[xen staging] xen/arm: Introduce gpaddr_bits field to struct xen_domctl_getdomaininfo

[patchbot@xxxxxxx]

commit 1e6706b0d12300a81db91e07af8340720a8d67c6
Author:     Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
AuthorDate: Thu Oct 14 14:40:44 2021 +0300
Commit:     Ian Jackson <iwj@xxxxxxxxxxxxxx>
CommitDate: Thu Oct 14 15:18:32 2021 +0100

    xen/arm: Introduce gpaddr_bits field to struct xen_domctl_getdomaininfo
    
    We need to pass info about maximum supported guest physical
    address space size to the toolstack on Arm in order to properly
    calculate the base and size of the extended region (safe range)
    for the guest. The extended region is unused address space which
    could be safely used by domain for foreign/grant mappings on Arm.
    The extended region itself will be handled by the subsequent
    patch.
    
    Currently the same guest physical address space size is used
    for all guests (p2m_ipa_bits variable on Arm, the x86 equivalent
    is hap_paddr_bits).
    
    Add an explicit padding after "gpaddr_bits" field and also
    (while at it) after "domain" field.
    
    Also make sure that full structure is cleared in all cases by
    moving the clearing into getdomaininfo(). Currently it is only
    cleared by the sysctl caller (and only once).
    
    Please note, we do not need to bump XEN_DOMCTL_INTERFACE_VERSION
    as a bump has already occurred in this release cycle. But we do
    need to bump XEN_SYSCTL_INTERFACE_VERSION as the structure is
    re-used in a sysctl.
    
    Suggested-by: Julien Grall <jgrall@xxxxxxxxxx>
    Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
    Reviewed-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
    [hypervisor parts]
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 tools/include/libxl.h            | 8 ++++++++
 tools/include/xenctrl.h          | 1 +
 tools/libs/ctrl/xc_domain.c      | 1 +
 tools/libs/light/libxl_domain.c  | 1 +
 tools/libs/light/libxl_types.idl | 1 +
 xen/arch/arm/domctl.c            | 2 ++
 xen/arch/x86/domctl.c            | 1 +
 xen/common/domctl.c              | 4 ++--
 xen/common/sysctl.c              | 2 +-
 xen/include/public/domctl.h      | 3 +++
 xen/include/public/sysctl.h      | 2 +-
 11 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/tools/include/libxl.h b/tools/include/libxl.h
index ee73eb06f1..2e8679dbcb 100644
--- a/tools/include/libxl.h
+++ b/tools/include/libxl.h
@@ -885,6 +885,14 @@ typedef struct libxl__ctx libxl_ctx;
  */
 #define LIBXL_HAVE_DOMINFO_NEVER_STOP 1
 
+/*
+ * LIBXL_HAVE_DOMINFO_GPADDR_BITS
+ *
+ * If this is defined, libxl_dominfo will contain an uint8 field called
+ * gpaddr_bits, containing the guest physical address space size.
+ */
+#define LIBXL_HAVE_DOMINFO_GPADDR_BITS 1
+
 /*
  * LIBXL_HAVE_QXL
  *
diff --git a/tools/include/xenctrl.h b/tools/include/xenctrl.h
index a3063998e0..07b96e6671 100644
--- a/tools/include/xenctrl.h
+++ b/tools/include/xenctrl.h
@@ -462,6 +462,7 @@ typedef struct xc_dominfo {
     unsigned int  max_vcpu_id;
     xen_domain_handle_t handle;
     unsigned int  cpupool;
+    uint8_t       gpaddr_bits;
     struct xen_arch_domainconfig arch_config;
 } xc_dominfo_t;
 
diff --git a/tools/libs/ctrl/xc_domain.c b/tools/libs/ctrl/xc_domain.c
index 23322b70b5..b155d6afd2 100644
--- a/tools/libs/ctrl/xc_domain.c
+++ b/tools/libs/ctrl/xc_domain.c
@@ -396,6 +396,7 @@ int xc_domain_getinfo(xc_interface *xch,
         info->nr_online_vcpus = domctl.u.getdomaininfo.nr_online_vcpus;
         info->max_vcpu_id = domctl.u.getdomaininfo.max_vcpu_id;
         info->cpupool = domctl.u.getdomaininfo.cpupool;
+        info->gpaddr_bits = domctl.u.getdomaininfo.gpaddr_bits;
         info->arch_config = domctl.u.getdomaininfo.arch_config;
 
         memcpy(info->handle, domctl.u.getdomaininfo.handle,
diff --git a/tools/libs/light/libxl_domain.c b/tools/libs/light/libxl_domain.c
index 51a6127552..544a9bf59d 100644
--- a/tools/libs/light/libxl_domain.c
+++ b/tools/libs/light/libxl_domain.c
@@ -306,6 +306,7 @@ void libxl__xcinfo2xlinfo(libxl_ctx *ctx,
     xlinfo->vcpu_max_id = xcinfo->max_vcpu_id;
     xlinfo->vcpu_online = xcinfo->nr_online_vcpus;
     xlinfo->cpupool = xcinfo->cpupool;
+    xlinfo->gpaddr_bits = xcinfo->gpaddr_bits;
     xlinfo->domain_type = (xcinfo->flags & XEN_DOMINF_hvm_guest) ?
         LIBXL_DOMAIN_TYPE_HVM : LIBXL_DOMAIN_TYPE_PV;
 }
diff --git a/tools/libs/light/libxl_types.idl b/tools/libs/light/libxl_types.idl
index b96fb5c47e..608d55a456 100644
--- a/tools/libs/light/libxl_types.idl
+++ b/tools/libs/light/libxl_types.idl
@@ -357,6 +357,7 @@ libxl_dominfo = Struct("dominfo",[
     ("vcpu_max_id", uint32),
     ("vcpu_online", uint32),
     ("cpupool",     uint32),
+    ("gpaddr_bits", uint8),
     ("domain_type", libxl_domain_type),
     ], dir=DIR_OUT)
 
diff --git a/xen/arch/arm/domctl.c b/xen/arch/arm/domctl.c
index b7d27f37df..6245af6d0b 100644
--- a/xen/arch/arm/domctl.c
+++ b/xen/arch/arm/domctl.c
@@ -20,6 +20,8 @@ void arch_get_domain_info(const struct domain *d,
 {
     /* All ARM domains use hardware assisted paging. */
     info->flags |= XEN_DOMINF_hap;
+
+    info->gpaddr_bits = p2m_ipa_bits;
 }
 
 static int handle_vuart_init(struct domain *d, 
diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index 26a76d2be9..7d102e0647 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -151,6 +151,7 @@ void arch_get_domain_info(const struct domain *d,
         info->flags |= XEN_DOMINF_hap;
 
     info->arch_config.emulation_flags = d->arch.emulation_flags;
+    info->gpaddr_bits = hap_paddr_bits;
 }
 
 static int do_vmtrace_op(struct domain *d, struct xen_domctl_vmtrace_op *op,
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index 12d6144d28..271862ae58 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -69,10 +69,10 @@ void getdomaininfo(struct domain *d, struct 
xen_domctl_getdomaininfo *info)
     int flags = XEN_DOMINF_blocked;
     struct vcpu_runstate_info runstate;
 
+    memset(info, 0, sizeof(*info));
+
     info->domain = d->domain_id;
     info->max_vcpu_id = XEN_INVALID_MAX_VCPU_ID;
-    info->nr_online_vcpus = 0;
-    info->ssidref = 0;
 
     /*
      * - domain is marked as blocked only if all its vcpus are blocked
diff --git a/xen/common/sysctl.c b/xen/common/sysctl.c
index 6e7189bb3c..f2dab722b6 100644
--- a/xen/common/sysctl.c
+++ b/xen/common/sysctl.c
@@ -76,7 +76,7 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xen_sysctl_t) u_sysctl)
     case XEN_SYSCTL_getdomaininfolist:
     { 
         struct domain *d;
-        struct xen_domctl_getdomaininfo info = { 0 };
+        struct xen_domctl_getdomaininfo info;
         u32 num_domains = 0;
 
         rcu_read_lock(&domlist_read_lock);
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 238384b5ae..51017b47bc 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -107,6 +107,7 @@ struct xen_domctl_createdomain {
 struct xen_domctl_getdomaininfo {
     /* OUT variables. */
     domid_t  domain;              /* Also echoed in domctl.domain */
+    uint16_t pad1;
  /* Domain is scheduled to die. */
 #define _XEN_DOMINF_dying     0
 #define XEN_DOMINF_dying      (1U<<_XEN_DOMINF_dying)
@@ -151,6 +152,8 @@ struct xen_domctl_getdomaininfo {
     uint32_t ssidref;
     xen_domain_handle_t handle;
     uint32_t cpupool;
+    uint8_t gpaddr_bits; /* Guest physical address space size. */
+    uint8_t pad2[7];
     struct xen_arch_domainconfig arch_config;
 };
 typedef struct xen_domctl_getdomaininfo xen_domctl_getdomaininfo_t;
diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
index fead0e5b53..3e53681b43 100644
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -35,7 +35,7 @@
 #include "domctl.h"
 #include "physdev.h"
 
-#define XEN_SYSCTL_INTERFACE_VERSION 0x00000013
+#define XEN_SYSCTL_INTERFACE_VERSION 0x00000014
 
 /*
  * Read console content from Xen buffer ring.
--
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