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[PATCH v7 48/51] i386/xen: handle HVMOP_get_param
From: |
David Woodhouse |
Subject: |
[PATCH v7 48/51] i386/xen: handle HVMOP_get_param |
Date: |
Mon, 16 Jan 2023 21:58:02 +0000 |
From: Joao Martins <joao.m.martins@oracle.com>
Which is used to fetch xenstore PFN and port to be used
by the guest. This is preallocated by the toolstack when
guest will just read those and use it straight away.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
target/i386/kvm/xen-emu.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 0110ef55c7..c55d2e16a3 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -744,6 +744,42 @@ out:
return true;
}
+static bool handle_get_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) {
+ case HVM_PARAM_STORE_PFN:
+ hp.value = XEN_SPECIAL_PFN(XENSTORE);
+ break;
+ default:
+ return false;
+ }
+
+ if (kvm_copy_to_gva(cs, arg, &hp, sizeof(hp))) {
+ err = -EFAULT;
+ }
+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)
{
@@ -788,6 +824,9 @@ static bool kvm_xen_hcall_hvm_op(struct kvm_xen_exit *exit,
X86CPU *cpu,
case HVMOP_set_param:
return handle_set_param(exit, cpu, arg);
+ case HVMOP_get_param:
+ return handle_get_param(exit, cpu, arg);
+
default:
return false;
}
--
2.39.0
- [PATCH v7 05/51] i386/kvm: handle Xen HVM cpuid leaves, (continued)
- [PATCH v7 05/51] i386/kvm: handle Xen HVM cpuid leaves, David Woodhouse, 2023/01/16
- [PATCH v7 39/51] hw/xen: Support HVM_PARAM_CALLBACK_TYPE_GSI callback, David Woodhouse, 2023/01/16
- [PATCH v7 47/51] i386/xen: Reserve Xen special pages for console, xenstore rings, David Woodhouse, 2023/01/16
- [PATCH v7 30/51] hw/xen: Implement EVTCHNOP_unmask, David Woodhouse, 2023/01/16
- [PATCH v7 17/51] i386/xen: implement XENMEM_add_to_physmap_batch, David Woodhouse, 2023/01/16
- [PATCH v7 12/51] i386/xen: Implement SCHEDOP_poll and SCHEDOP_yield, David Woodhouse, 2023/01/16
- [PATCH v7 21/51] i386/xen: handle VCPUOP_register_vcpu_time_info, David Woodhouse, 2023/01/16
- [PATCH v7 11/51] i386/xen: implement HYPERVISOR_sched_op, SCHEDOP_shutdown, David Woodhouse, 2023/01/16
- [PATCH v7 13/51] hw/xen: Add xen_overlay device for emulating shared xenheap pages, David Woodhouse, 2023/01/16
- [PATCH v7 44/51] i386/xen: Implement HYPERVISOR_grant_table_op and GNTTABOP_[gs]et_verson, David Woodhouse, 2023/01/16
- [PATCH v7 48/51] i386/xen: handle HVMOP_get_param,
David Woodhouse <=
- [PATCH v7 34/51] hw/xen: Implement EVTCHNOP_alloc_unbound, David Woodhouse, 2023/01/16
- [PATCH v7 10/51] i386/xen: implement HYPERVISOR_xen_version, David Woodhouse, 2023/01/16
- [PATCH v7 46/51] i386/xen: handle PV timer hypercalls, David Woodhouse, 2023/01/16
- [PATCH v7 27/51] i386/xen: Add support for Xen event channel delivery to vCPU, David Woodhouse, 2023/01/16
- Re: [PATCH v7 27/51] i386/xen: Add support for Xen event channel delivery to vCPU, Paul Durrant, 2023/01/17
- [PATCH v7 03/51] xen: Add XEN_DISABLED mode and make it default, David Woodhouse, 2023/01/16
- [PATCH v7 14/51] i386/xen: add pc_machine_kvm_type to initialize XEN_EMULATE mode, David Woodhouse, 2023/01/16