[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[RFC PATCH v1 23/25] hw/xen: Map guest XENSTORE_PFN grant in emulated Xe
From: |
David Woodhouse |
Subject: |
[RFC PATCH v1 23/25] hw/xen: Map guest XENSTORE_PFN grant in emulated Xenstore |
Date: |
Thu, 2 Mar 2023 15:34:33 +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 028f80499e..f9b7387024 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;
@@ -1452,6 +1457,17 @@ 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
- Re: [RFC PATCH v1 09/25] hw/xen: Add evtchn operations to allow redirection to internal emulation, (continued)
- [RFC PATCH v1 16/25] hw/xen: Rename xen_common.h to xen_native.h, David Woodhouse, 2023/03/02
- [RFC PATCH v1 19/25] hw/xen: Only advertise ring-page-order for xen-block if gnttab supports it, David Woodhouse, 2023/03/02
- [RFC PATCH v1 21/25] hw/xen: Add emulated implementation of grant table operations, David Woodhouse, 2023/03/02
- [RFC PATCH v1 10/25] hw/xen: Add gnttab operations to allow redirection to internal emulation, David Woodhouse, 2023/03/02
- [RFC PATCH v1 23/25] hw/xen: Map guest XENSTORE_PFN grant in emulated Xenstore,
David Woodhouse <=
- [RFC PATCH v1 25/25] i386/xen: Initialize Xen backends from pc_basic_device_init() for emulation, David Woodhouse, 2023/03/02
- [RFC PATCH v1 04/25] hw/xen: Implement XenStore transactions, David Woodhouse, 2023/03/02
- [RFC PATCH v1 06/25] hw/xen: Implement XenStore permissions, David Woodhouse, 2023/03/02
- [RFC PATCH v1 24/25] hw/xen: Implement soft reset for emulated gnttab, David Woodhouse, 2023/03/02
- [RFC PATCH v1 12/25] hw/xen: Add foreignmem operations to allow redirection to internal emulation, David Woodhouse, 2023/03/02