GFP_KERNEL);
+	if (!addr)
+		goto out;
+	xen->gnttab.frames_addr = addr;
+
+	addr = kcalloc(max_frames, sizeof(addr), GFP_KERNEL);
+	if (!addr)
+		goto out;
+
+	gnttab->frames = addr;
+	gnttab->frames[0] = xen->gnttab.initial;
+	gnttab->max_nr_frames = max_frames;
+	gnttab->max_mt_frames = max_mt_frames;
+	gnttab->nr_mt_frames = 1;
+	gnttab->nr_frames = 0;
+
+	pr_debug("kvm_xen: dom%u: grant table limits (gnttab:%d maptrack:%d)\n",
+		 xen->domid, gnttab->max_nr_frames, gnttab->max_mt_frames);
+	return 0;
+
+out:
+	kfree(xen->gnttab.frames);
+	kfree(xen->gnttab.frames_addr);
+	if (page)
+		put_page(page);
+	memset(&xen->gnttab, 0, sizeof(xen->gnttab));
+	return -ENOMEM;
+}
+
+void kvm_xen_gnttab_free(struct kvm_xen *xen)
+{
+	struct kvm_grant_table *gnttab = &xen->gnttab;
+
+	kfree(gnttab->frames);
+	kfree(gnttab->frames_addr);
+}
+
+int kvm_vm_ioctl_xen_gnttab(struct kvm *kvm, struct kvm_xen_gnttab *op)
+{
+	int r = -EINVAL;
+
+	if (!op)
+		return r;
+
+	switch (op->flags) {
+	case KVM_XEN_GNTTAB_F_INIT:
+		r = kvm_xen_gnttab_init(kvm, &kvm->arch.xen, op, 0);
+		break;
+	default:
+		r = -ENOSYS;
+		break;
+	}
+
+	return r;
+}
diff --git a/arch/x86/kvm/xen.h b/arch/x86/kvm/xen.h
index 76ef2150c650..08ad4e1259df 100644
--- a/arch/x86/kvm/xen.h
+++ b/arch/x86/kvm/xen.h
@@ -37,6 +37,7 @@ int kvm_xen_setup_evtchn(struct kvm *kvm,
 void kvm_xen_init_vm(struct kvm *kvm);
 void kvm_xen_destroy_vm(struct kvm *kvm);
 int kvm_vm_ioctl_xen_eventfd(struct kvm *kvm, struct kvm_xen_eventfd *args);
+int kvm_vm_ioctl_xen_gnttab(struct kvm *kvm, struct kvm_xen_gnttab *op);
 void kvm_xen_vcpu_init(struct kvm_vcpu *vcpu);
 void kvm_xen_vcpu_uninit(struct kvm_vcpu *vcpu);
 void kvm_xen_init(void);
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 3212cad732dd..e4fb9bc34d61 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1503,6 +1503,18 @@ struct kvm_xen_hvm_attr {
 		struct {
 			__s32 domid;
 		} dom;
+		struct kvm_xen_gnttab {
+#define KVM_XEN_GNTTAB_F_INIT		0
+			__u32 flags;
+			union {
+				struct {
+					__u32 max_frames;
+					__u32 max_maptrack_frames;
+					__u64 initial_frame;
+				} init;
+				__u32 padding[4];
+			};
+		} gnttab;
 	} u;
 };
 
@@ -1514,6 +1526,7 @@ struct kvm_xen_hvm_attr {
 /* Available with KVM_CAP_XEN_HVM_EVTCHN */
 #define KVM_XEN_ATTR_TYPE_EVTCHN            0x4
 #define KVM_XEN_ATTR_TYPE_DOMID             0x5
+#define KVM_XEN_ATTR_TYPE_GNTTAB            0x6
 
 /* Secure Encrypted Virtualization command */
 enum sev_cmd_id {
-- 
2.11.0


  parent reply	other threads:[~2019-02-20 20:18 UTC|newest]

Thread overview: 126+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-20 20:15 [PATCH RFC 00/39] x86/KVM: Xen HVM guest support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 01/39] KVM: x86: fix Xen hypercall page msr handling Joao Martins
2019-02-22  1:30   ` Sean Christopherson
2019-02-22 11:47     ` Joao Martins
2019-02-22 12:51     ` Paolo Bonzini
2020-11-30 10:39       ` David Woodhouse
2020-11-30 11:03         ` Paolo Bonzini
2020-11-30 11:27           ` David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 02/39] KVM: x86/xen: intercept xen hypercalls if enabled Joao Martins
2019-02-21 18:29   ` Sean Christopherson
2019-02-21 20:56     ` Joao Martins
2019-02-22  0:30       ` Sean Christopherson
2019-02-22 12:50         ` Paolo Bonzini
2020-12-01  9:48   ` David Woodhouse
2020-12-01 11:19     ` David Woodhouse
2020-12-02 11:17       ` Joao Martins
2020-12-02 12:12         ` David Woodhouse
2020-12-02  5:19     ` Ankur Arora
2020-12-02  8:03       ` David Woodhouse
2020-12-02 18:20         ` Ankur Arora
2019-02-20 20:15 ` [PATCH RFC 03/39] KVM: x86/xen: register shared_info page Joao Martins
2020-12-01 13:07   ` David Woodhouse
2020-12-02  0:40     ` Ankur Arora
2020-12-02  1:26       ` David Woodhouse
2020-12-02  5:17         ` Ankur Arora
2020-12-02 10:50           ` Joao Martins
2020-12-02 10:44       ` Joao Martins
2020-12-02 12:20         ` David Woodhouse
2020-12-02 20:32           ` Ankur Arora
2020-12-03 10:16             ` David Woodhouse
2020-12-04 17:30               ` Sean Christopherson
2020-12-02 20:33         ` Ankur Arora
2020-12-12 12:07       ` David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 04/39] KVM: x86/xen: setup pvclock updates Joao Martins
2019-02-20 20:15 ` [PATCH RFC 05/39] KVM: x86/xen: update wallclock region Joao Martins
2019-02-20 20:15 ` [PATCH RFC 06/39] KVM: x86/xen: register vcpu info Joao Martins
2019-02-20 20:15 ` [PATCH RFC 07/39] KVM: x86/xen: register vcpu time info region Joao Martins
2019-02-20 20:15 ` [PATCH RFC 08/39] KVM: x86/xen: register steal clock Joao Martins
2019-02-20 20:15 ` [PATCH RFC 09/39] KVM: x86: declare Xen HVM guest capability Joao Martins
2019-02-20 20:15 ` [PATCH RFC 10/39] KVM: x86/xen: support upcall vector Joao Martins
2020-12-02 11:17   ` David Woodhouse
2020-12-02 13:12     ` Joao Martins
2020-12-02 16:47       ` David Woodhouse
2020-12-02 18:34         ` Joao Martins
2020-12-02 19:02           ` David Woodhouse
2020-12-02 20:12             ` Joao Martins
2020-12-02 20:37               ` David Woodhouse
2020-12-03  1:08             ` Ankur Arora
2020-12-08 16:08             ` David Woodhouse
2020-12-09  6:35               ` Ankur Arora
2020-12-09 10:27                 ` David Woodhouse
2020-12-09 10:51                   ` Joao Martins
2020-12-09 11:39                     ` David Woodhouse
2020-12-09 13:26                       ` Joao Martins
2020-12-09 15:41                         ` David Woodhouse
2020-12-09 16:12                           ` Joao Martins
2021-01-01 14:33           ` David Woodhouse
2021-01-05 12:11             ` Joao Martins
2021-01-05 13:23               ` David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 11/39] KVM: x86/xen: evtchn signaling via eventfd Joao Martins
2020-11-30  9:41   ` David Woodhouse
2020-11-30 12:17     ` Joao Martins
2020-11-30 12:55       ` David Woodhouse
2020-11-30 15:08         ` Joao Martins
2020-11-30 16:48           ` David Woodhouse
2020-11-30 17:15             ` Joao Martins
2020-11-30 18:01               ` David Woodhouse
2020-11-30 18:41                 ` Joao Martins
2020-11-30 19:04                   ` David Woodhouse
2020-11-30 19:25                     ` Joao Martins
2021-11-23 13:15           ` David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 12/39] KVM: x86/xen: store virq when assigning evtchn Joao Martins
     [not found]   ` <b750291466f3c89e0a393e48079c087704b217a5.camel@amazon.co.uk>
2022-02-10 12:17     ` Joao Martins
2022-02-10 15:23       ` [EXTERNAL] " David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 13/39] KVM: x86/xen: handle PV timers oneshot mode Joao Martins
2019-02-20 20:15 ` [PATCH RFC 14/39] KVM: x86/xen: handle PV IPI vcpu yield Joao Martins
2019-02-20 20:15 ` [PATCH RFC 15/39] KVM: x86/xen: handle PV spinlocks slowpath Joao Martins
2022-02-08 12:36   ` David Woodhouse
2022-02-10 12:17     ` Joao Martins
2022-02-10 14:11       ` David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 16/39] KVM: x86: declare Xen HVM evtchn offload capability Joao Martins
2019-02-20 20:15 ` [PATCH RFC 17/39] x86/xen: export vcpu_info and shared_info Joao Martins
2019-02-20 20:15 ` [PATCH RFC 18/39] x86/xen: make hypercall_page generic Joao Martins
2019-02-20 20:15 ` [PATCH RFC 19/39] xen/xenbus: xenbus uninit support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 20/39] xen-blkback: module_exit support Joao Martins
2019-02-25 18:57   ` Konrad Rzeszutek Wilk
2019-02-26 11:20     ` Joao Martins
2019-02-20 20:15 ` [PATCH RFC 21/39] KVM: x86/xen: domid allocation Joao Martins
2019-02-20 20:15 ` Joao Martins [this message]
2019-02-20 20:15 ` [PATCH RFC 23/39] KVM: x86/xen: grant table grow support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 24/39] KVM: x86/xen: backend hypercall support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 25/39] KVM: x86/xen: grant map support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 26/39] KVM: x86/xen: grant unmap support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 27/39] KVM: x86/xen: grant copy support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 28/39] KVM: x86/xen: interdomain evtchn support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 29/39] KVM: x86/xen: evtchn unmask support Joao Martins
2019-02-20 20:16 ` [PATCH RFC 30/39] KVM: x86/xen: add additional evtchn ops Joao Martins
2019-02-20 20:16 ` [PATCH RFC 31/39] xen-shim: introduce shim domain driver Joao Martins
2019-02-20 20:16 ` [PATCH RFC 32/39] xen/balloon: xen_shim_domain() support Joao Martins
2019-02-20 20:16 ` [PATCH RFC 33/39] xen/grant-table: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 34/39] xen/gntdev: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 35/39] xen/xenbus: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 36/39] drivers/xen: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 37/39] xen-netback: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 38/39] xen-blkback: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 39/39] KVM: x86: declare Xen HVM Dom0 capability Joao Martins
2019-02-20 21:09 ` [PATCH RFC 00/39] x86/KVM: Xen HVM guest support Paolo Bonzini
2019-02-21  0:29   ` Ankur Arora
2019-02-21 11:45   ` Joao Martins
2019-02-22 16:59     ` Paolo Bonzini
2019-03-12 17:14       ` Joao Martins
2019-04-08  6:44         ` Juergen Gross
2019-04-08 10:36           ` Joao Martins
2019-04-08 10:42             ` Juergen Gross
2019-04-08 17:31               ` Joao Martins
2019-04-09  0:35                 ` Stefano Stabellini
2019-04-10  5:50                   ` [Xen-devel] " Ankur Arora
2019-04-10 20:45                     ` Stefano Stabellini
2019-04-09  5:04                 ` Juergen Gross
2019-04-10  6:55                   ` Ankur Arora
2019-04-10  7:14                     ` Juergen Gross
2019-02-20 23:39 ` [Xen-devel] " Marek Marczykowski-Górecki
2019-02-21  0:31   ` Ankur Arora
2019-02-21  7:57   ` Juergen Gross
2019-02-21 12:00     ` Joao Martins
2019-02-21 11:55   ` Joao Martins

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190220201609.28290-23-joao.m.martins@oracle.com \
    --to=joao.m.martins@oracle.com \
    --cc=ankur.a.arora@oracle.com \
    --cc=boris.ostrovsky@oracle.com \
    --cc=bp@alien8.de \
    --cc=hpa@zytor.com \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=pbonzini@redhat.com \
    --cc=rkrcmar@redhat.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    --subject='Re: [PATCH RFC 22/39] KVM: x86/xen: grant table init' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).