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[PATCH v8 11/58] i386/xen: implement HYPERVISOR_sched_op, SCHEDOP_shutdo
From: |
David Woodhouse |
Subject: |
[PATCH v8 11/58] i386/xen: implement HYPERVISOR_sched_op, SCHEDOP_shutdown |
Date: |
Fri, 20 Jan 2023 13:12:56 +0000 |
From: Joao Martins <joao.m.martins@oracle.com>
It allows to shutdown itself via hypercall with any of the 3 reasons:
1) self-reboot
2) shutdown
3) crash
Implementing SCHEDOP_shutdown sub op let us handle crashes gracefully rather
than leading to triple faults if it remains unimplemented.
In addition, the SHUTDOWN_soft_reset reason is used for kexec, to reset
Xen shared pages and other enlightenments and leave a clean slate for the
new kernel without the hypervisor helpfully writing information at
unexpected addresses.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
[dwmw2: Ditch sched_op_compat which was never available for HVM guests,
Add SCHEDOP_soft_reset]
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
---
include/sysemu/kvm_xen.h | 1 +
target/i386/kvm/trace-events | 1 +
target/i386/kvm/xen-emu.c | 75 ++++++++++++++++++++++++++++++++++++
3 files changed, 77 insertions(+)
diff --git a/include/sysemu/kvm_xen.h b/include/sysemu/kvm_xen.h
index 296533f2d5..5dffcc0542 100644
--- a/include/sysemu/kvm_xen.h
+++ b/include/sysemu/kvm_xen.h
@@ -12,6 +12,7 @@
#ifndef QEMU_SYSEMU_KVM_XEN_H
#define QEMU_SYSEMU_KVM_XEN_H
+int kvm_xen_soft_reset(void);
uint32_t kvm_xen_get_caps(void);
#define kvm_xen_has_cap(cap) (!!(kvm_xen_get_caps() & \
diff --git a/target/i386/kvm/trace-events b/target/i386/kvm/trace-events
index cd6f842b1f..bb732e1da8 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_soft_reset(void) ""
diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 1dea6feb90..d2c70ea180 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -11,14 +11,17 @@
#include "qemu/osdep.h"
#include "qemu/log.h"
+#include "qemu/main-loop.h"
#include "sysemu/kvm_int.h"
#include "sysemu/kvm_xen.h"
#include "kvm/kvm_i386.h"
#include "exec/address-spaces.h"
#include "xen-emu.h"
#include "trace.h"
+#include "sysemu/runstate.h"
#include "standard-headers/xen/version.h"
+#include "standard-headers/xen/sched.h"
static int kvm_gva_rw(CPUState *cs, uint64_t gva, void *_buf, size_t sz,
bool is_write)
@@ -170,6 +173,75 @@ static bool kvm_xen_hcall_xen_version(struct kvm_xen_exit
*exit, X86CPU *cpu,
return true;
}
+int kvm_xen_soft_reset(void)
+{
+ assert(qemu_mutex_iothread_locked());
+
+ trace_kvm_xen_soft_reset();
+
+ /* Nothing to reset... yet. */
+ return 0;
+}
+
+static int schedop_shutdown(CPUState *cs, uint64_t arg)
+{
+ struct sched_shutdown shutdown;
+ int ret = 0;
+
+ /* No need for 32/64 compat handling */
+ qemu_build_assert(sizeof(shutdown) == 4);
+
+ if (kvm_copy_from_gva(cs, arg, &shutdown, sizeof(shutdown))) {
+ return -EFAULT;
+ }
+
+ switch (shutdown.reason) {
+ case SHUTDOWN_crash:
+ cpu_dump_state(cs, stderr, CPU_DUMP_CODE);
+ qemu_system_guest_panicked(NULL);
+ break;
+
+ case SHUTDOWN_reboot:
+ qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
+ break;
+
+ case SHUTDOWN_poweroff:
+ qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
+ break;
+
+ case SHUTDOWN_soft_reset:
+ qemu_mutex_lock_iothread();
+ ret = kvm_xen_soft_reset();
+ qemu_mutex_unlock_iothread();
+ break;
+
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static bool kvm_xen_hcall_sched_op(struct kvm_xen_exit *exit, X86CPU *cpu,
+ int cmd, uint64_t arg)
+{
+ CPUState *cs = CPU(cpu);
+ int err = -ENOSYS;
+
+ switch (cmd) {
+ case SCHEDOP_shutdown:
+ err = schedop_shutdown(cs, arg);
+ break;
+
+ default:
+ return false;
+ }
+
+ exit->u.hcall.result = err;
+ return true;
+}
+
static bool do_kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit)
{
uint16_t code = exit->u.hcall.input;
@@ -180,6 +252,9 @@ static bool do_kvm_xen_handle_exit(X86CPU *cpu, struct
kvm_xen_exit *exit)
}
switch (code) {
+ case __HYPERVISOR_sched_op:
+ return kvm_xen_hcall_sched_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]);
--
2.39.0
- [PATCH v8 06/58] i386/hvm: Set Xen vCPU ID in KVM, (continued)
- [PATCH v8 06/58] i386/hvm: Set Xen vCPU ID in KVM, David Woodhouse, 2023/01/20
- [PATCH v8 33/58] hw/xen: Implement EVTCHNOP_send, David Woodhouse, 2023/01/20
- [PATCH v8 19/58] i386/xen: implement HYPERVISOR_vcpu_op, David Woodhouse, 2023/01/20
- [PATCH v8 03/58] xen: Add XEN_DISABLED mode and make it default, David Woodhouse, 2023/01/20
- [PATCH v8 37/58] hw/xen: Implement EVTCHNOP_reset, David Woodhouse, 2023/01/20
- [PATCH v8 47/58] i386/xen: Reserve Xen special pages for console, xenstore rings, David Woodhouse, 2023/01/20
- [PATCH v8 32/58] hw/xen: Implement EVTCHNOP_bind_ipi, David Woodhouse, 2023/01/20
- [PATCH v8 43/58] hw/xen: Support mapping grant frames, David Woodhouse, 2023/01/20
- [PATCH v8 55/58] hw/xen: Implement emulated PIRQ hypercall support, David Woodhouse, 2023/01/20
- [PATCH v8 42/58] hw/xen: Add xen_gnttab device for grant table emulation, David Woodhouse, 2023/01/20
- [PATCH v8 11/58] i386/xen: implement HYPERVISOR_sched_op, SCHEDOP_shutdown,
David Woodhouse <=
- [PATCH v8 41/58] kvm/i386: Add xen-gnttab-max-frames property, David Woodhouse, 2023/01/20
- [PATCH v8 51/58] hw/xen: Add basic ring handling to xenstore, David Woodhouse, 2023/01/20
- [PATCH v8 26/58] hw/xen: Add xen_evtchn device for event channel emulation, David Woodhouse, 2023/01/20
- [PATCH v8 48/58] i386/xen: handle HVMOP_get_param, David Woodhouse, 2023/01/20
- [PATCH v8 24/58] i386/xen: implement HVMOP_set_evtchn_upcall_vector, David Woodhouse, 2023/01/20
- [PATCH v8 17/58] i386/xen: implement XENMEM_add_to_physmap_batch, David Woodhouse, 2023/01/20
- [PATCH v8 02/58] xen: add CONFIG_XEN_BUS and CONFIG_XEN_EMU options for Xen emulation, David Woodhouse, 2023/01/20
- [PATCH v8 50/58] hw/xen: Add xen_xenstore device for xenstore emulation, David Woodhouse, 2023/01/20
- [PATCH v8 20/58] i386/xen: handle VCPUOP_register_vcpu_info, David Woodhouse, 2023/01/20