[Xen-changelog] [xen stable-4.8] xen/x86: add some cr3 helpers

[patchbot@xxxxxxx]

commit 0954b1107dd527a8e36d69ad0274468012494de2
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Thu Apr 26 13:33:17 2018 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue May 29 10:19:40 2018 +0200

    xen/x86: add some cr3 helpers
    
    Add some helper macros to access the address and pcid parts of cr3.
    
    Use those helpers where appropriate.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/debug.c            |  2 +-
 xen/arch/x86/domain_page.c      |  2 +-
 xen/include/asm-x86/processor.h | 17 +++++++++++++++++
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/debug.c b/xen/arch/x86/debug.c
index 3030022b4e..32c87de757 100644
--- a/xen/arch/x86/debug.c
+++ b/xen/arch/x86/debug.c
@@ -99,7 +99,7 @@ dbg_pv_va2mfn(dbgva_t vaddr, struct domain *dp, uint64_t 
pgd3val)
     l2_pgentry_t l2e, *l2t;
     l1_pgentry_t l1e, *l1t;
     unsigned long cr3 = (pgd3val ? pgd3val : dp->vcpu[0]->arch.cr3);
-    mfn_t mfn = _mfn(cr3 >> PAGE_SHIFT);
+    mfn_t mfn = _mfn(paddr_to_pfn(cr3_pa(cr3)));
 
     DBGP2("vaddr:%lx domid:%d cr3:%lx pgd3:%lx\n", vaddr, dp->domain_id, 
           cr3, pgd3val);
diff --git a/xen/arch/x86/domain_page.c b/xen/arch/x86/domain_page.c
index d86f8feed6..28f5a5cc85 100644
--- a/xen/arch/x86/domain_page.c
+++ b/xen/arch/x86/domain_page.c
@@ -50,7 +50,7 @@ static inline struct vcpu *mapcache_current_vcpu(void)
         if ( (v = idle_vcpu[smp_processor_id()]) == current )
             sync_local_execstate();
         /* We must now be running on the idle page table. */
-        ASSERT(read_cr3() == __pa(idle_pg_table));
+        ASSERT(cr3_pa(read_cr3()) == __pa(idle_pg_table));
     }
 
     return v;
diff --git a/xen/include/asm-x86/processor.h b/xen/include/asm-x86/processor.h
index 1854f714f3..00f9d3ebb9 100644
--- a/xen/include/asm-x86/processor.h
+++ b/xen/include/asm-x86/processor.h
@@ -69,6 +69,13 @@
 #define X86_CR0_PG              0x80000000 /* Paging                   (RW) */
 
 /*
+ * Intel CPU flags in CR3
+ */
+#define X86_CR3_NOFLUSH    (_AC(1, ULL) << 63)
+#define X86_CR3_ADDR_MASK  (PAGE_MASK & PADDR_MASK)
+#define X86_CR3_PCID_MASK  _AC(0x0fff, ULL) /* Mask for PCID */
+
+/*
  * Intel CPU features in CR4
  */
 #define X86_CR4_VME        0x00000001 /* enable vm86 extensions */
@@ -346,6 +353,16 @@ static inline void write_cr3(unsigned long val)
     asm volatile ( "mov %0, %%cr3" : : "r" (val) : "memory" );
 }
 
+static inline unsigned long cr3_pa(unsigned long cr3)
+{
+    return cr3 & X86_CR3_ADDR_MASK;
+}
+
+static inline unsigned long cr3_pcid(unsigned long cr3)
+{
+    return cr3 & X86_CR3_PCID_MASK;
+}
+
 static inline unsigned long read_cr4(void)
 {
     return get_cpu_info()->cr4;
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.8

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