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[RFC PATCH v11bis 23/26] hw/xen: Map guest XENSTORE_PFN grant in emulate
From: |
David Woodhouse |
Subject: |
[RFC PATCH v11bis 23/26] hw/xen: Map guest XENSTORE_PFN grant in emulated Xenstore |
Date: |
Thu, 16 Feb 2023 09:44:33 +0000 |
From: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
hw/i386/kvm/xen_xenstore.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/hw/i386/kvm/xen_xenstore.c b/hw/i386/kvm/xen_xenstore.c
index 74729cbb63..a58c89b555 100644
--- a/hw/i386/kvm/xen_xenstore.c
+++ b/hw/i386/kvm/xen_xenstore.c
@@ -21,6 +21,7 @@
#include "hw/sysbus.h"
#include "hw/xen/xen.h"
+#include "hw/xen/xen_backend_ops.h"
#include "xen_overlay.h"
#include "xen_evtchn.h"
#include "xen_xenstore.h"
@@ -34,6 +35,7 @@
#include "hw/xen/interface/io/xs_wire.h"
#include "hw/xen/interface/event_channel.h"
+#include "hw/xen/interface/grant_table.h"
#define TYPE_XEN_XENSTORE "xen-xenstore"
OBJECT_DECLARE_SIMPLE_TYPE(XenXenstoreState, XEN_XENSTORE)
@@ -66,6 +68,9 @@ struct XenXenstoreState {
uint8_t *impl_state;
uint32_t impl_state_size;
+
+ struct xengntdev_handle *gt;
+ void *granted_xs;
};
struct XenXenstoreState *xen_xenstore_singleton;
@@ -1413,6 +1418,17 @@ int xen_xenstore_reset(void)
}
s->be_port = err;
+ /*
+ * We don't actually access the guest's page through the grant, because
+ * this isn't real Xen, and we can just use the page we gave it in the
+ * first place. Map the grant anyway, mostly for cosmetic purposes so
+ * it *looks* like it's in use in the guest-visible grant table.
+ */
+ s->gt = qemu_xen_gnttab_open();
+ uint32_t xs_gntref = GNTTAB_RESERVED_XENSTORE;
+ s->granted_xs = qemu_xen_gnttab_map_refs(s->gt, 1, xen_domid,
+ &xs_gntref, PROT_READ|PROT_WRITE);
+
return 0;
}
--
2.39.0
- [RFC PATCH v11bis 00/26] Emulated XenStore and PV backend support, David Woodhouse, 2023/02/16
- [RFC PATCH v11bis 23/26] hw/xen: Map guest XENSTORE_PFN grant in emulated Xenstore,
David Woodhouse <=
- [RFC PATCH v11bis 18/26] hw/xen: Avoid crash when backend watch fires too early, David Woodhouse, 2023/02/16
- [RFC PATCH v11bis 24/26] hw/xen: Implement soft reset for emulated gnttab, David Woodhouse, 2023/02/16
- [RFC PATCH v11bis 15/26] hw/xen: Use XEN_PAGE_SIZE in PV backend drivers, David Woodhouse, 2023/02/16
- [RFC PATCH v11bis 17/26] hw/xen: Build PV backend drivers for CONFIG_XEN_BUS, David Woodhouse, 2023/02/16
- [RFC PATCH v11bis 25/26] hw/xen: Subsume xen_be_register_common() into xen_be_init(), David Woodhouse, 2023/02/16
- [RFC PATCH v11bis 21/26] hw/xen: Add emulated implementation of grant table operations, David Woodhouse, 2023/02/16
- [RFC PATCH v11bis 19/26] hw/xen: Only advertise ring-page-order for xen-block if gnttab supports it, David Woodhouse, 2023/02/16
- [RFC PATCH v11bis 14/26] hw/xen: Move xenstore_store_pv_console_info to xen_console.c, David Woodhouse, 2023/02/16
- [RFC PATCH v11bis 04/26] hw/xen: Implement XenStore transactions, David Woodhouse, 2023/02/16
- [RFC PATCH v11bis 26/26] i386/xen: Initialize Xen backends from pc_basic_device_init() for emulation, David Woodhouse, 2023/02/16