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i386/kvm: handle Xen HVM cpuid leaves

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Introduce support for emulating CPUID for Xen HVM guests. It doesn't make
sense to advertise the KVM leaves to a Xen guest, so do Xen unconditionally
when the xen-version machine property is set.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
[dwmw2: Obtain xen_version from KVM property, make it automatic]
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
Joao Martins 2022-12-06 10:48:53 +00:00 • committed by David Woodhouse
parent 61491cf441
commit f66b8a83c5
5 changed files with 91 additions and 6 deletions
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13
target/i386/kvm/xen-emu.h
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@ -12,8 +12,17 @@
#ifndef QEMU_I386_KVM_XEN_EMU_H
#define QEMU_I386_KVM_XEN_EMU_H
#define XEN_HYPERCALL_MSR 0x40000000
#define XEN_HYPERCALL_MSR 0x40000000
#define XEN_HYPERCALL_MSR_HYPERV 0x40000200
int kvm_xen_init(KVMState *s);
#define XEN_CPUID_SIGNATURE 0
#define XEN_CPUID_VENDOR 1
#define XEN_CPUID_HVM_MSR 2
#define XEN_CPUID_TIME 3
#define XEN_CPUID_HVM 4
#define XEN_VERSION(maj, min) ((maj) << 16 | (min))
int kvm_xen_init(KVMState *s, uint32_t hypercall_msr);
#endif /* QEMU_I386_KVM_XEN_EMU_H */