[PATCH v4 08/11] x86/vmce, tools/libxl: expose LMCE capability in guest MSR_IA32_MCG_CAP

[Haozhong Zhang <haozhong.zhang@intel.com>]

If LMCE is supported by host and ' mca_caps = [ "lmce" ] ' is present
in xl config, the LMCE capability will be exposed in guest MSR_IA32_MCG_CAP.
By default, LMCE is not exposed to guest so as to keep the backwards migration
compatibility.

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com> for hypervisor side
---
Changes in v4:
 * Handle HVM_PARAM_MCA_CAP in xc_sr_save_x86_hvm.c:write_hvm_params().

Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
---
 docs/man/xl.cfg.pod.5.in            | 24 ++++++++++++++++++++++++
 tools/libxc/xc_sr_save_x86_hvm.c    |  1 +
 tools/libxl/libxl.h                 |  7 +++++++
 tools/libxl/libxl_dom.c             | 15 +++++++++++++++
 tools/libxl/libxl_types.idl         |  1 +
 tools/xl/xl_parse.c                 | 31 +++++++++++++++++++++++++++++--
 xen/arch/x86/cpu/mcheck/mce.h       |  1 +
 xen/arch/x86/cpu/mcheck/mce_intel.c |  2 +-
 xen/arch/x86/cpu/mcheck/vmce.c      | 19 ++++++++++++++++++-
 xen/arch/x86/hvm/hvm.c              |  5 +++++
 xen/include/asm-x86/mce.h           |  1 +
 xen/include/public/hvm/params.h     |  7 ++++++-
 12 files changed, 109 insertions(+), 5 deletions(-)

diff --git a/docs/man/xl.cfg.pod.5.in b/docs/man/xl.cfg.pod.5.in
index 38084c723a..51ec74325d 100644
--- a/docs/man/xl.cfg.pod.5.in
+++ b/docs/man/xl.cfg.pod.5.in
@@ -2168,6 +2168,30 @@ natively or via hardware backwards compatibility support.
 
 =back
 
+=head3 x86
+
+=over 4
+
+=item B<mca_caps=[ "CAP", "CAP", ... ]>
+
+(HVM only) Enable MCA capabilities besides default ones enabled
+by Xen hypervisor for the HVM domain. "CAP" can be one in the
+following list:
+
+=over 4
+
+=item B<"lmce">
+
+Intel local MCE
+
+=item B<default>
+
+No MCA capabilities in above list are enabled.
+
+=back
+
+=back
+
 =head1 SEE ALSO
 
 =over 4
diff --git a/tools/libxc/xc_sr_save_x86_hvm.c b/tools/libxc/xc_sr_save_x86_hvm.c
index fc5c6ea93e..e17bb59146 100644
--- a/tools/libxc/xc_sr_save_x86_hvm.c
+++ b/tools/libxc/xc_sr_save_x86_hvm.c
@@ -77,6 +77,7 @@ static int write_hvm_params(struct xc_sr_context *ctx)
         HVM_PARAM_IOREQ_SERVER_PFN,
         HVM_PARAM_NR_IOREQ_SERVER_PAGES,
         HVM_PARAM_X87_FIP_WIDTH,
+        HVM_PARAM_MCA_CAP,
     };
 
     xc_interface *xch = ctx->xch;
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index cf8687aa7e..7cf0f31f68 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -922,6 +922,13 @@ void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, const libxl_mac *src);
  * If this is defined, the Code and Data Prioritization feature is supported.
  */
 #define LIBXL_HAVE_PSR_CDP 1
+
+/*
+ * LIBXL_HAVE_MCA_CAPS
+ *
+ * If this is defined, setting MCA capabilities for HVM domain is supported.
+ */
+#define LIBXL_HAVE_MCA_CAPS 1
 #endif
 
 /*
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index 5d914a59ee..f54fd49a73 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -279,6 +279,17 @@ err:
     libxl_bitmap_dispose(&enlightenments);
     return ERROR_FAIL;
 }
+
+static int hvm_set_mca_capabilities(libxl__gc *gc, uint32_t domid,
+                                    libxl_domain_build_info *const info)
+{
+    unsigned long caps = info->u.hvm.mca_caps;
+
+    if (!caps)
+        return 0;
+
+    return xc_hvm_param_set(CTX->xch, domid, HVM_PARAM_MCA_CAP, caps);
+}
 #endif
 
 static void hvm_set_conf_params(xc_interface *handle, uint32_t domid,
@@ -440,6 +451,10 @@ int libxl__build_pre(libxl__gc *gc, uint32_t domid,
         rc = hvm_set_viridian_features(gc, domid, info);
         if (rc)
             return rc;
+
+        rc = hvm_set_mca_capabilities(gc, domid, info);
+        if (rc)
+            return rc;
 #endif
     }
 
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 22044259f3..8a9849c643 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -564,6 +564,7 @@ libxl_domain_build_info = Struct("domain_build_info",[
                                        ("serial_list",      libxl_string_list),
                                        ("rdm", libxl_rdm_reserve),
                                        ("rdm_mem_boundary_memkb", MemKB),
+                                       ("mca_caps",         uint64),
                                        ])),
                  ("pv", Struct(None, [("kernel", string),
                                       ("slack_memkb", MemKB),
diff --git a/tools/xl/xl_parse.c b/tools/xl/xl_parse.c
index 856a304b30..5c2bf17222 100644
--- a/tools/xl/xl_parse.c
+++ b/tools/xl/xl_parse.c
@@ -18,6 +18,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <xen/hvm/e820.h>
+#include <xen/hvm/params.h>
 
 #include <libxl.h>
 #include <libxl_utils.h>
@@ -813,8 +814,9 @@ void parse_config_data(const char *config_source,
     XLU_Config *config;
     XLU_ConfigList *cpus, *vbds, *nics, *pcis, *cvfbs, *cpuids, *vtpms,
                    *usbctrls, *usbdevs, *p9devs;
-    XLU_ConfigList *channels, *ioports, *irqs, *iomem, *viridian, *dtdevs;
-    int num_ioports, num_irqs, num_iomem, num_cpus, num_viridian;
+    XLU_ConfigList *channels, *ioports, *irqs, *iomem, *viridian, *dtdevs,
+                   *mca_caps;
+    int num_ioports, num_irqs, num_iomem, num_cpus, num_viridian, num_mca_caps;
     int pci_power_mgmt = 0;
     int pci_msitranslate = 0;
     int pci_permissive = 0;
@@ -1182,6 +1184,31 @@ void parse_config_data(const char *config_source,
 
         if (!xlu_cfg_get_long (config, "rdm_mem_boundary", &l, 0))
             b_info->u.hvm.rdm_mem_boundary_memkb = l * 1024;
+
+        switch (xlu_cfg_get_list(config, "mca_caps",
+                                 &mca_caps, &num_mca_caps, 1))
+        {
+        case 0: /* Success */
+            for (i = 0; i < num_mca_caps; i++) {
+                buf = xlu_cfg_get_listitem(mca_caps, i);
+                if (!strcmp(buf, "lmce"))
+                    b_info->u.hvm.mca_caps |= XEN_HVM_MCA_CAP_LMCE;
+                else {
+                    fprintf(stderr, "ERROR: unrecognized MCA capability '%s'.\n",
+                            buf);
+                    exit(-ERROR_FAIL);
+                }
+            }
+            break;
+
+        case ESRCH: /* Option not present */
+            break;
+
+        default:
+            fprintf(stderr, "ERROR: unable to parse mca_caps.\n");
+            exit(-ERROR_FAIL);
+        }
+
         break;
     case LIBXL_DOMAIN_TYPE_PV:
     {
diff --git a/xen/arch/x86/cpu/mcheck/mce.h b/xen/arch/x86/cpu/mcheck/mce.h
index 4f13791948..664161a2af 100644
--- a/xen/arch/x86/cpu/mcheck/mce.h
+++ b/xen/arch/x86/cpu/mcheck/mce.h
@@ -38,6 +38,7 @@ enum mcheck_type {
 };
 
 extern uint8_t cmci_apic_vector;
+extern bool lmce_support;
 
 /* Init functions */
 enum mcheck_type amd_mcheck_init(struct cpuinfo_x86 *c);
diff --git a/xen/arch/x86/cpu/mcheck/mce_intel.c b/xen/arch/x86/cpu/mcheck/mce_intel.c
index 5cb49ca697..4c001b407f 100644
--- a/xen/arch/x86/cpu/mcheck/mce_intel.c
+++ b/xen/arch/x86/cpu/mcheck/mce_intel.c
@@ -30,7 +30,7 @@ boolean_param("mce_fb", mce_force_broadcast);
 static int __read_mostly nr_intel_ext_msrs;
 
 /* If mce_force_broadcast == 1, lmce_support will be disabled forcibly. */
-static bool __read_mostly lmce_support;
+bool __read_mostly lmce_support;
 
 /* Intel SDM define bit15~bit0 of IA32_MCi_STATUS as the MC error code */
 #define INTEL_MCCOD_MASK 0xFFFF
diff --git a/xen/arch/x86/cpu/mcheck/vmce.c b/xen/arch/x86/cpu/mcheck/vmce.c
index 9830835c5a..a34c3d38d1 100644
--- a/xen/arch/x86/cpu/mcheck/vmce.c
+++ b/xen/arch/x86/cpu/mcheck/vmce.c
@@ -74,7 +74,7 @@ int vmce_restore_vcpu(struct vcpu *v, const struct hvm_vmce_vcpu *ctxt)
     unsigned long guest_mcg_cap;
 
     if ( boot_cpu_data.x86_vendor == X86_VENDOR_INTEL )
-        guest_mcg_cap = INTEL_GUEST_MCG_CAP;
+        guest_mcg_cap = INTEL_GUEST_MCG_CAP | MCG_LMCE_P;
     else
         guest_mcg_cap = AMD_GUEST_MCG_CAP;
 
@@ -546,3 +546,20 @@ int unmmap_broken_page(struct domain *d, mfn_t mfn, unsigned long gfn)
     return rc;
 }
 
+int vmce_enable_mca_cap(struct domain *d, uint64_t cap)
+{
+    struct vcpu *v;
+
+    if ( cap & ~XEN_HVM_MCA_CAP_MASK )
+        return -EINVAL;
+
+    if ( cap & XEN_HVM_MCA_CAP_LMCE )
+    {
+        if ( !lmce_support )
+            return -EINVAL;
+        for_each_vcpu(d, v)
+            v->arch.vmce.mcg_cap |= MCG_LMCE_P;
+    }
+
+    return 0;
+}
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 70ddc81d44..fa72d1bd1d 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -3985,6 +3985,7 @@ static int hvm_allow_set_param(struct domain *d,
     case HVM_PARAM_IOREQ_SERVER_PFN:
     case HVM_PARAM_NR_IOREQ_SERVER_PAGES:
     case HVM_PARAM_ALTP2M:
+    case HVM_PARAM_MCA_CAP:
         if ( value != 0 && a->value != value )
             rc = -EEXIST;
         break;
@@ -4196,6 +4197,10 @@ static int hvmop_set_param(
                                                (0x10000 / 8) + 1) << 32);
         a.value |= VM86_TSS_UPDATED;
         break;
+
+    case HVM_PARAM_MCA_CAP:
+        rc = vmce_enable_mca_cap(d, a.value);
+        break;
     }
 
     if ( rc != 0 )
diff --git a/xen/include/asm-x86/mce.h b/xen/include/asm-x86/mce.h
index 35f9962638..d2933c91bf 100644
--- a/xen/include/asm-x86/mce.h
+++ b/xen/include/asm-x86/mce.h
@@ -38,6 +38,7 @@ extern int vmce_restore_vcpu(struct vcpu *, const struct hvm_vmce_vcpu *);
 extern int vmce_wrmsr(uint32_t msr, uint64_t val);
 extern int vmce_rdmsr(uint32_t msr, uint64_t *val);
 extern bool vmce_has_lmce(const struct vcpu *v);
+extern int vmce_enable_mca_cap(struct domain *d, uint64_t cap);
 
 extern unsigned int nr_mce_banks;
 
diff --git a/xen/include/public/hvm/params.h b/xen/include/public/hvm/params.h
index 1f3ed0906d..2ec2e7c80f 100644
--- a/xen/include/public/hvm/params.h
+++ b/xen/include/public/hvm/params.h
@@ -274,6 +274,11 @@
  */
 #define HVM_PARAM_VM86_TSS_SIZED 37
 
-#define HVM_NR_PARAMS 38
+/* Enable MCA capabilities. */
+#define HVM_PARAM_MCA_CAP 38
+#define XEN_HVM_MCA_CAP_LMCE   (xen_mk_ullong(1) << 0)
+#define XEN_HVM_MCA_CAP_MASK   XEN_HVM_MCA_CAP_LMCE
+
+#define HVM_NR_PARAMS 39
 
 #endif /* __XEN_PUBLIC_HVM_PARAMS_H__ */
-- 
2.11.0


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