Merge branch 'xenfv-kvm-15' of git://git.infradead.org/users/dwmw2/qemu into HEAD

This adds support for emulating Xen under Linux/KVM, based on kernel
patches which have been present since Linux v5.12. As with the kernel
support, it's derived from work started by João Martins of Oracle in
2018.

This series just adds the basic platform support — CPUID, hypercalls,
event channels, a stub of XenStore.

A full single-tenant internal implementation of XenStore, and patches
to make QEMU's Xen PV drivers work with this Xen emulation, are waiting
in the wings to be submitted in a follow-on patch series.

As noted in the documentation, it's enabled by setting the xen-version
property on the KVM accelerator, e.g.:

 qemu-system-x86_64 -serial mon:stdio -M q35 -display none -m 1G -smp 2 \
    -accel kvm,xen-version=0x4000e,kernel-irqchip=split \
    -kernel vmlinuz-6.0.7-301.fc37.x86_64 \
    -append "console=ttyS0 root=/dev/sda1" \
    -drive file=/var/lib/libvirt/images/fedora28.qcow2,if=none,id=disk \
    -device ahci,id=ahci -device ide-hd,drive=disk,bus=ahci.0

Even before this was merged, we've already been using it to find and fix
bugs in the Linux kernel Xen guest support:

https://lore.kernel.org/all/4bffa69a949bfdc92c4a18e5a1c3cbb3b94a0d32.camel@infradead.org/
https://lore.kernel.org/all/871qnunycr.ffs@tglx/

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 12 insertions, 17 deletions

diff --git a/include/hw/ide/internal.h b/include/hw/ide/internal.h
index fc0aa81a88..d9f1f77dd5 100644
--- a/include/hw/ide/internal.h
+++ b/include/hw/ide/internal.h
@@ -7,13 +7,10 @@
  * non-internal declarations are in hw/ide.h
  */
 
-#include "qapi/qapi-types-run-state.h"
 #include "hw/ide.h"
-#include "hw/irq.h"
-#include "hw/isa/isa.h"
 #include "sysemu/dma.h"
 #include "hw/block/block.h"
-#include "scsi/constants.h"
+#include "exec/ioport.h"
 
 /* debug IDE devices */
 #define USE_DMA_CDROM
@@ -491,7 +488,7 @@ struct IDEBus {
     IDEDMA *dma;
     uint8_t unit;
     uint8_t cmd;
-    qemu_irq irq;
+    qemu_irq irq; /* bus output */
 
     int error_status;
     uint8_t retry_unit;
@@ -569,18 +566,11 @@ static inline uint8_t ide_dma_cmd_to_retry(uint8_t dma_cmd)
     return 0;
 }
 
-static inline IDEState *idebus_active_if(IDEBus *bus)
+static inline IDEState *ide_bus_active_if(IDEBus *bus)
 {
     return bus->ifs + bus->unit;
 }
 
-static inline void ide_set_irq(IDEBus *bus)
-{
-    if (!(bus->cmd & IDE_CTRL_DISABLE_IRQ)) {
-        qemu_irq_raise(bus->irq);
-    }
-}
-
 /* hw/ide/core.c */
 extern const VMStateDescription vmstate_ide_bus;
 
@@ -626,12 +616,13 @@ int ide_init_drive(IDEState *s, BlockBackend *blk, IDEDriveKind kind,
                    uint64_t wwn,
                    uint32_t cylinders, uint32_t heads, uint32_t secs,
                    int chs_trans, Error **errp);
-void ide_init2(IDEBus *bus, qemu_irq irq);
 void ide_exit(IDEState *s);
+void ide_bus_init_output_irq(IDEBus *bus, qemu_irq irq_out);
 int ide_init_ioport(IDEBus *bus, ISADevice *isa, int iobase, int iobase2);
-void ide_register_restart_cb(IDEBus *bus);
+void ide_bus_set_irq(IDEBus *bus);
+void ide_bus_register_restart_cb(IDEBus *bus);
 
-void ide_exec_cmd(IDEBus *bus, uint32_t val);
+void ide_bus_exec_cmd(IDEBus *bus, uint32_t val);
 
 void ide_transfer_start(IDEState *s, uint8_t *buf, int size,
                         EndTransferFunc *end_transfer_func);
@@ -654,7 +645,11 @@ void ide_atapi_cmd_reply_end(IDEState *s);
 /* hw/ide/qdev.c */
 void ide_bus_init(IDEBus *idebus, size_t idebus_size, DeviceState *dev,
                   int bus_id, int max_units);
-IDEDevice *ide_create_drive(IDEBus *bus, int unit, DriveInfo *drive);
+IDEDevice *ide_bus_create_drive(IDEBus *bus, int unit, DriveInfo *drive);
+
+int ide_get_geometry(BusState *bus, int unit,
+                     int16_t *cyls, int8_t *heads, int8_t *secs);
+int ide_get_bios_chs_trans(BusState *bus, int unit);
 
 int ide_handle_rw_error(IDEState *s, int error, int op);