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qemu-kvm/kvm-s390x-s390-virtio-hcall-remove-hypercall-registratio.patch
Jon Maloy eace179c9a * Mon Apr 14 2025 Jon Maloy <jmaloy@redhat.com> - 9.1.0-18 
- kvm-virtio-kconfig-memory-devices-are-PCI-only.patch [RHEL-72977]
- kvm-hw-s390-ccw-device-Convert-to-three-phase-reset.patch [RHEL-72977]
- kvm-hw-s390-virtio-ccw-Convert-to-three-phase-reset.patch [RHEL-72977]
- kvm-target-s390-Convert-CPU-to-Resettable-interface.patch [RHEL-72977]
- kvm-reset-Use-ResetType-for-qemu_devices_reset-and-Machi.patch [RHEL-72977]
- kvm-reset-Add-RESET_TYPE_WAKEUP.patch [RHEL-72977]
- kvm-virtio-mem-Use-new-Resettable-framework-instead-of-L.patch [RHEL-72977]
- kvm-virtio-mem-Add-support-for-suspend-wake-up-with-plug.patch [RHEL-72977]
- kvm-virtio-mem-unplug-memory-only-during-system-resets-n.patch [RHEL-72977]
- kvm-s390x-s390-virtio-ccw-don-t-crash-on-weird-RAM-sizes.patch [RHEL-72977]
- kvm-s390x-s390-virtio-hcall-remove-hypercall-registratio.patch [RHEL-72977]
- kvm-s390x-s390-virtio-hcall-prepare-for-more-diag500-hyp.patch [RHEL-72977]
- kvm-s390x-rename-s390-virtio-hcall-to-s390-hypercall.patch [RHEL-72977]
- kvm-s390x-s390-virtio-ccw-move-setting-the-maximum-guest.patch [RHEL-72977]
- kvm-s390x-introduce-s390_get_memory_limit.patch [RHEL-72977]
- kvm-s390x-s390-hypercall-introduce-DIAG500-STORAGE_LIMIT.patch [RHEL-72977]
- kvm-s390x-s390-stattrib-kvm-prepare-for-memory-devices-a.patch [RHEL-72977]
- kvm-s390x-s390-skeys-prepare-for-memory-devices.patch [RHEL-72977]
- kvm-s390x-s390-virtio-ccw-prepare-for-memory-devices.patch [RHEL-72977]
- kvm-s390x-pv-prepare-for-memory-devices.patch [RHEL-72977]
- kvm-s390x-remember-the-maximum-page-size.patch [RHEL-72977]
- kvm-s390x-virtio-ccw-add-support-for-virtio-based-memory.patch [RHEL-72977]
- kvm-s390x-virtio-mem-support.patch [RHEL-72977]
- kvm-hw-virtio-Also-include-md-stubs-in-case-CONFIG_VIRTI.patch [RHEL-72977]
- kvm-virtio-mem-don-t-warn-about-THP-sizes-on-a-kernel-wi.patch [RHEL-72977]
- kvm-redhat-Enable-virtio-mem-on-s390x.patch [RHEL-72977]
- Resolves: RHEL-72977
  ([IBM 9.7 FEAT] KVM: Enable virtio-mem support - qemu part)
2025-04-14 18:57:58 -04:00

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From 16ccb16d393a3e63936dc993c30c67fdecb1f120 Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david@redhat.com>
Date: Thu, 19 Dec 2024 15:41:03 +0100
Subject: [PATCH 11/26] s390x/s390-virtio-hcall: remove hypercall registration
mechanism
RH-Author: Thomas Huth <thuth@redhat.com>
RH-MergeRequest: 351: Enable virtio-mem support on s390x
RH-Jira: RHEL-72977
RH-Acked-by: David Hildenbrand <david@redhat.com>
RH-Acked-by: Juraj Marcin <None>
RH-Commit: [11/26] 5e8d2720fe9fd6e6e24487d71988821f1cf27f17 (thuth/qemu-kvm-cs)
Nowadays, we only have a single machine type in QEMU, everything is based
on virtio-ccw and the traditional virtio machine does no longer exist. No
need to dynamically register diag500 handlers. Move the two existing
handlers into s390-virtio-hcall.c.
Message-ID: <20241219144115.2820241-3-david@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
(cherry picked from commit 4be0fce498d0a08f18b3a9accdb9ded79484d30a)
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
hw/s390x/meson.build | 6 ++--
hw/s390x/s390-virtio-ccw.c | 58 ------------------------------
hw/s390x/s390-virtio-hcall.c | 65 +++++++++++++++++++++++++---------
hw/s390x/s390-virtio-hcall.h | 2 --
target/s390x/kvm/kvm.c | 5 ++-
target/s390x/tcg/misc_helper.c | 3 ++
6 files changed, 60 insertions(+), 79 deletions(-)
diff --git a/hw/s390x/meson.build b/hw/s390x/meson.build
index 482fd13420..d6c8c33915 100644
--- a/hw/s390x/meson.build
+++ b/hw/s390x/meson.build
@@ -12,7 +12,6 @@ s390x_ss.add(files(
's390-pci-inst.c',
's390-skeys.c',
's390-stattrib.c',
- 's390-virtio-hcall.c',
'sclp.c',
'sclpcpu.c',
'sclpquiesce.c',
@@ -28,7 +27,10 @@ s390x_ss.add(when: 'CONFIG_KVM', if_true: files(
s390x_ss.add(when: 'CONFIG_TCG', if_true: files(
'tod-tcg.c',
))
-s390x_ss.add(when: 'CONFIG_S390_CCW_VIRTIO', if_true: files('s390-virtio-ccw.c'))
+s390x_ss.add(when: 'CONFIG_S390_CCW_VIRTIO', if_true: files(
+ 's390-virtio-ccw.c',
+ 's390-virtio-hcall.c',
+))
s390x_ss.add(when: 'CONFIG_TERMINAL3270', if_true: files('3270-ccw.c'))
s390x_ss.add(when: 'CONFIG_VFIO', if_true: files('s390-pci-vfio.c'))
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 82ded9666c..d47e99028e 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -16,11 +16,8 @@
#include "exec/ram_addr.h"
#include "exec/confidential-guest-support.h"
#include "hw/boards.h"
-#include "hw/s390x/s390-virtio-hcall.h"
#include "hw/s390x/sclp.h"
#include "hw/s390x/s390_flic.h"
-#include "hw/s390x/ioinst.h"
-#include "hw/s390x/css.h"
#include "virtio-ccw.h"
#include "qemu/config-file.h"
#include "qemu/ctype.h"
@@ -124,58 +121,6 @@ static void subsystem_reset(void)
}
}
-static int virtio_ccw_hcall_notify(const uint64_t *args)
-{
- uint64_t subch_id = args[0];
- uint64_t data = args[1];
- SubchDev *sch;
- VirtIODevice *vdev;
- int cssid, ssid, schid, m;
- uint16_t vq_idx = data;
-
- if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) {
- return -EINVAL;
- }
- sch = css_find_subch(m, cssid, ssid, schid);
- if (!sch || !css_subch_visible(sch)) {
- return -EINVAL;
- }
-
- vdev = virtio_ccw_get_vdev(sch);
- if (vq_idx >= VIRTIO_QUEUE_MAX || !virtio_queue_get_num(vdev, vq_idx)) {
- return -EINVAL;
- }
-
- if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
- virtio_queue_set_shadow_avail_idx(virtio_get_queue(vdev, vq_idx),
- (data >> 16) & 0xFFFF);
- }
-
- virtio_queue_notify(vdev, vq_idx);
- return 0;
-}
-
-static int virtio_ccw_hcall_early_printk(const uint64_t *args)
-{
- uint64_t mem = args[0];
- MachineState *ms = MACHINE(qdev_get_machine());
-
- if (mem < ms->ram_size) {
- /* Early printk */
- return 0;
- }
- return -EINVAL;
-}
-
-static void virtio_ccw_register_hcalls(void)
-{
- s390_register_virtio_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY,
- virtio_ccw_hcall_notify);
- /* Tolerate early printk. */
- s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
- virtio_ccw_hcall_early_printk);
-}
-
static void s390_memory_init(MemoryRegion *ram)
{
MemoryRegion *sysmem = get_system_memory();
@@ -296,9 +241,6 @@ static void ccw_init(MachineState *machine)
OBJECT(dev));
sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
- /* register hypercalls */
- virtio_ccw_register_hcalls();
-
s390_enable_css_support(s390_cpu_addr2state(0));
ret = css_create_css_image(VIRTUAL_CSSID, true);
diff --git a/hw/s390x/s390-virtio-hcall.c b/hw/s390x/s390-virtio-hcall.c
index ec7cf8beb3..ca49e3cd22 100644
--- a/hw/s390x/s390-virtio-hcall.c
+++ b/hw/s390x/s390-virtio-hcall.c
@@ -11,31 +11,64 @@
#include "qemu/osdep.h"
#include "cpu.h"
+#include "hw/boards.h"
#include "hw/s390x/s390-virtio-hcall.h"
+#include "hw/s390x/ioinst.h"
+#include "hw/s390x/css.h"
+#include "virtio-ccw.h"
-#define MAX_DIAG_SUBCODES 255
+static int handle_virtio_notify(uint64_t mem)
+{
+ MachineState *ms = MACHINE(qdev_get_machine());
-static s390_virtio_fn s390_diag500_table[MAX_DIAG_SUBCODES];
+ if (mem < ms->ram_size) {
+ /* Early printk */
+ return 0;
+ }
+ return -EINVAL;
+}
-void s390_register_virtio_hypercall(uint64_t code, s390_virtio_fn fn)
+static int handle_virtio_ccw_notify(uint64_t subch_id, uint64_t data)
{
- assert(code < MAX_DIAG_SUBCODES);
- assert(!s390_diag500_table[code]);
+ SubchDev *sch;
+ VirtIODevice *vdev;
+ int cssid, ssid, schid, m;
+ uint16_t vq_idx = data;
+
+ if (ioinst_disassemble_sch_ident(subch_id, &m, &cssid, &ssid, &schid)) {
+ return -EINVAL;
+ }
+ sch = css_find_subch(m, cssid, ssid, schid);
+ if (!sch || !css_subch_visible(sch)) {
+ return -EINVAL;
+ }
- s390_diag500_table[code] = fn;
+ vdev = virtio_ccw_get_vdev(sch);
+ if (vq_idx >= VIRTIO_QUEUE_MAX || !virtio_queue_get_num(vdev, vq_idx)) {
+ return -EINVAL;
+ }
+
+ if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) {
+ virtio_queue_set_shadow_avail_idx(virtio_get_queue(vdev, vq_idx),
+ (data >> 16) & 0xFFFF);
+ }
+
+ virtio_queue_notify(vdev, vq_idx);
+ return 0;
}
int s390_virtio_hypercall(CPUS390XState *env)
{
- s390_virtio_fn fn;
-
- if (env->regs[1] < MAX_DIAG_SUBCODES) {
- fn = s390_diag500_table[env->regs[1]];
- if (fn) {
- env->regs[2] = fn(&env->regs[2]);
- return 0;
- }
- }
+ const uint64_t subcode = env->regs[1];
- return -EINVAL;
+ switch (subcode) {
+ case KVM_S390_VIRTIO_NOTIFY:
+ env->regs[2] = handle_virtio_notify(env->regs[2]);
+ return 0;
+ case KVM_S390_VIRTIO_CCW_NOTIFY:
+ env->regs[2] = handle_virtio_ccw_notify(env->regs[2], env->regs[3]);
+ return 0;
+ default:
+ return -EINVAL;
+ }
}
diff --git a/hw/s390x/s390-virtio-hcall.h b/hw/s390x/s390-virtio-hcall.h
index 3ae6d6ae3a..3d9fe147d2 100644
--- a/hw/s390x/s390-virtio-hcall.h
+++ b/hw/s390x/s390-virtio-hcall.h
@@ -18,8 +18,6 @@
/* The only thing that we need from the old kvm_virtio.h file */
#define KVM_S390_VIRTIO_NOTIFY 0
-typedef int (*s390_virtio_fn)(const uint64_t *args);
-void s390_register_virtio_hypercall(uint64_t code, s390_virtio_fn fn);
int s390_virtio_hypercall(CPUS390XState *env);
#endif /* HW_S390_VIRTIO_HCALL_H */
diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
index 7a0ca5570f..5947dda829 100644
--- a/target/s390x/kvm/kvm.c
+++ b/target/s390x/kvm/kvm.c
@@ -51,6 +51,7 @@
#include "hw/s390x/s390-virtio-ccw.h"
#include "hw/s390x/s390-virtio-hcall.h"
#include "target/s390x/kvm/pv.h"
+#include CONFIG_DEVICES
#define kvm_vm_check_mem_attr(s, attr) \
kvm_vm_check_attr(s, KVM_S390_VM_MEM_CTRL, attr)
@@ -1494,9 +1495,11 @@ static int handle_e3(S390CPU *cpu, struct kvm_run *run, uint8_t ipbl)
static int handle_hypercall(S390CPU *cpu, struct kvm_run *run)
{
CPUS390XState *env = &cpu->env;
- int ret;
+ int ret = -EINVAL;
+#ifdef CONFIG_S390_CCW_VIRTIO
ret = s390_virtio_hypercall(env);
+#endif /* CONFIG_S390_CCW_VIRTIO */
if (ret == -EINVAL) {
kvm_s390_program_interrupt(cpu, PGM_SPECIFICATION);
return 0;
diff --git a/target/s390x/tcg/misc_helper.c b/target/s390x/tcg/misc_helper.c
index 303f86d363..f44136a568 100644
--- a/target/s390x/tcg/misc_helper.c
+++ b/target/s390x/tcg/misc_helper.c
@@ -43,6 +43,7 @@
#include "hw/s390x/s390-pci-inst.h"
#include "hw/boards.h"
#include "hw/s390x/tod.h"
+#include CONFIG_DEVICES
#endif
/* #define DEBUG_HELPER */
@@ -116,12 +117,14 @@ void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint32_t r3, uint32_t num)
uint64_t r;
switch (num) {
+#ifdef CONFIG_S390_CCW_VIRTIO
case 0x500:
/* KVM hypercall */
bql_lock();
r = s390_virtio_hypercall(env);
bql_unlock();
break;
+#endif /* CONFIG_S390_CCW_VIRTIO */
case 0x44:
/* yield */
r = 0;
--
2.48.1
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