Mailing List Archive

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>

This patch makes possible to forward Guest MMIO accesses
to a device emulator on Arm and enables that support for
Arm64.

Also update XSM code a bit to let DM op be used on Arm.
New arch DM op will be introduced in the follow-up patch.

Please note, at the moment build on Arm32 is broken
(see cmpxchg usage in hvm_send_buffered_ioreq()) if someone
wants to enable CONFIG_IOREQ_SERVER due to the lack of
cmpxchg_64 support on Arm32.

Please note, this is a split/cleanup of Julien's PoC:
"Add support for Guest IO forwarding to a device emulator"

Signed-off-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
---
tools/libxc/xc_dom_arm.c | 25 +++++++---
xen/arch/arm/Kconfig | 1 +
xen/arch/arm/Makefile | 2 +
xen/arch/arm/dm.c | 34 +++++++++++++
xen/arch/arm/domain.c | 9 ++++
xen/arch/arm/hvm.c | 46 +++++++++++++++++-
xen/arch/arm/io.c | 67 +++++++++++++++++++++++++-
xen/arch/arm/ioreq.c | 86 +++++++++++++++++++++++++++++++++
xen/arch/arm/traps.c | 17 +++++++
xen/common/memory.c | 5 +-
xen/include/asm-arm/domain.h | 80 +++++++++++++++++++++++++++++++
xen/include/asm-arm/hvm/ioreq.h | 103 ++++++++++++++++++++++++++++++++++++++++
xen/include/asm-arm/mmio.h | 1 +
xen/include/asm-arm/p2m.h | 7 +--
xen/include/xsm/dummy.h | 4 +-
xen/include/xsm/xsm.h | 6 +--
xen/xsm/dummy.c | 2 +-
xen/xsm/flask/hooks.c | 5 +-
18 files changed, 476 insertions(+), 24 deletions(-)
create mode 100644 xen/arch/arm/dm.c
create mode 100644 xen/arch/arm/ioreq.c
create mode 100644 xen/include/asm-arm/hvm/ioreq.h

diff --git a/tools/libxc/xc_dom_arm.c b/tools/libxc/xc_dom_arm.c
index 931404c..b5fc066 100644
--- a/tools/libxc/xc_dom_arm.c
+++ b/tools/libxc/xc_dom_arm.c
@@ -26,11 +26,19 @@
#include "xg_private.h"
#include "xc_dom.h"

-#define NR_MAGIC_PAGES 4
+
#define CONSOLE_PFN_OFFSET 0
#define XENSTORE_PFN_OFFSET 1
#define MEMACCESS_PFN_OFFSET 2
#define VUART_PFN_OFFSET 3
+#define IOREQ_SERVER_PFN_OFFSET 4
+
+#define NR_IOREQ_SERVER_PAGES 8
+#define NR_MAGIC_PAGES (4 + NR_IOREQ_SERVER_PAGES)
+
+#define GUEST_MAGIC_BASE_PFN (GUEST_MAGIC_BASE >> XC_PAGE_SHIFT)
+
+#define special_pfn(x) (GUEST_MAGIC_BASE_PFN + (x))

#define LPAE_SHIFT 9

@@ -51,7 +59,7 @@ const char *xc_domain_get_native_protocol(xc_interface *xch,
static int alloc_magic_pages(struct xc_dom_image *dom)
{
int rc, i;
- const xen_pfn_t base = GUEST_MAGIC_BASE >> XC_PAGE_SHIFT;
+ const xen_pfn_t base = special_pfn(0);
xen_pfn_t p2m[NR_MAGIC_PAGES];

BUILD_BUG_ON(NR_MAGIC_PAGES > GUEST_MAGIC_SIZE >> XC_PAGE_SHIFT);
@@ -71,10 +79,9 @@ static int alloc_magic_pages(struct xc_dom_image *dom)
dom->xenstore_pfn = base + XENSTORE_PFN_OFFSET;
dom->vuart_gfn = base + VUART_PFN_OFFSET;

- xc_clear_domain_page(dom->xch, dom->guest_domid, dom->console_pfn);
- xc_clear_domain_page(dom->xch, dom->guest_domid, dom->xenstore_pfn);
- xc_clear_domain_page(dom->xch, dom->guest_domid, base + MEMACCESS_PFN_OFFSET);
- xc_clear_domain_page(dom->xch, dom->guest_domid, dom->vuart_gfn);
+ /* XXX: Check return */
+ xc_clear_domain_pages(dom->xch, dom->guest_domid, special_pfn(0),
+ NR_MAGIC_PAGES);

xc_hvm_param_set(dom->xch, dom->guest_domid, HVM_PARAM_CONSOLE_PFN,
dom->console_pfn);
@@ -88,6 +95,12 @@ static int alloc_magic_pages(struct xc_dom_image *dom)
xc_hvm_param_set(dom->xch, dom->guest_domid, HVM_PARAM_STORE_EVTCHN,
dom->xenstore_evtchn);

+ /* Tell the domain where the pages are and how many there are. */
+ xc_hvm_param_set(dom->xch, dom->guest_domid, HVM_PARAM_IOREQ_SERVER_PFN,
+ special_pfn(IOREQ_SERVER_PFN_OFFSET));
+ xc_hvm_param_set(dom->xch, dom->guest_domid, HVM_PARAM_NR_IOREQ_SERVER_PAGES,
+ NR_IOREQ_SERVER_PAGES);
+
return 0;
}

diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index 2777388..6b8a969 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -13,6 +13,7 @@ config ARM_64
def_bool y
depends on 64BIT
select HAS_FAST_MULTIPLY
+ select IOREQ_SERVER

config ARM
def_bool y
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 7e82b21..617fa3e 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -13,6 +13,7 @@ obj-y += cpuerrata.o
obj-y += cpufeature.o
obj-y += decode.o
obj-y += device.o
+obj-$(CONFIG_IOREQ_SERVER) += dm.o
obj-y += domain.o
obj-y += domain_build.init.o
obj-y += domctl.o
@@ -27,6 +28,7 @@ obj-y += guest_atomics.o
obj-y += guest_walk.o
obj-y += hvm.o
obj-y += io.o
+obj-$(CONFIG_IOREQ_SERVER) += ioreq.o
obj-y += irq.o
obj-y += kernel.init.o
obj-$(CONFIG_LIVEPATCH) += livepatch.o
diff --git a/xen/arch/arm/dm.c b/xen/arch/arm/dm.c
new file mode 100644
index 0000000..2437099
--- /dev/null
+++ b/xen/arch/arm/dm.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2019 Arm ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <xen/hypercall.h>
+#include <asm/vgic.h>
+
+int arch_dm_op(struct xen_dm_op *op, struct domain *d,
+ const struct dmop_args *op_args, bool *const_op)
+{
+ return -EOPNOTSUPP;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 3116932..658eec0 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -12,6 +12,7 @@
#include <xen/bitops.h>
#include <xen/errno.h>
#include <xen/grant_table.h>
+#include <xen/hvm/ioreq.h>
#include <xen/hypercall.h>
#include <xen/init.h>
#include <xen/lib.h>
@@ -681,6 +682,10 @@ int arch_domain_create(struct domain *d,

ASSERT(config != NULL);

+#ifdef CONFIG_IOREQ_SERVER
+ hvm_ioreq_init(d);
+#endif
+
/* p2m_init relies on some value initialized by the IOMMU subsystem */
if ( (rc = iommu_domain_init(d, config->iommu_opts)) != 0 )
goto fail;
@@ -999,6 +1004,10 @@ int domain_relinquish_resources(struct domain *d)
if (ret )
return ret;

+#ifdef CONFIG_IOREQ_SERVER
+ hvm_destroy_all_ioreq_servers(d);
+#endif
+
PROGRESS(xen):
ret = relinquish_memory(d, &d->xenpage_list);
if ( ret )
diff --git a/xen/arch/arm/hvm.c b/xen/arch/arm/hvm.c
index 8951b34..0379493 100644
--- a/xen/arch/arm/hvm.c
+++ b/xen/arch/arm/hvm.c
@@ -51,6 +51,14 @@ static int hvm_allow_set_param(const struct domain *d, unsigned int param)
case HVM_PARAM_MONITOR_RING_PFN:
return d == current->domain ? -EPERM : 0;

+ /*
+ * XXX: Do we need to follow x86's logic here:
+ * "The following parameters should only be changed once"?
+ */
+ case HVM_PARAM_IOREQ_SERVER_PFN:
+ case HVM_PARAM_NR_IOREQ_SERVER_PAGES:
+ return 0;
+
/* Writeable only by Xen, hole, deprecated, or out-of-range. */
default:
return -EINVAL;
@@ -69,6 +77,11 @@ static int hvm_allow_get_param(const struct domain *d, unsigned int param)
case HVM_PARAM_CONSOLE_EVTCHN:
return 0;

+ /* XXX: Could these be read by someone? What policy to apply? */
+ case HVM_PARAM_IOREQ_SERVER_PFN:
+ case HVM_PARAM_NR_IOREQ_SERVER_PAGES:
+ return 0;
+
/*
* The following parameters are intended for toolstack usage only.
* They may not be read by the domain.
@@ -82,6 +95,37 @@ static int hvm_allow_get_param(const struct domain *d, unsigned int param)
}
}

+static int hvmop_set_param(struct domain *d, const struct xen_hvm_param *a)
+{
+ int rc = 0;
+
+ switch ( a->index )
+ {
+ case HVM_PARAM_IOREQ_SERVER_PFN:
+ d->arch.hvm.ioreq_gfn.base = a->value;
+ break;
+ case HVM_PARAM_NR_IOREQ_SERVER_PAGES:
+ {
+ unsigned int i;
+
+ if ( a->value == 0 ||
+ a->value > sizeof(d->arch.hvm.ioreq_gfn.mask) * 8 )
+ {
+ rc = -EINVAL;
+ break;
+ }
+ for ( i = 0; i < a->value; i++ )
+ set_bit(i, &d->arch.hvm.ioreq_gfn.mask);
+
+ break;
+ }
+ }
+
+ d->arch.hvm.params[a->index] = a->value;
+
+ return rc;
+}
+
long do_hvm_op(unsigned long op, XEN_GUEST_HANDLE_PARAM(void) arg)
{
long rc = 0;
@@ -111,7 +155,7 @@ long do_hvm_op(unsigned long op, XEN_GUEST_HANDLE_PARAM(void) arg)
if ( rc )
goto param_fail;

- d->arch.hvm.params[a.index] = a.value;
+ rc = hvmop_set_param(d, &a);
}
else
{
diff --git a/xen/arch/arm/io.c b/xen/arch/arm/io.c
index ae7ef96..436f669 100644
--- a/xen/arch/arm/io.c
+++ b/xen/arch/arm/io.c
@@ -16,6 +16,7 @@
* GNU General Public License for more details.
*/

+#include <xen/hvm/ioreq.h>
#include <xen/lib.h>
#include <xen/spinlock.h>
#include <xen/sched.h>
@@ -107,6 +108,62 @@ static const struct mmio_handler *find_mmio_handler(struct domain *d,
return handler;
}

+#ifdef CONFIG_IOREQ_SERVER
+static enum io_state try_fwd_ioserv(struct cpu_user_regs *regs,
+ struct vcpu *v, mmio_info_t *info)
+{
+ struct hvm_vcpu_io *vio = &v->arch.hvm.hvm_io;
+ ioreq_t p = {
+ .type = IOREQ_TYPE_COPY,
+ .addr = info->gpa,
+ .size = 1 << info->dabt.size,
+ .count = 0,
+ .dir = !info->dabt.write,
+ .df = 0, /* XXX: What's for? */
+ .data = get_user_reg(regs, info->dabt.reg),
+ .state = STATE_IOREQ_READY,
+ };
+ struct hvm_ioreq_server *s = NULL;
+ enum io_state rc;
+
+ switch ( vio->io_req.state )
+ {
+ case STATE_IOREQ_NONE:
+ break;
+ default:
+ printk("d%u wrong state %u\n", v->domain->domain_id,
+ vio->io_req.state);
+ return IO_ABORT;
+ }
+
+ s = hvm_select_ioreq_server(v->domain, &p);
+ if ( !s )
+ return IO_UNHANDLED;
+
+ if ( !info->dabt.valid )
+ {
+ printk("Valid bit not set\n");
+ return IO_ABORT;
+ }
+
+ vio->io_req = p;
+
+ rc = hvm_send_ioreq(s, &p, 0);
+ if ( rc != IO_RETRY || v->domain->is_shutting_down )
+ vio->io_req.state = STATE_IOREQ_NONE;
+ else if ( !hvm_ioreq_needs_completion(&vio->io_req) )
+ rc = IO_HANDLED;
+ else
+ vio->io_completion = HVMIO_mmio_completion;
+
+ /* XXX: Decide what to do */
+ if ( rc == IO_RETRY )
+ rc = IO_HANDLED;
+
+ return rc;
+}
+#endif
+
enum io_state try_handle_mmio(struct cpu_user_regs *regs,
const union hsr hsr,
paddr_t gpa)
@@ -123,7 +180,15 @@ enum io_state try_handle_mmio(struct cpu_user_regs *regs,

handler = find_mmio_handler(v->domain, info.gpa);
if ( !handler )
- return IO_UNHANDLED;
+ {
+ int rc = IO_UNHANDLED;
+
+#ifdef CONFIG_IOREQ_SERVER
+ rc = try_fwd_ioserv(regs, v, &info);
+#endif
+
+ return rc;
+ }

/* All the instructions used on emulated MMIO region should be valid */
if ( !dabt.valid )
diff --git a/xen/arch/arm/ioreq.c b/xen/arch/arm/ioreq.c
new file mode 100644
index 0000000..a9cc839
--- /dev/null
+++ b/xen/arch/arm/ioreq.c
@@ -0,0 +1,86 @@
+/*
+ * arm/ioreq.c: hardware virtual machine I/O emulation
+ *
+ * Copyright (c) 2019 Arm ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <xen/ctype.h>
+#include <xen/hvm/ioreq.h>
+#include <xen/init.h>
+#include <xen/lib.h>
+#include <xen/trace.h>
+#include <xen/sched.h>
+#include <xen/irq.h>
+#include <xen/softirq.h>
+#include <xen/domain.h>
+#include <xen/domain_page.h>
+#include <xen/event.h>
+#include <xen/paging.h>
+#include <xen/vpci.h>
+
+#include <public/hvm/dm_op.h>
+#include <public/hvm/ioreq.h>
+
+bool handle_mmio(void)
+{
+ struct vcpu *v = current;
+ struct cpu_user_regs *regs = guest_cpu_user_regs();
+ const union hsr hsr = { .bits = regs->hsr };
+ const struct hsr_dabt dabt = hsr.dabt;
+ /* Code is similar to handle_read */
+ uint8_t size = (1 << dabt.size) * 8;
+ register_t r = v->arch.hvm.hvm_io.io_req.data;
+
+ /* We should only be here on Guest Data Abort */
+ ASSERT(dabt.ec == HSR_EC_DATA_ABORT_LOWER_EL);
+
+ /* We are done with the IO */
+ /* XXX: Is it the right place? */
+ v->arch.hvm.hvm_io.io_req.state = STATE_IOREQ_NONE;
+
+ /* XXX: Do we need to take care of write here ? */
+ if ( dabt.write )
+ return true;
+
+ /*
+ * Sign extend if required.
+ * Note that we expect the read handler to have zeroed the bits
+ * outside the requested access size.
+ */
+ if ( dabt.sign && (r & (1UL << (size - 1))) )
+ {
+ /*
+ * We are relying on register_t using the same as
+ * an unsigned long in order to keep the 32-bit assembly
+ * code smaller.
+ */
+ BUILD_BUG_ON(sizeof(register_t) != sizeof(unsigned long));
+ r |= (~0UL) << size;
+ }
+
+ set_user_reg(regs, dabt.reg, r);
+
+ return true;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 8f40d0e..4cdf098 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -18,6 +18,7 @@

#include <xen/domain_page.h>
#include <xen/errno.h>
+#include <xen/hvm/ioreq.h>
#include <xen/hypercall.h>
#include <xen/init.h>
#include <xen/iocap.h>
@@ -1384,6 +1385,9 @@ static arm_hypercall_t arm_hypercall_table[] = {
#ifdef CONFIG_HYPFS
HYPERCALL(hypfs_op, 5),
#endif
+#ifdef CONFIG_IOREQ_SERVER
+ HYPERCALL(dm_op, 3),
+#endif
};

#ifndef NDEBUG
@@ -1958,6 +1962,9 @@ static void do_trap_stage2_abort_guest(struct cpu_user_regs *regs,
case IO_UNHANDLED:
/* IO unhandled, try another way to handle it. */
break;
+ default:
+ /* XXX: Handle IO_RETRY */
+ ASSERT_UNREACHABLE();
}
}

@@ -2275,6 +2282,16 @@ static void check_for_vcpu_work(void)
*/
void leave_hypervisor_to_guest(void)
{
+#ifdef CONFIG_IOREQ_SERVER
+ /*
+ * XXX: Check the return. Shall we call that in
+ * continue_running and context_switch instead?
+ * The benefits would be to avoid calling
+ * handle_hvm_io_completion on every return.
+ */
+ local_irq_enable();
+ handle_hvm_io_completion(current);
+#endif
local_irq_disable();

check_for_vcpu_work();
diff --git a/xen/common/memory.c b/xen/common/memory.c
index 9283e5e..0000477 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -8,6 +8,7 @@
*/

#include <xen/domain_page.h>
+#include <xen/hvm/ioreq.h>
#include <xen/types.h>
#include <xen/lib.h>
#include <xen/mm.h>
@@ -30,10 +31,6 @@
#include <public/memory.h>
#include <xsm/xsm.h>

-#ifdef CONFIG_IOREQ_SERVER
-#include <xen/hvm/ioreq.h>
-#endif
-
#ifdef CONFIG_X86
#include <asm/guest.h>
#endif
diff --git a/xen/include/asm-arm/domain.h b/xen/include/asm-arm/domain.h
index 4e2f582..e060b0a 100644
--- a/xen/include/asm-arm/domain.h
+++ b/xen/include/asm-arm/domain.h
@@ -11,12 +11,64 @@
#include <asm/vgic.h>
#include <asm/vpl011.h>
#include <public/hvm/params.h>
+#include <public/hvm/dm_op.h>
+#include <public/hvm/ioreq.h>
#include <xen/serial.h>
#include <xen/rbtree.h>

+struct hvm_ioreq_page {
+ gfn_t gfn;
+ struct page_info *page;
+ void *va;
+};
+
+struct hvm_ioreq_vcpu {
+ struct list_head list_entry;
+ struct vcpu *vcpu;
+ evtchn_port_t ioreq_evtchn;
+ bool pending;
+};
+
+#define NR_IO_RANGE_TYPES (XEN_DMOP_IO_RANGE_PCI + 1)
+#define MAX_NR_IO_RANGES 256
+
+#define MAX_NR_IOREQ_SERVERS 8
+#define DEFAULT_IOSERVID 0
+
+struct hvm_ioreq_server {
+ struct domain *target, *emulator;
+
+ /* Lock to serialize toolstack modifications */
+ spinlock_t lock;
+
+ struct hvm_ioreq_page ioreq;
+ struct list_head ioreq_vcpu_list;
+ struct hvm_ioreq_page bufioreq;
+
+ /* Lock to serialize access to buffered ioreq ring */
+ spinlock_t bufioreq_lock;
+ evtchn_port_t bufioreq_evtchn;
+ struct rangeset *range[NR_IO_RANGE_TYPES];
+ bool enabled;
+ uint8_t bufioreq_handling;
+};
+
struct hvm_domain
{
uint64_t params[HVM_NR_PARAMS];
+
+ /* Guest page range used for non-default ioreq servers */
+ struct {
+ unsigned long base;
+ unsigned long mask;
+ unsigned long legacy_mask; /* indexed by HVM param number */
+ } ioreq_gfn;
+
+ /* Lock protects all other values in the sub-struct and the default */
+ struct {
+ spinlock_t lock;
+ struct hvm_ioreq_server *server[MAX_NR_IOREQ_SERVERS];
+ } ioreq_server;
};

#ifdef CONFIG_ARM_64
@@ -93,6 +145,29 @@ struct arch_domain
#endif
} __cacheline_aligned;

+enum hvm_io_completion {
+ HVMIO_no_completion,
+ HVMIO_mmio_completion,
+ HVMIO_pio_completion,
+ HVMIO_realmode_completion
+};
+
+struct hvm_vcpu_io {
+ /* I/O request in flight to device model. */
+ enum hvm_io_completion io_completion;
+ ioreq_t io_req;
+
+ /*
+ * HVM emulation:
+ * Linear address @mmio_gla maps to MMIO physical frame @mmio_gpfn.
+ * The latter is known to be an MMIO frame (not RAM).
+ * This translation is only valid for accesses as per @mmio_access.
+ */
+ struct npfec mmio_access;
+ unsigned long mmio_gla;
+ unsigned long mmio_gpfn;
+};
+
struct arch_vcpu
{
struct {
@@ -206,6 +281,11 @@ struct arch_vcpu
*/
bool need_flush_to_ram;

+ struct hvm_vcpu
+ {
+ struct hvm_vcpu_io hvm_io;
+ } hvm;
+
} __cacheline_aligned;

void vcpu_show_execution_state(struct vcpu *);
diff --git a/xen/include/asm-arm/hvm/ioreq.h b/xen/include/asm-arm/hvm/ioreq.h
new file mode 100644
index 0000000..83a560c
--- /dev/null
+++ b/xen/include/asm-arm/hvm/ioreq.h
@@ -0,0 +1,103 @@
+/*
+ * hvm.h: Hardware virtual machine assist interface definitions.
+ *
+ * Copyright (c) 2016 Citrix Systems Inc.
+ * Copyright (c) 2019 Arm ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ASM_ARM_HVM_IOREQ_H__
+#define __ASM_ARM_HVM_IOREQ_H__
+
+#include <public/hvm/ioreq.h>
+#include <public/hvm/dm_op.h>
+
+#define has_vpci(d) (false)
+
+bool handle_mmio(void);
+
+static inline bool handle_pio(uint16_t port, unsigned int size, int dir)
+{
+ /* XXX */
+ BUG();
+ return true;
+}
+
+static inline paddr_t hvm_mmio_first_byte(const ioreq_t *p)
+{
+ return p->addr;
+}
+
+static inline paddr_t hvm_mmio_last_byte(const ioreq_t *p)
+{
+ unsigned long size = p->size;
+
+ return p->addr + size - 1;
+}
+
+struct hvm_ioreq_server;
+
+static inline int p2m_set_ioreq_server(struct domain *d,
+ unsigned int flags,
+ struct hvm_ioreq_server *s)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline void msix_write_completion(struct vcpu *v)
+{
+}
+
+static inline void handle_realmode_completion(void)
+{
+ ASSERT_UNREACHABLE();
+}
+
+static inline void paging_mark_pfn_dirty(struct domain *d, pfn_t pfn)
+{
+}
+
+static inline void hvm_get_ioreq_server_range_type(struct domain *d,
+ ioreq_t *p,
+ uint8_t *type,
+ uint64_t *addr)
+{
+ *type = (p->type == IOREQ_TYPE_PIO) ?
+ XEN_DMOP_IO_RANGE_PORT : XEN_DMOP_IO_RANGE_MEMORY;
+ *addr = p->addr;
+}
+
+static inline void arch_hvm_ioreq_init(struct domain *d)
+{
+}
+
+static inline void arch_hvm_ioreq_destroy(struct domain *d)
+{
+}
+
+#define IOREQ_IO_HANDLED IO_HANDLED
+#define IOREQ_IO_UNHANDLED IO_UNHANDLED
+#define IOREQ_IO_RETRY IO_RETRY
+
+#endif /* __ASM_X86_HVM_IOREQ_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-arm/mmio.h b/xen/include/asm-arm/mmio.h
index 8dbfb27..7ab873c 100644
--- a/xen/include/asm-arm/mmio.h
+++ b/xen/include/asm-arm/mmio.h
@@ -37,6 +37,7 @@ enum io_state
IO_ABORT, /* The IO was handled by the helper and led to an abort. */
IO_HANDLED, /* The IO was successfully handled by the helper. */
IO_UNHANDLED, /* The IO was not handled by the helper. */
+ IO_RETRY, /* Retry the emulation for some reason */
};

typedef int (*mmio_read_t)(struct vcpu *v, mmio_info_t *info,
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index 5fdb6e8..5823f11 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -385,10 +385,11 @@ static inline int set_foreign_p2m_entry(struct domain *d, unsigned long gfn,
mfn_t mfn)
{
/*
- * NOTE: If this is implemented then proper reference counting of
- * foreign entries will need to be implemented.
+ * XXX: handle properly reference. It looks like the page may not always
+ * belong to d.
*/
- return -EOPNOTSUPP;
+
+ return guest_physmap_add_entry(d, _gfn(gfn), mfn, 0, p2m_ram_rw);
}

/*
diff --git a/xen/include/xsm/dummy.h b/xen/include/xsm/dummy.h
index 2368ace..317455a 100644
--- a/xen/include/xsm/dummy.h
+++ b/xen/include/xsm/dummy.h
@@ -713,14 +713,14 @@ static XSM_INLINE int xsm_pmu_op (XSM_DEFAULT_ARG struct domain *d, unsigned int
}
}

+#endif /* CONFIG_X86 */
+
static XSM_INLINE int xsm_dm_op(XSM_DEFAULT_ARG struct domain *d)
{
XSM_ASSERT_ACTION(XSM_DM_PRIV);
return xsm_default_action(action, current->domain, d);
}

-#endif /* CONFIG_X86 */
-
#ifdef CONFIG_ARGO
static XSM_INLINE int xsm_argo_enable(const struct domain *d)
{
diff --git a/xen/include/xsm/xsm.h b/xen/include/xsm/xsm.h
index a80bcf3..2a9b39d 100644
--- a/xen/include/xsm/xsm.h
+++ b/xen/include/xsm/xsm.h
@@ -177,8 +177,8 @@ struct xsm_operations {
int (*ioport_permission) (struct domain *d, uint32_t s, uint32_t e, uint8_t allow);
int (*ioport_mapping) (struct domain *d, uint32_t s, uint32_t e, uint8_t allow);
int (*pmu_op) (struct domain *d, unsigned int op);
- int (*dm_op) (struct domain *d);
#endif
+ int (*dm_op) (struct domain *d);
int (*xen_version) (uint32_t cmd);
int (*domain_resource_map) (struct domain *d);
#ifdef CONFIG_ARGO
@@ -688,13 +688,13 @@ static inline int xsm_pmu_op (xsm_default_t def, struct domain *d, unsigned int
return xsm_ops->pmu_op(d, op);
}

+#endif /* CONFIG_X86 */
+
static inline int xsm_dm_op(xsm_default_t def, struct domain *d)
{
return xsm_ops->dm_op(d);
}

-#endif /* CONFIG_X86 */
-
static inline int xsm_xen_version (xsm_default_t def, uint32_t op)
{
return xsm_ops->xen_version(op);
diff --git a/xen/xsm/dummy.c b/xen/xsm/dummy.c
index d4cce68..e3afd06 100644
--- a/xen/xsm/dummy.c
+++ b/xen/xsm/dummy.c
@@ -148,8 +148,8 @@ void __init xsm_fixup_ops (struct xsm_operations *ops)
set_to_dummy_if_null(ops, ioport_permission);
set_to_dummy_if_null(ops, ioport_mapping);
set_to_dummy_if_null(ops, pmu_op);
- set_to_dummy_if_null(ops, dm_op);
#endif
+ set_to_dummy_if_null(ops, dm_op);
set_to_dummy_if_null(ops, xen_version);
set_to_dummy_if_null(ops, domain_resource_map);
#ifdef CONFIG_ARGO
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index a314bf8..645192a 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -1662,14 +1662,13 @@ static int flask_pmu_op (struct domain *d, unsigned int op)
return -EPERM;
}
}
+#endif /* CONFIG_X86 */

static int flask_dm_op(struct domain *d)
{
return current_has_perm(d, SECCLASS_HVM, HVM__DM);
}

-#endif /* CONFIG_X86 */
-
static int flask_xen_version (uint32_t op)
{
u32 dsid = domain_sid(current->domain);
@@ -1872,8 +1871,8 @@ static struct xsm_operations flask_ops = {
.ioport_permission = flask_ioport_permission,
.ioport_mapping = flask_ioport_mapping,
.pmu_op = flask_pmu_op,
- .dm_op = flask_dm_op,
#endif
+ .dm_op = flask_dm_op,
.xen_version = flask_xen_version,
.domain_resource_map = flask_domain_resource_map,
#ifdef CONFIG_ARGO
--
2.7.4