[Xen-devel] [PATCH 04/10] x86/hvm: pkeys, add pkeys support when setting CR4

[Huaitong Han <huaitong.han@xxxxxxxxx>]

This patch adds pkeys support when setting CR4

Signed-off-by: Huaitong Han <huaitong.han@xxxxxxxxx>

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 66917ff..953047f 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1911,6 +1911,7 @@ static unsigned long hvm_cr4_guest_reserved_bits(const 
struct vcpu *v,
         leaf1_edx = boot_cpu_data.x86_capability[X86_FEATURE_VME / 32];
         leaf1_ecx = boot_cpu_data.x86_capability[X86_FEATURE_PCID / 32];
         leaf7_0_ebx = boot_cpu_data.x86_capability[X86_FEATURE_FSGSBASE / 32];
+        leaf7_0_ecx = boot_cpu_data.x86_capability[X86_FEATURE_PKU / 32];
     }
 
     return ~(unsigned long)
@@ -1946,7 +1947,9 @@ static unsigned long hvm_cr4_guest_reserved_bits(const 
struct vcpu *v,
              (leaf7_0_ebx & cpufeat_mask(X86_FEATURE_SMEP) ?
               X86_CR4_SMEP : 0) |
              (leaf7_0_ebx & cpufeat_mask(X86_FEATURE_SMAP) ?
-              X86_CR4_SMAP : 0));
+              X86_CR4_SMAP : 0) |
+             (leaf7_0_ecx & cpufeat_mask(X86_FEATURE_PKU) ?
+              X86_CR4_PKE : 0));
 }
 
 static int hvm_load_cpu_ctxt(struct domain *d, hvm_domain_context_t *h)
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index c1f924e..8101a1b 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1310,6 +1310,8 @@ void __init noreturn __start_xen(unsigned long mbi_p)
 
     if ( disable_pku )
         setup_clear_cpu_cap(X86_FEATURE_PKU);
+    if ( cpu_has_pku )
+        set_in_cr4(X86_CR4_PKE);
 
     if ( cpu_has_fsgsbase )
         set_in_cr4(X86_CR4_FSGSBASE);
-- 
2.4.3


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