[Xen-changelog] [xen-unstable] Fix save/restore of guest PAT table in HAP paging mode.

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Gianluca Guida <gianluca.guida@xxxxxxxxxx>
# Date 1334647766 -3600
# Node ID 375fa55c7a6c88273bdd1f7f1105e5154da4eeba
# Parent  a06e6cdeafe34964721df3ddb32774d4634fd7ad
Fix save/restore of guest PAT table in HAP paging mode.

HAP paging mode guests use direct MSR read/write into the VMCS/VMCB
for the guest PAT table, while the current save/restore code was
accessing only the pat_cr field in hvm_vcpu, used when intercepting
the MSR mostly in shadow mode (the Intel scenario is a bit more
complicated).  This patch fixes this issue creating a new couple of
hvm_funcs, get/set_guest_pat, that access the right PAT table based on
the paging mode and guest configuration.

Signed-off-by: Gianluca Guida <gianluca.guida@xxxxxxxxxx>
Acked-by: Tim Deegan <tim@xxxxxxx>
Committed-by: Keir Fraser <keir@xxxxxxx>
---


diff -r a06e6cdeafe3 -r 375fa55c7a6c xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c    Mon Apr 16 13:05:28 2012 +0200
+++ b/xen/arch/x86/hvm/hvm.c    Tue Apr 17 08:29:26 2012 +0100
@@ -216,6 +216,31 @@ void hvm_set_rdtsc_exiting(struct domain
         hvm_funcs.set_rdtsc_exiting(v, enable);
 }
 
+void hvm_get_guest_pat(struct vcpu *v, u64 *guest_pat)
+{
+    if ( !hvm_funcs.get_guest_pat(v, guest_pat) )
+        *guest_pat = v->arch.hvm_vcpu.pat_cr;
+}
+
+int hvm_set_guest_pat(struct vcpu *v, u64 guest_pat)
+{
+    int i;
+    uint8_t *value = (uint8_t *)&guest_pat;
+
+    for ( i = 0; i < 8; i++ )
+        if ( unlikely(!(value[i] == 0 || value[i] == 1 ||
+                        value[i] == 4 || value[i] == 5 ||
+                        value[i] == 6 || value[i] == 7)) ) {
+            HVM_DBG_LOG(DBG_LEVEL_MSR, "invalid guest PAT: %"PRIx64"\n",
+                        guest_pat); 
+            return 0;
+        }
+
+    if ( !hvm_funcs.set_guest_pat(v, guest_pat) )
+        v->arch.hvm_vcpu.pat_cr = guest_pat;
+    return 1;
+}
+
 void hvm_set_guest_tsc(struct vcpu *v, u64 guest_tsc)
 {
     uint64_t tsc;
@@ -2796,7 +2821,7 @@ int hvm_msr_read_intercept(unsigned int 
         break;
 
     case MSR_IA32_CR_PAT:
-        *msr_content = v->arch.hvm_vcpu.pat_cr;
+        hvm_get_guest_pat(v, msr_content);
         break;
 
     case MSR_MTRRcap:
@@ -2912,7 +2937,7 @@ int hvm_msr_write_intercept(unsigned int
         break;
 
     case MSR_IA32_CR_PAT:
-        if ( !pat_msr_set(&v->arch.hvm_vcpu.pat_cr, msr_content) )
+        if ( !hvm_set_guest_pat(v, msr_content) )
            goto gp_fault;
         break;
 
diff -r a06e6cdeafe3 -r 375fa55c7a6c xen/arch/x86/hvm/mtrr.c
--- a/xen/arch/x86/hvm/mtrr.c   Mon Apr 16 13:05:28 2012 +0200
+++ b/xen/arch/x86/hvm/mtrr.c   Tue Apr 17 08:29:26 2012 +0100
@@ -403,26 +403,6 @@ uint32_t get_pat_flags(struct vcpu *v,
     return pat_type_2_pte_flags(pat_entry_value);
 }
 
-/* Helper funtions for seting mtrr/pat */
-bool_t pat_msr_set(uint64_t *pat, uint64_t msr_content)
-{
-    uint8_t *value = (uint8_t*)&msr_content;
-    int32_t i;
-
-    if ( *pat != msr_content )
-    {
-        for ( i = 0; i < 8; i++ )
-            if ( unlikely(!(value[i] == 0 || value[i] == 1 ||
-                            value[i] == 4 || value[i] == 5 ||
-                            value[i] == 6 || value[i] == 7)) )
-                return 0;
-
-        *pat = msr_content;
-    }
-
-    return 1;
-}
-
 bool_t mtrr_def_type_msr_set(struct mtrr_state *m, uint64_t msr_content)
 {
     uint8_t def_type = msr_content & 0xff;
@@ -631,7 +611,7 @@ static int hvm_save_mtrr_msr(struct doma
     {
         mtrr_state = &v->arch.hvm_vcpu.mtrr;
 
-        hw_mtrr.msr_pat_cr = v->arch.hvm_vcpu.pat_cr;
+        hvm_get_guest_pat(v, &hw_mtrr.msr_pat_cr);
 
         hw_mtrr.msr_mtrr_def_type = mtrr_state->def_type
                                 | (mtrr_state->enabled << 10);
@@ -677,7 +657,7 @@ static int hvm_load_mtrr_msr(struct doma
 
     mtrr_state = &v->arch.hvm_vcpu.mtrr;
 
-    pat_msr_set(&v->arch.hvm_vcpu.pat_cr, hw_mtrr.msr_pat_cr);
+    hvm_set_guest_pat(v, hw_mtrr.msr_pat_cr);
 
     mtrr_state->mtrr_cap = hw_mtrr.msr_mtrr_cap;
 
diff -r a06e6cdeafe3 -r 375fa55c7a6c xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c        Mon Apr 16 13:05:28 2012 +0200
+++ b/xen/arch/x86/hvm/svm/svm.c        Tue Apr 17 08:29:26 2012 +0100
@@ -645,6 +645,28 @@ static void svm_set_segment_register(str
         svm_vmload(vmcb);
 }
 
+static int svm_set_guest_pat(struct vcpu *v, u64 gpat)
+{
+    struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
+
+    if ( !paging_mode_hap(v->domain) )
+        return 0;
+
+    vmcb_set_g_pat(vmcb, gpat);
+    return 1;
+}
+
+static int svm_get_guest_pat(struct vcpu *v, u64 *gpat)
+{
+    struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
+
+    if ( !paging_mode_hap(v->domain) )
+        return 0;
+
+    *gpat = vmcb_get_g_pat(vmcb);
+    return 1;
+}
+
 static uint64_t svm_get_tsc_offset(uint64_t host_tsc, uint64_t guest_tsc,
     uint64_t ratio)
 {
@@ -1964,6 +1986,8 @@ static struct hvm_function_table __read_
     .update_host_cr3      = svm_update_host_cr3,
     .update_guest_cr      = svm_update_guest_cr,
     .update_guest_efer    = svm_update_guest_efer,
+    .set_guest_pat        = svm_set_guest_pat,
+    .get_guest_pat        = svm_get_guest_pat,
     .set_tsc_offset       = svm_set_tsc_offset,
     .inject_exception     = svm_inject_exception,
     .init_hypercall_page  = svm_init_hypercall_page,
diff -r a06e6cdeafe3 -r 375fa55c7a6c xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c        Mon Apr 16 13:05:28 2012 +0200
+++ b/xen/arch/x86/hvm/vmx/vmx.c        Tue Apr 17 08:29:26 2012 +0100
@@ -942,6 +942,34 @@ static void vmx_set_segment_register(str
     vmx_vmcs_exit(v);
 }
 
+static int vmx_set_guest_pat(struct vcpu *v, u64 gpat)
+{
+    if ( !cpu_has_vmx_pat || !paging_mode_hap(v->domain) )
+        return 0;
+
+    vmx_vmcs_enter(v);
+    __vmwrite(GUEST_PAT, gpat);
+#ifdef __i386__
+    __vmwrite(GUEST_PAT_HIGH, gpat >> 32);
+#endif
+    vmx_vmcs_exit(v);
+    return 1;
+}
+
+static int vmx_get_guest_pat(struct vcpu *v, u64 *gpat)
+{
+    if ( !cpu_has_vmx_pat || !paging_mode_hap(v->domain) )
+        return 0;
+
+    vmx_vmcs_enter(v);
+    *gpat = __vmread(GUEST_PAT);
+#ifdef __i386__
+    *gpat |= (u64)__vmread(GUEST_PAT_HIGH) << 32;
+#endif
+    vmx_vmcs_exit(v);
+    return 1;
+}
+
 static void vmx_set_tsc_offset(struct vcpu *v, u64 offset)
 {
     vmx_vmcs_enter(v);
@@ -1486,6 +1514,8 @@ static struct hvm_function_table __read_
     .update_host_cr3      = vmx_update_host_cr3,
     .update_guest_cr      = vmx_update_guest_cr,
     .update_guest_efer    = vmx_update_guest_efer,
+    .set_guest_pat        = vmx_set_guest_pat,
+    .get_guest_pat        = vmx_get_guest_pat,
     .set_tsc_offset       = vmx_set_tsc_offset,
     .inject_exception     = vmx_inject_exception,
     .init_hypercall_page  = vmx_init_hypercall_page,
diff -r a06e6cdeafe3 -r 375fa55c7a6c xen/include/asm-x86/hvm/hvm.h
--- a/xen/include/asm-x86/hvm/hvm.h     Mon Apr 16 13:05:28 2012 +0200
+++ b/xen/include/asm-x86/hvm/hvm.h     Tue Apr 17 08:29:26 2012 +0100
@@ -118,6 +118,9 @@ struct hvm_function_table {
     void (*update_guest_cr)(struct vcpu *v, unsigned int cr);
     void (*update_guest_efer)(struct vcpu *v);
 
+    int  (*get_guest_pat)(struct vcpu *v, u64 *);
+    int  (*set_guest_pat)(struct vcpu *v, u64);
+
     void (*set_tsc_offset)(struct vcpu *v, u64 offset);
 
     void (*inject_exception)(unsigned int trapnr, int errcode,
@@ -200,6 +203,9 @@ void destroy_ring_for_helper(void **_va,
 
 bool_t hvm_send_assist_req(struct vcpu *v);
 
+void hvm_get_guest_pat(struct vcpu *v, u64 *guest_pat);
+int hvm_set_guest_pat(struct vcpu *v, u64 guest_pat);
+
 void hvm_set_guest_tsc(struct vcpu *v, u64 guest_tsc);
 u64 hvm_get_guest_tsc(struct vcpu *v);
 

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