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i386/xen: implement HVMOP_set_param 

This is the hook for adding the HVM_PARAM_CALLBACK_IRQ parameter in a
subsequent commit.

Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
[dwmw2: Split out from another commit]
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
Ankur Arora 2022-12-06 11:14:07 +00:00 committed by David Woodhouse
parent 105b47fdf2
commit 5dbcd01a8d
1 changed files with 33 additions and 0 deletions
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33
target/i386/kvm/xen-emu.c
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@ -489,6 +489,36 @@ static bool kvm_xen_hcall_memory_op(struct kvm_xen_exit *exit, X86CPU *cpu,
return true;
}
static bool handle_set_param(struct kvm_xen_exit *exit, X86CPU *cpu,
uint64_t arg)
{
CPUState *cs = CPU(cpu);
struct xen_hvm_param hp;
int err = 0;
/* No need for 32/64 compat handling */
qemu_build_assert(sizeof(hp) == 16);
if (kvm_copy_from_gva(cs, arg, &hp, sizeof(hp))) {
err = -EFAULT;
goto out;
}
if (hp.domid != DOMID_SELF && hp.domid != xen_domid) {
err = -ESRCH;
goto out;
}
switch (hp.index) {
default:
return false;
}
out:
exit->u.hcall.result = err;
return true;
}
static int kvm_xen_hcall_evtchn_upcall_vector(struct kvm_xen_exit *exit,
X86CPU *cpu, uint64_t arg)
{
@ -530,6 +560,9 @@ static bool kvm_xen_hcall_hvm_op(struct kvm_xen_exit *exit, X86CPU *cpu,
ret = -ENOSYS;
break;
case HVMOP_set_param:
return handle_set_param(exit, cpu, arg);
default:
return false;
}