viridian: use viridian_map/unmap_guest_page() for reference tsc page

Whilst the reference tsc page does not currently need to be kept mapped
after it is initially set up (or updated after migrate), the code can
be simplified by using the common guest page map/unmap and dump functions.
New functionality added by a subsequent patch will also require the page to
kept mapped for the lifetime of the domain.

NOTE: Because the reference tsc page is per-domain rather than per-vcpu
      this patch also changes viridian_map_guest_page() to take a domain
      pointer rather than a vcpu pointer. The domain pointer cannot be
      const, unlike the vcpu pointer.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: "Roger Pau Monné" <roger.pau@citrix.com>

diff --git a/xen/arch/x86/hvm/viridian/private.h b/xen/arch/x86/hvm/viridian/private.h
index 5078b2d2ab22b8c07cc49d266259d74a30453543..96a784b84000e6e9aaae213a0d3717319675950b 100644 (file)
--- a/xen/arch/x86/hvm/viridian/private.h
+++ b/xen/arch/x86/hvm/viridian/private.h
@@ -111,7 +111,7 @@ void viridian_time_load_domain_ctxt(
 
 void viridian_dump_guest_page(const struct vcpu *v, const char *name,
                               const struct viridian_page *vp);
-void viridian_map_guest_page(const struct vcpu *v, struct viridian_page *vp);
+void viridian_map_guest_page(struct domain *d, struct viridian_page *vp);
 void viridian_unmap_guest_page(struct viridian_page *vp);
 
 #endif /* X86_HVM_VIRIDIAN_PRIVATE_H */

diff --git a/xen/arch/x86/hvm/viridian/synic.c b/xen/arch/x86/hvm/viridian/synic.c
index b8dab4b246604beb9abf6a148b9e82642c219e13..fb560bc1623d008d93ebb3ed1ee89716e2f41aa1 100644 (file)
--- a/xen/arch/x86/hvm/viridian/synic.c
+++ b/xen/arch/x86/hvm/viridian/synic.c
@@ -81,6 +81,7 @@ void viridian_apic_assist_clear(const struct vcpu *v)
 int viridian_synic_wrmsr(struct vcpu *v, uint32_t idx, uint64_t val)
 {
     struct viridian_vcpu *vv = v->arch.hvm.viridian;
+    struct domain *d = v->domain;
 
     switch ( idx )
     {
@@ -103,7 +104,7 @@ int viridian_synic_wrmsr(struct vcpu *v, uint32_t idx, uint64_t val)
         vv->vp_assist.msr.raw = val;
         viridian_dump_guest_page(v, "VP_ASSIST", &vv->vp_assist);
         if ( vv->vp_assist.msr.enabled )
-            viridian_map_guest_page(v, &vv->vp_assist);
+            viridian_map_guest_page(d, &vv->vp_assist);
         break;
 
     default:
@@ -178,10 +179,11 @@ void viridian_synic_load_vcpu_ctxt(
     struct vcpu *v, const struct hvm_viridian_vcpu_context *ctxt)
 {
     struct viridian_vcpu *vv = v->arch.hvm.viridian;
+    struct domain *d = v->domain;
 
     vv->vp_assist.msr.raw = ctxt->vp_assist_msr;
     if ( vv->vp_assist.msr.enabled )
-        viridian_map_guest_page(v, &vv->vp_assist);
+        viridian_map_guest_page(d, &vv->vp_assist);
 
     vv->apic_assist_pending = ctxt->apic_assist_pending;
 }

diff --git a/xen/arch/x86/hvm/viridian/time.c b/xen/arch/x86/hvm/viridian/time.c
index 4399e62f542353a37202112c9cb4d159f2840fc4..16fe41d411e79a63d08a724e8fb440f2c497db26 100644 (file)
--- a/xen/arch/x86/hvm/viridian/time.c
+++ b/xen/arch/x86/hvm/viridian/time.c
@@ -25,33 +25,10 @@ typedef struct _HV_REFERENCE_TSC_PAGE
     uint64_t Reserved2[509];
 } HV_REFERENCE_TSC_PAGE, *PHV_REFERENCE_TSC_PAGE;
 
-static void dump_reference_tsc(const struct domain *d)
-{
-    const union viridian_page_msr *rt = &d->arch.hvm.viridian->reference_tsc;
-
-    if ( !rt->enabled )
-        return;
-
-    printk(XENLOG_G_INFO "d%d: VIRIDIAN REFERENCE_TSC: pfn: %lx\n",
-           d->domain_id, (unsigned long)rt->pfn);
-}
-
 static void update_reference_tsc(struct domain *d, bool initialize)
 {
-    unsigned long gmfn = d->arch.hvm.viridian->reference_tsc.pfn;
-    struct page_info *page = get_page_from_gfn(d, gmfn, NULL, P2M_ALLOC);
-    HV_REFERENCE_TSC_PAGE *p;
-
-    if ( !page || !get_page_type(page, PGT_writable_page) )
-    {
-        if ( page )
-            put_page(page);
-        gdprintk(XENLOG_WARNING, "Bad GMFN %#"PRI_gfn" (MFN %#"PRI_mfn")\n",
-                 gmfn, mfn_x(page ? page_to_mfn(page) : INVALID_MFN));
-        return;
-    }
-
-    p = __map_domain_page(page);
+    const struct viridian_page *rt = &d->arch.hvm.viridian->reference_tsc;
+    HV_REFERENCE_TSC_PAGE *p = rt->ptr;
 
     if ( initialize )
         clear_page(p);
@@ -82,7 +59,7 @@ static void update_reference_tsc(struct domain *d, bool initialize)
 
         printk(XENLOG_G_INFO "d%d: VIRIDIAN REFERENCE_TSC: invalidated\n",
                d->domain_id);
-        goto out;
+        return;
     }
 
     /*
@@ -100,11 +77,6 @@ static void update_reference_tsc(struct domain *d, bool initialize)
     if ( p->TscSequence == 0xFFFFFFFF ||
          p->TscSequence == 0 ) /* Avoid both 'invalid' values */
         p->TscSequence = 1;
-
- out:
-    unmap_domain_page(p);
-
-    put_page_and_type(page);
 }
 
 static int64_t raw_trc_val(const struct domain *d)
@@ -149,10 +121,14 @@ int viridian_time_wrmsr(struct vcpu *v, uint32_t idx, uint64_t val)
         if ( !(viridian_feature_mask(d) & HVMPV_reference_tsc) )
             return X86EMUL_EXCEPTION;
 
-        vd->reference_tsc.raw = val;
-        dump_reference_tsc(d);
-        if ( vd->reference_tsc.enabled )
+        viridian_unmap_guest_page(&vd->reference_tsc);
+        vd->reference_tsc.msr.raw = val;
+        viridian_dump_guest_page(v, "REFERENCE_TSC", &vd->reference_tsc);
+        if ( vd->reference_tsc.msr.enabled )
+        {
+            viridian_map_guest_page(d, &vd->reference_tsc);
             update_reference_tsc(d, true);
+        }
         break;
 
     default:
@@ -189,7 +165,7 @@ int viridian_time_rdmsr(const struct vcpu *v, uint32_t idx, uint64_t *val)
         if ( !(viridian_feature_mask(d) & HVMPV_reference_tsc) )
             return X86EMUL_EXCEPTION;
 
-        *val = vd->reference_tsc.raw;
+        *val = vd->reference_tsc.msr.raw;
         break;
 
     case HV_X64_MSR_TIME_REF_COUNT:
@@ -231,6 +207,7 @@ void viridian_time_vcpu_deinit(const struct vcpu *v)
 
 void viridian_time_domain_deinit(const struct domain *d)
 {
+    viridian_unmap_guest_page(&d->arch.hvm.viridian->reference_tsc);
 }
 
 void viridian_time_save_vcpu_ctxt(
@@ -249,7 +226,7 @@ void viridian_time_save_domain_ctxt(
     const struct viridian_domain *vd = d->arch.hvm.viridian;
 
     ctxt->time_ref_count = vd->time_ref_count.val;
-    ctxt->reference_tsc = vd->reference_tsc.raw;
+    ctxt->reference_tsc = vd->reference_tsc.msr.raw;
 }
 
 void viridian_time_load_domain_ctxt(
@@ -258,10 +235,13 @@ void viridian_time_load_domain_ctxt(
     struct viridian_domain *vd = d->arch.hvm.viridian;
 
     vd->time_ref_count.val = ctxt->time_ref_count;
-    vd->reference_tsc.raw = ctxt->reference_tsc;
+    vd->reference_tsc.msr.raw = ctxt->reference_tsc;
 
-    if ( vd->reference_tsc.enabled )
+    if ( vd->reference_tsc.msr.enabled )
+    {
+        viridian_map_guest_page(d, &vd->reference_tsc);
         update_reference_tsc(d, false);
+    }
 }
 
 /*

diff --git a/xen/arch/x86/hvm/viridian/viridian.c b/xen/arch/x86/hvm/viridian/viridian.c
index 742a988252d2eea4246ba018fc03a66c36c4a07a..2b045ed88f0bff137a5f7919804c9899b22b885d 100644 (file)
--- a/xen/arch/x86/hvm/viridian/viridian.c
+++ b/xen/arch/x86/hvm/viridian/viridian.c
@@ -644,9 +644,8 @@ void viridian_dump_guest_page(const struct vcpu *v, const char *name,
            v, name, (unsigned long)vp->msr.pfn);
 }
 
-void viridian_map_guest_page(const struct vcpu *v, struct viridian_page *vp)
+void viridian_map_guest_page(struct domain *d, struct viridian_page *vp)
 {
-    struct domain *d = v->domain;
     unsigned long gmfn = vp->msr.pfn;
     struct page_info *page;
 

diff --git a/xen/include/asm-x86/hvm/viridian.h b/xen/include/asm-x86/hvm/viridian.h
index abbbb360926df02c77c32d0b9a33b43061d6c052..c65c044191c181d9df14d8c5dd0cb3f312ee5c42 100644 (file)
--- a/xen/include/asm-x86/hvm/viridian.h
+++ b/xen/include/asm-x86/hvm/viridian.h
@@ -65,7 +65,7 @@ struct viridian_domain
     union viridian_guest_os_id_msr guest_os_id;
     union viridian_page_msr hypercall_gpa;
     struct viridian_time_ref_count time_ref_count;
-    union viridian_page_msr reference_tsc;
+    struct viridian_page reference_tsc;
 };
 
 void cpuid_viridian_leaves(const struct vcpu *v, uint32_t leaf,