From 28b7ae94a21d37f38f7b68a9f40fa521144898a6 Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw@amazon.co.uk>
Date: Fri, 16 Dec 2022 23:40:57 +0000
Subject: i386/xen: Implement HYPERVISOR_grant_table_op and
 GNTTABOP_[gs]et_verson

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
---
 hw/i386/kvm/xen_gnttab.c | 31 +++++++++++++++++++++++++++++++
 hw/i386/kvm/xen_gnttab.h |  5 +++++
 2 files changed, 36 insertions(+)

(limited to 'hw')

diff --git a/hw/i386/kvm/xen_gnttab.c b/hw/i386/kvm/xen_gnttab.c
index 72e87ae..b54a94e 100644
--- a/hw/i386/kvm/xen_gnttab.c
+++ b/hw/i386/kvm/xen_gnttab.c
@@ -180,3 +180,34 @@ int xen_gnttab_map_page(uint64_t idx, uint64_t gfn)
     return 0;
 }
 
+int xen_gnttab_set_version_op(struct gnttab_set_version *set)
+{
+    int ret;
+
+    switch (set->version) {
+    case 1:
+        ret = 0;
+        break;
+
+    case 2:
+        /* Behave as before set_version was introduced. */
+        ret = -ENOSYS;
+        break;
+
+    default:
+        ret = -EINVAL;
+    }
+
+    set->version = 1;
+    return ret;
+}
+
+int xen_gnttab_get_version_op(struct gnttab_get_version *get)
+{
+    if (get->dom != DOMID_SELF && get->dom != xen_domid) {
+        return -ESRCH;
+    }
+
+    get->version = 1;
+    return 0;
+}
diff --git a/hw/i386/kvm/xen_gnttab.h b/hw/i386/kvm/xen_gnttab.h
index a7caa94..7957967 100644
--- a/hw/i386/kvm/xen_gnttab.h
+++ b/hw/i386/kvm/xen_gnttab.h
@@ -15,4 +15,9 @@
 void xen_gnttab_create(void);
 int xen_gnttab_map_page(uint64_t idx, uint64_t gfn);
 
+struct gnttab_set_version;
+struct gnttab_get_version;
+int xen_gnttab_set_version_op(struct gnttab_set_version *set);
+int xen_gnttab_get_version_op(struct gnttab_get_version *get);
+
 #endif /* QEMU_XEN_GNTTAB_H */
-- 
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