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, 1 deletions

diff --git a/target/openrisc/cpu.h b/target/openrisc/cpu.h
index 5f60749705..f16e8b3274 100644
--- a/target/openrisc/cpu.h
+++ b/target/openrisc/cpu.h
@@ -312,7 +312,6 @@ struct ArchCPU {
 
 void cpu_openrisc_list(void);
 void openrisc_cpu_dump_state(CPUState *cpu, FILE *f, int flags);
-hwaddr openrisc_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 int openrisc_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
 int openrisc_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 void openrisc_translate_init(void);
@@ -321,6 +320,8 @@ int print_insn_or1k(bfd_vma addr, disassemble_info *info);
 #define cpu_list cpu_openrisc_list
 
 #ifndef CONFIG_USER_ONLY
+hwaddr openrisc_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
+
 bool openrisc_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
                            MMUAccessType access_type, int mmu_idx,
                            bool probe, uintptr_t retaddr);