f66b8a83c5
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>
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/*
|
|
* Xen HVM emulation support in KVM
|
|
*
|
|
* Copyright © 2019 Oracle and/or its affiliates. All rights reserved.
|
|
* Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "sysemu/kvm_int.h"
|
|
#include "sysemu/kvm_xen.h"
|
|
#include "kvm/kvm_i386.h"
|
|
#include "xen-emu.h"
|
|
|
|
int kvm_xen_init(KVMState *s, uint32_t hypercall_msr)
|
|
{
|
|
const int required_caps = KVM_XEN_HVM_CONFIG_HYPERCALL_MSR |
|
|
KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL | KVM_XEN_HVM_CONFIG_SHARED_INFO;
|
|
struct kvm_xen_hvm_config cfg = {
|
|
.msr = hypercall_msr,
|
|
.flags = KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL,
|
|
};
|
|
int xen_caps, ret;
|
|
|
|
xen_caps = kvm_check_extension(s, KVM_CAP_XEN_HVM);
|
|
if (required_caps & ~xen_caps) {
|
|
error_report("kvm: Xen HVM guest support not present or insufficient");
|
|
return -ENOSYS;
|
|
}
|
|
|
|
if (xen_caps & KVM_XEN_HVM_CONFIG_EVTCHN_SEND) {
|
|
struct kvm_xen_hvm_attr ha = {
|
|
.type = KVM_XEN_ATTR_TYPE_XEN_VERSION,
|
|
.u.xen_version = s->xen_version,
|
|
};
|
|
(void)kvm_vm_ioctl(s, KVM_XEN_HVM_SET_ATTR, &ha);
|
|
|
|
cfg.flags |= KVM_XEN_HVM_CONFIG_EVTCHN_SEND;
|
|
}
|
|
|
|
ret = kvm_vm_ioctl(s, KVM_XEN_HVM_CONFIG, &cfg);
|
|
if (ret < 0) {
|
|
error_report("kvm: Failed to enable Xen HVM support: %s",
|
|
strerror(-ret));
|
|
return ret;
|
|
}
|
|
|
|
s->xen_caps = xen_caps;
|
|
return 0;
|
|
}
|
|
|
|
uint32_t kvm_xen_get_caps(void)
|
|
{
|
|
return kvm_state->xen_caps;
|
|
}
|