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, 2 insertions, 4 deletions

diff --git a/include/hw/acpi/ich9.h b/include/hw/acpi/ich9.h
index d41866a229..57a542c4b8 100644
--- a/include/hw/acpi/ich9.h
+++ b/include/hw/acpi/ich9.h
@@ -64,7 +64,7 @@ typedef struct ICH9LPCPMRegs {
     uint8_t disable_s3;
     uint8_t disable_s4;
     uint8_t s4_val;
-    uint8_t smm_enabled;
+    bool smm_enabled;
     bool smm_compat;
     bool enable_tco;
     TCOIORegs tco_regs;
@@ -72,9 +72,7 @@ typedef struct ICH9LPCPMRegs {
 
 #define ACPI_PM_PROP_TCO_ENABLED "enable_tco"
 
-void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm,
-                  bool smm_enabled,
-                  qemu_irq sci_irq);
+void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm, qemu_irq sci_irq);
 
 void ich9_pm_iospace_update(ICH9LPCPMRegs *pm, uint32_t pm_io_base);
 extern const VMStateDescription vmstate_ich9_pm;