From: David Woodhouse <dwmw2@infradead.org>
To: qemu-devel@nongnu.org
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Paul Durrant" <paul@xen.org>,
"Joao Martins" <joao.m.martins@oracle.com>,
"Ankur Arora" <ankur.a.arora@oracle.com>,
"Philippe Mathieu-Daudé" <philmd@linaro.org>,
"Thomas Huth" <thuth@redhat.com>,
"Alex Bennée" <alex.bennee@linaro.org>,
"Juan Quintela" <quintela@redhat.com>,
"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
"Claudio Fontana" <cfontana@suse.de>,
"Julien Grall" <julien@xen.org>
Subject: [PATCH v6 16/51] i386/xen: implement HYPERVISOR_memory_op
Date: Tue, 10 Jan 2023 12:20:07 +0000 [thread overview]
Message-ID: <20230110122042.1562155-17-dwmw2@infradead.org> (raw)
In-Reply-To: <20230110122042.1562155-1-dwmw2@infradead.org>
From: Joao Martins <joao.m.martins@oracle.com>
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 <joao.m.martins@oracle.com>
[dwmw2: Use the xen_overlay device, add compat support]
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
target/i386/kvm/trace-events | 1 +
target/i386/kvm/xen-compat.h | 27 +++++++++
target/i386/kvm/xen-emu.c | 114 ++++++++++++++++++++++++++++++++++-
3 files changed, 141 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 cd6f842b1f..0a47c26e80 100644
--- a/target/i386/kvm/trace-events
+++ b/target/i386/kvm/trace-events
@@ -8,3 +8,4 @@ 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, 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
+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..0b7088662a
--- /dev/null
+++ b/target/i386/kvm/xen-compat.h
@@ -0,0 +1,27 @@
+/*
+ * Xen HVM emulation support in KVM
+ *
+ * Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef QEMU_I386_KVM_XEN_COMPAT_H
+#define QEMU_I386_KVM_XEN_COMPAT_H
+
+#include "standard-headers/xen/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 80f09f33df..1f2e8275bc 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -11,6 +11,7 @@
#include "qemu/osdep.h"
#include "qemu/log.h"
+#include "hw/xen/xen.h"
#include "sysemu/kvm_int.h"
#include "sysemu/kvm_xen.h"
#include "kvm/kvm_i386.h"
@@ -23,6 +24,15 @@
#include "standard-headers/xen/version.h"
#include "standard-headers/xen/sched.h"
+#include "standard-headers/xen/memory.h"
+
+#include "xen-compat.h"
+
+#ifdef TARGET_X86_64
+#define hypercall_compat32(longmode) (!(longmode))
+#else
+#define hypercall_compat32(longmode) (false)
+#endif
static int kvm_gva_rw(CPUState *cs, uint64_t gva, void *_buf, size_t sz,
bool is_write)
@@ -174,9 +184,108 @@ static bool kvm_xen_hcall_xen_version(struct kvm_xen_exit *exit, X86CPU *cpu,
return true;
}
+static int xen_set_shared_info(uint64_t gfn)
+{
+ uint64_t gpa = gfn << TARGET_PAGE_BITS;
+ int err;
+
+ /*
+ * 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 = 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 = 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) == 16);
+ if (kvm_copy_from_gva(cs, arg, &xatp32, sizeof(xatp32))) {
+ return -EFAULT;
+ }
+ xatp.domid = xatp32.domid;
+ xatp.size = xatp32.size;
+ xatp.space = xatp32.space;
+ xatp.idx = xatp32.idx;
+ xatp.gpfn = xatp32.gpfn;
+ } else {
+ if (kvm_copy_from_gva(cs, arg, &xatp, sizeof(xatp))) {
+ return -EFAULT;
+ }
+ }
+
+ if (xatp.domid != DOMID_SELF && xatp.domid != 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 = do_add_to_physmap(exit, cpu, arg);
+ break;
+
+ default:
+ return false;
+ }
+
+ exit->u.hcall.result = err;
+ return true;
+}
+
static int kvm_xen_soft_reset(void)
{
- /* Nothing to reset... yet. */
+ int err;
+
+ err = xen_overlay_map_shinfo_page(INVALID_GFN);
+ if (err) {
+ return err;
+ }
+
return 0;
}
@@ -262,6 +371,9 @@ 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]);
--
2.35.3
next prev parent reply other threads:[~2023-01-10 12:34 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-10 12:19 [PATCH v6 00/51] Xen support under KVM David Woodhouse
2023-01-10 12:19 ` [PATCH v6 01/51] include: import Xen public headers to include/standard-headers/ David Woodhouse
2023-01-10 12:19 ` [PATCH v6 02/51] xen: add CONFIG_XENFV_MACHINE and CONFIG_XEN_EMU options for Xen emulation David Woodhouse
2023-01-10 12:19 ` [PATCH v6 03/51] xen: Add XEN_DISABLED mode and make it default David Woodhouse
2023-01-10 12:19 ` [PATCH v6 04/51] i386/kvm: Add xen-version KVM accelerator property and init KVM Xen support David Woodhouse
2023-01-10 12:19 ` [PATCH v6 05/51] i386/kvm: handle Xen HVM cpuid leaves David Woodhouse
2023-01-10 12:19 ` [PATCH v6 06/51] i386/hvm: Set Xen vCPU ID in KVM David Woodhouse
2023-01-10 12:19 ` [PATCH v6 07/51] xen-platform: exclude vfio-pci from the PCI platform unplug David Woodhouse
2023-01-10 12:19 ` [PATCH v6 08/51] xen-platform: allow its creation with XEN_EMULATE mode David Woodhouse
2023-01-16 16:20 ` Paul Durrant
2023-01-16 17:56 ` David Woodhouse
2023-01-10 12:20 ` [PATCH v6 09/51] i386/xen: handle guest hypercalls David Woodhouse
2023-01-16 16:24 ` Paul Durrant
2023-01-16 17:57 ` David Woodhouse
2023-01-10 12:20 ` [PATCH v6 10/51] i386/xen: implement HYPERVISOR_xen_version David Woodhouse
2023-01-10 12:20 ` [PATCH v6 11/51] i386/xen: implement HYPERVISOR_sched_op, SCHEDOP_shutdown David Woodhouse
2023-01-16 16:27 ` Paul Durrant
2023-01-10 12:20 ` [PATCH v6 12/51] i386/xen: Implement SCHEDOP_poll and SCHEDOP_yield David Woodhouse
2023-01-16 16:36 ` Paul Durrant
2023-01-10 12:20 ` [PATCH v6 13/51] hw/xen: Add xen_overlay device for emulating shared xenheap pages David Woodhouse
2023-01-16 16:57 ` Paul Durrant
2023-01-10 12:20 ` [PATCH v6 14/51] i386/xen: add pc_machine_kvm_type to initialize XEN_EMULATE mode David Woodhouse
2023-01-16 17:17 ` Paul Durrant
2023-01-16 19:45 ` David Woodhouse
2023-01-10 12:20 ` [PATCH v6 15/51] i386/xen: manage and save/restore Xen guest long_mode setting David Woodhouse
2023-01-16 17:20 ` Paul Durrant
2023-01-10 12:20 ` David Woodhouse [this message]
2023-01-16 17:28 ` [PATCH v6 16/51] i386/xen: implement HYPERVISOR_memory_op Paul Durrant
2023-01-10 12:20 ` [PATCH v6 17/51] i386/xen: implement XENMEM_add_to_physmap_batch David Woodhouse
2023-01-16 17:36 ` Paul Durrant
2023-01-10 12:20 ` [PATCH v6 18/51] i386/xen: implement HYPERVISOR_hvm_op David Woodhouse
2023-01-16 17:39 ` Paul Durrant
2023-01-10 12:20 ` [PATCH v6 19/51] i386/xen: implement HYPERVISOR_vcpu_op David Woodhouse
2023-01-16 17:40 ` Paul Durrant
2023-01-10 12:20 ` [PATCH v6 20/51] i386/xen: handle VCPUOP_register_vcpu_info David Woodhouse
2023-01-16 17:46 ` Paul Durrant
2023-01-10 12:20 ` [PATCH v6 21/51] i386/xen: handle VCPUOP_register_vcpu_time_info David Woodhouse
2023-01-16 17:53 ` Paul Durrant
2023-01-10 12:20 ` [PATCH v6 22/51] i386/xen: handle VCPUOP_register_runstate_memory_area David Woodhouse
2023-01-16 17:56 ` Paul Durrant
2023-01-10 12:20 ` [PATCH v6 23/51] i386/xen: implement HYPERVISOR_event_channel_op David Woodhouse
2023-01-16 17:59 ` Paul Durrant
2023-01-16 19:54 ` David Woodhouse
2023-01-10 12:20 ` [PATCH v6 24/51] i386/xen: implement HVMOP_set_evtchn_upcall_vector David Woodhouse
2023-01-10 12:20 ` [PATCH v6 25/51] i386/xen: implement HVMOP_set_param David Woodhouse
2023-01-16 18:00 ` Paul Durrant
2023-01-10 12:20 ` [PATCH v6 26/51] hw/xen: Add xen_evtchn device for event channel emulation David Woodhouse
2023-01-10 12:20 ` [PATCH v6 27/51] i386/xen: Add support for Xen event channel delivery to vCPU David Woodhouse
2023-01-10 12:20 ` [PATCH v6 28/51] hw/xen: Implement EVTCHNOP_status David Woodhouse
2023-01-10 12:20 ` [PATCH v6 29/51] hw/xen: Implement EVTCHNOP_close David Woodhouse
2023-01-10 12:20 ` [PATCH v6 30/51] hw/xen: Implement EVTCHNOP_unmask David Woodhouse
2023-01-10 12:20 ` [PATCH v6 31/51] hw/xen: Implement EVTCHNOP_bind_virq David Woodhouse
2023-01-10 12:20 ` [PATCH v6 32/51] hw/xen: Implement EVTCHNOP_bind_ipi David Woodhouse
2023-01-10 12:20 ` [PATCH v6 33/51] hw/xen: Implement EVTCHNOP_send David Woodhouse
2023-01-10 12:20 ` [PATCH v6 34/51] hw/xen: Implement EVTCHNOP_alloc_unbound David Woodhouse
2023-01-10 12:20 ` [PATCH v6 35/51] hw/xen: Implement EVTCHNOP_bind_interdomain David Woodhouse
2023-01-10 12:20 ` [PATCH v6 36/51] hw/xen: Implement EVTCHNOP_bind_vcpu David Woodhouse
2023-01-10 12:20 ` [PATCH v6 37/51] hw/xen: Implement EVTCHNOP_reset David Woodhouse
2023-01-10 12:20 ` [PATCH v6 38/51] i386/xen: add monitor commands to test event injection David Woodhouse
2023-01-11 14:28 ` Dr. David Alan Gilbert
2023-01-11 14:57 ` David Woodhouse
2023-01-10 12:20 ` [PATCH v6 39/51] hw/xen: Support HVM_PARAM_CALLBACK_TYPE_GSI callback David Woodhouse
2023-01-10 12:20 ` [PATCH v6 40/51] hw/xen: Support HVM_PARAM_CALLBACK_TYPE_PCI_INTX callback David Woodhouse
2023-01-10 12:20 ` [PATCH v6 41/51] kvm/i386: Add xen-gnttab-max-frames property David Woodhouse
2023-01-10 12:20 ` [PATCH v6 42/51] hw/xen: Add xen_gnttab device for grant table emulation David Woodhouse
2023-01-10 12:20 ` [PATCH v6 43/51] hw/xen: Support mapping grant frames David Woodhouse
2023-01-10 12:20 ` [PATCH v6 44/51] i386/xen: Implement HYPERVISOR_grant_table_op and GNTTABOP_[gs]et_verson David Woodhouse
2023-01-10 12:20 ` [PATCH v6 45/51] hw/xen: Implement GNTTABOP_query_size David Woodhouse
2023-01-10 12:20 ` [PATCH v6 46/51] i386/xen: handle PV timer hypercalls David Woodhouse
2023-01-10 12:20 ` [PATCH v6 47/51] i386/xen: Reserve Xen special pages for console, xenstore rings David Woodhouse
2023-01-10 12:20 ` [PATCH v6 48/51] i386/xen: handle HVMOP_get_param David Woodhouse
2023-01-10 12:20 ` [PATCH v6 49/51] hw/xen: Add backend implementation of interdomain event channel support David Woodhouse
2023-01-10 12:20 ` [PATCH v6 50/51] hw/xen: Add xen_xenstore device for xenstore emulation David Woodhouse
2023-01-10 12:20 ` [PATCH v6 51/51] hw/xen: Add basic ring handling to xenstore David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 00/15] Xen PV backend support for KVM/Xen guests David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 01/15] hw/xen: Add evtchn operations to allow redirection to internal emulation David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 02/15] hw/xen: Add emulated evtchn ops David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 03/15] hw/xen: Add gnttab operations to allow redirection to internal emulation David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 04/15] hw/xen: Pass grant ref to gnttab unmap David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 05/15] hw/xen: Add foreignmem operations to allow redirection to internal emulation David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 06/15] hw/xen: Add xenstore " David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 07/15] hw/xen: Move xenstore_store_pv_console_info to xen_console.c David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 08/15] hw/xen: Use XEN_PAGE_SIZE in PV backend drivers David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 09/15] hw/xen: Rename xen_common.h to xen_native.h David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 10/15] hw/xen: Build PV backend drivers for XENFV_MACHINE David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 11/15] hw/xen: Map guest XENSTORE_PFN grant in emulated Xenstore David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 12/15] hw/xen: Add backend implementation of grant table operations David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 13/15] hw/xen: Implement soft reset for emulated gnttab David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 14/15] hw/xen: Remove old version of Xen headers David Woodhouse
2023-01-10 12:37 ` [RFC PATCH v1 15/15] i386/xen: Initialize XenBus and legacy backends from pc_init1() David Woodhouse
2023-01-10 15:43 ` [RFC PATCH v1 00/15] Xen PV backend support for KVM/Xen guests Joao Martins
2023-01-10 15:47 ` Joao Martins
2023-01-10 16:52 ` David Woodhouse
2023-01-10 17:26 ` Joao Martins
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