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.

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 1864bab3d5e935c0ca23a23bde5e72eebb9e8e3b..0bf34eefe0a6b812c31716b643bf0dbd3c401668 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(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 5707b79d999a10f0f8c73dcd1d725bea9804fb87..35bd2125fc156af6166b4171987801a1994b9620 100644 (file)
--- a/xen/arch/x86/hvm/viridian/synic.c
+++ b/xen/arch/x86/hvm/viridian/synic.c
@@ -78,6 +78,8 @@ void viridian_apic_assist_clear(struct vcpu *v)
 
 int viridian_synic_wrmsr(struct vcpu *v, uint32_t idx, uint64_t val)
 {
+    struct domain *d = v->domain;
+
     switch ( idx )
     {
     case HV_X64_MSR_EOI:
@@ -100,7 +102,7 @@ int viridian_synic_wrmsr(struct vcpu *v, uint32_t idx, uint64_t val)
         viridian_dump_guest_page(v, "VP_ASSIST",
                                  &v->arch.hvm.viridian->vp_assist);
         if ( v->arch.hvm.viridian->vp_assist.msr.fields.enabled )
-            viridian_map_guest_page(v, &v->arch.hvm.viridian->vp_assist);
+            viridian_map_guest_page(d, &v->arch.hvm.viridian->vp_assist);
         break;
 
     default:
@@ -172,9 +174,11 @@ void viridian_synic_save_vcpu_ctxt(const struct vcpu *v,
 void viridian_synic_load_vcpu_ctxt(
     struct vcpu *v, const struct hvm_viridian_vcpu_context *ctxt)
 {
+    struct domain *d = v->domain;
+
     v->arch.hvm.viridian->vp_assist.msr.raw = ctxt->vp_assist_msr;
     if ( v->arch.hvm.viridian->vp_assist.msr.fields.enabled )
-        viridian_map_guest_page(v, &v->arch.hvm.viridian->vp_assist);
+        viridian_map_guest_page(d, &v->arch.hvm.viridian->vp_assist);
 
     v->arch.hvm.viridian->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 9225bdf9ab78c10a8b028eaca522a71501658cc7..e8924adfa191895373bf0c3b2183f52033e88d8f 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->fields.enabled )
-        return;
-
-    printk(XENLOG_G_INFO "d%d: VIRIDIAN REFERENCE_TSC: pfn: %lx\n",
-           d->domain_id, (unsigned long)rt->fields.pfn);
-}
-
 static void update_reference_tsc(struct domain *d, bool initialize)
 {
-    unsigned long gmfn = d->arch.hvm.viridian->reference_tsc.fields.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(struct domain *d)
@@ -148,10 +120,15 @@ int viridian_time_wrmsr(struct vcpu *v, uint32_t idx, uint64_t val)
         if ( !(viridian_feature_mask(d) & HVMPV_reference_tsc) )
             return X86EMUL_EXCEPTION;
 
-        d->arch.hvm.viridian->reference_tsc.raw = val;
-        dump_reference_tsc(d);
-        if ( d->arch.hvm.viridian->reference_tsc.fields.enabled )
+        viridian_unmap_guest_page(&d->arch.hvm.viridian->reference_tsc);
+        d->arch.hvm.viridian->reference_tsc.msr.raw = val;
+        viridian_dump_guest_page(v, "REFERENCE_TSC",
+                                 &d->arch.hvm.viridian->reference_tsc);
+        if ( d->arch.hvm.viridian->reference_tsc.msr.fields.enabled )
+        {
+            viridian_map_guest_page(d, &d->arch.hvm.viridian->reference_tsc);
             update_reference_tsc(d, true);
+        }
         break;
 
     default:
@@ -187,7 +164,7 @@ 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 = d->arch.hvm.viridian->reference_tsc.raw;
+        *val = d->arch.hvm.viridian->reference_tsc.msr.raw;
         break;
 
     case HV_X64_MSR_TIME_REF_COUNT:
@@ -230,6 +207,7 @@ void viridian_time_vcpu_deinit(struct vcpu *v)
 
 void viridian_time_domain_deinit(struct domain *d)
 {
+    viridian_unmap_guest_page(&d->arch.hvm.viridian->reference_tsc);
 }
 
 void viridian_time_save_vcpu_ctxt(
@@ -246,17 +224,20 @@ void viridian_time_save_domain_ctxt(
     const struct domain *d, struct hvm_viridian_domain_context *ctxt)
 {
     ctxt->time_ref_count = d->arch.hvm.viridian->time_ref_count.val;
-    ctxt->reference_tsc = d->arch.hvm.viridian->reference_tsc.raw;
+    ctxt->reference_tsc = d->arch.hvm.viridian->reference_tsc.msr.raw;
 }
 
 void viridian_time_load_domain_ctxt(
     struct domain *d, const struct hvm_viridian_domain_context *ctxt)
 {
     d->arch.hvm.viridian->time_ref_count.val = ctxt->time_ref_count;
-    d->arch.hvm.viridian->reference_tsc.raw = ctxt->reference_tsc;
+    d->arch.hvm.viridian->reference_tsc.msr.raw = ctxt->reference_tsc;
 
-    if ( d->arch.hvm.viridian->reference_tsc.fields.enabled )
+    if ( d->arch.hvm.viridian->reference_tsc.msr.fields.enabled )
+    {
+        viridian_map_guest_page(d, &d->arch.hvm.viridian->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 157d9f48b27ce3a0bb199448df93d926460ff0aa..020221276792d430badab8370c80815e98613f7a 100644 (file)
--- a/xen/arch/x86/hvm/viridian/viridian.c
+++ b/xen/arch/x86/hvm/viridian/viridian.c
@@ -662,9 +662,8 @@ void viridian_dump_guest_page(const struct vcpu *v, const char *name,
            v, name, (unsigned long)vp->msr.fields.pfn);
 }
 
-void viridian_map_guest_page(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.fields.pfn;
     struct page_info *page;
 

diff --git a/xen/include/asm-x86/hvm/viridian.h b/xen/include/asm-x86/hvm/viridian.h
index f072838955885072820b962e3b232a4b8ac131bd..1d281d825ee459e87f2cfee41b4cf3324c5fa637 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,