[Xen-devel] [PATCH V5 2/6] x86/hvm: pkeys, add pkeys support when setting CR4

[Huaitong Han <huaitong.han@xxxxxxxxx>]

CR4.PKE(bit 22) enables support for the RDPKRU/WRPKRU instructions to access 
PKRU and
the protection keys check (a page fault trigger).

This patch adds X86_CR4_PKE to hvm_cr4_guest_reserved_bits so that CR4 check 
works
before setting.

Signed-off-by: Huaitong Han <huaitong.han@xxxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index db0aeba..59916ed 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1924,6 +1924,7 @@ static unsigned long hvm_cr4_guest_reserved_bits(const 
struct vcpu *v,
         leaf1_edx = 
boot_cpu_data.x86_capability[cpufeat_word(X86_FEATURE_VME)];
         leaf1_ecx = 
boot_cpu_data.x86_capability[cpufeat_word(X86_FEATURE_PCID)];
         leaf7_0_ebx = 
boot_cpu_data.x86_capability[cpufeat_word(X86_FEATURE_FSGSBASE)];
+        leaf7_0_ecx = 
boot_cpu_data.x86_capability[cpufeat_word(X86_FEATURE_PKU)];
     }
 
     return ~(unsigned long)
@@ -1959,7 +1960,9 @@ 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)
-- 
2.4.3


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