[xen staging] Revert "xen/domctl: Introduce XEN_DOMCTL_CDF_vpci flag"

[patchbot@xxxxxxx]

commit 9516d01ac3015f522528ed6dafb3f584eaa7ed2c
Author:     Michal Orzel <michal.orzel@xxxxxxx>
AuthorDate: Thu Oct 14 10:47:18 2021 +0200
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Thu Oct 14 10:08:07 2021 +0000

    Revert "xen/domctl: Introduce XEN_DOMCTL_CDF_vpci flag"
    
    This reverts commit 2075b410ee8087662c880213c3aca196fb7ade22.
    
    During the discussion [1] that took place after
    the patch was merged it was agreed that it should
    be reverted to avoid introducing a bad interface.
    
    Furthermore, the patch rejected usage of flag
    XEN_DOMCTL_CDF_vpci for x86 which is not true
    as it should be set for dom0 PVH.
    
    Due to XEN_DOMCTL_CDF_vpmu being introduced after
    XEN_DOMCTL_CDF_vpci, modify its bit position
    from 8 to 7.
    
    [1] https://marc.info/?t=163354215300039&r=1&w=2
    
    Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Christian Lindig 
<christian.lindig@xxxxxxxxxx<mailto:christian.lindig@xxxxxxxxxx>>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
---
 tools/ocaml/libs/xc/xenctrl.ml  | 1 -
 tools/ocaml/libs/xc/xenctrl.mli | 1 -
 xen/arch/arm/domain.c           | 3 +--
 xen/arch/x86/domain.c           | 6 ------
 xen/common/domain.c             | 3 +--
 xen/include/public/domctl.h     | 3 +--
 6 files changed, 3 insertions(+), 14 deletions(-)

diff --git a/tools/ocaml/libs/xc/xenctrl.ml b/tools/ocaml/libs/xc/xenctrl.ml
index 86758babb3..addcf4cc59 100644
--- a/tools/ocaml/libs/xc/xenctrl.ml
+++ b/tools/ocaml/libs/xc/xenctrl.ml
@@ -69,7 +69,6 @@ type domain_create_flag =
        | CDF_XS_DOMAIN
        | CDF_IOMMU
        | CDF_NESTED_VIRT
-       | CDF_VPCI
        | CDF_VPMU
 
 type domain_create_iommu_opts =
diff --git a/tools/ocaml/libs/xc/xenctrl.mli b/tools/ocaml/libs/xc/xenctrl.mli
index 0fdb0cc169..0a5ce529e9 100644
--- a/tools/ocaml/libs/xc/xenctrl.mli
+++ b/tools/ocaml/libs/xc/xenctrl.mli
@@ -62,7 +62,6 @@ type domain_create_flag =
   | CDF_XS_DOMAIN
   | CDF_IOMMU
   | CDF_NESTED_VIRT
-  | CDF_VPCI
   | CDF_VPMU
 
 type domain_create_iommu_opts =
diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index ad21c9b950..eef0661beb 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -628,8 +628,7 @@ int arch_sanitise_domain_config(struct 
xen_domctl_createdomain *config)
 {
     unsigned int max_vcpus;
     unsigned int flags_required = (XEN_DOMCTL_CDF_hvm | XEN_DOMCTL_CDF_hap);
-    unsigned int flags_optional = (XEN_DOMCTL_CDF_iommu | XEN_DOMCTL_CDF_vpci |
-                                   XEN_DOMCTL_CDF_vpmu);
+    unsigned int flags_optional = (XEN_DOMCTL_CDF_iommu | XEN_DOMCTL_CDF_vpmu);
 
     if ( (config->flags & ~flags_optional) != flags_required )
     {
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 79c2aa4636..ef1812dc14 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -662,12 +662,6 @@ int arch_sanitise_domain_config(struct 
xen_domctl_createdomain *config)
         return -EINVAL;
     }
 
-    if ( config->flags & XEN_DOMCTL_CDF_vpci )
-    {
-        dprintk(XENLOG_INFO, "vPCI cannot be enabled yet\n");
-        return -EINVAL;
-    }
-
     if ( config->vmtrace_size )
     {
         unsigned int size = config->vmtrace_size;
diff --git a/xen/common/domain.c b/xen/common/domain.c
index 8543fb54fd..8b53c49d1e 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -486,8 +486,7 @@ static int sanitise_domain_config(struct 
xen_domctl_createdomain *config)
          ~(XEN_DOMCTL_CDF_hvm | XEN_DOMCTL_CDF_hap |
            XEN_DOMCTL_CDF_s3_integrity | XEN_DOMCTL_CDF_oos_off |
            XEN_DOMCTL_CDF_xs_domain | XEN_DOMCTL_CDF_iommu |
-           XEN_DOMCTL_CDF_nested_virt | XEN_DOMCTL_CDF_vpci |
-           XEN_DOMCTL_CDF_vpmu) )
+           XEN_DOMCTL_CDF_nested_virt | XEN_DOMCTL_CDF_vpmu) )
     {
         dprintk(XENLOG_INFO, "Unknown CDF flags %#x\n", config->flags);
         return -EINVAL;
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index a53cbd16f4..238384b5ae 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -70,9 +70,8 @@ struct xen_domctl_createdomain {
 #define XEN_DOMCTL_CDF_iommu          (1U<<_XEN_DOMCTL_CDF_iommu)
 #define _XEN_DOMCTL_CDF_nested_virt   6
 #define XEN_DOMCTL_CDF_nested_virt    (1U << _XEN_DOMCTL_CDF_nested_virt)
-#define XEN_DOMCTL_CDF_vpci           (1U << 7)
 /* Should we expose the vPMU to the guest? */
-#define XEN_DOMCTL_CDF_vpmu           (1U << 8)
+#define XEN_DOMCTL_CDF_vpmu           (1U << 7)
 
 /* Max XEN_DOMCTL_CDF_* constant.  Used for ABI checking. */
 #define XEN_DOMCTL_CDF_MAX XEN_DOMCTL_CDF_vpmu
--
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