linux-kernel - [PATCH] KVM-Use value reading from MSR when construct the eptp in VMX mode

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Date:	Sun, 24 Aug 2014 11:54:32 +0800
From:	Dennis Chen <kernel.org.gnu@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	avi@...ranet.com, yaniv@...ranet.com, gleb@...nel.org,
	wanpeng.li@...ux.intel.com, Dennis Chen <kernel.org.gnu@...il.com>
Subject: [PATCH] KVM-Use value reading from MSR when construct the eptp in VMX mode

This patch is used to construct the eptp in vmx mode with values
readed from MSR according to the intel x86 software developer's
manual.

Signed-off-by: Dennis Chen <kernel.org.gnu@...il.com>
---
 arch/x86/include/asm/vmx.h |    1 +
 arch/x86/kvm/vmx.c         |   21 +++++++++++++++++----
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index bcbfade..bf82a77 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -417,6 +417,7 @@ enum vmcs_field {
 #define VMX_EPT_GAW_EPTP_SHIFT            3
 #define VMX_EPT_AD_ENABLE_BIT            (1ull << 6)
 #define VMX_EPT_DEFAULT_MT            0x6ull
+#define VMX_EPT_UC_MT                0x0ull
 #define VMX_EPT_READABLE_MASK            0x1ull
 #define VMX_EPT_WRITABLE_MASK            0x2ull
 #define VMX_EPT_EXECUTABLE_MASK            0x4ull
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index bfe11cf..7add5ce 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3477,11 +3477,24 @@ static void vmx_set_cr0(struct kvm_vcpu *vcpu,
unsigned long cr0)

 static u64 construct_eptp(unsigned long root_hpa)
 {
-    u64 eptp;
+    u64 eptp, pwl;
+
+    if (cpu_has_vmx_ept_4levels())
+        pwl = VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
+    else {
+        WARN(1, "Unsupported page-walk length of 4.\n");
+        BUG();
+    }
+
+    if (cpu_has_vmx_eptp_writeback())
+        eptp = VMX_EPT_DEFAULT_MT | pwl;
+    else if (cpu_has_vmx_eptp_uncacheable())
+        eptp = VMX_EPT_UC_MT | pwl;
+    else {
+        WARN(1, "Unsupported memory type config in vmx eptp.\n");
+        BUG();
+    }

-    /* TODO write the value reading from MSR */
-    eptp = VMX_EPT_DEFAULT_MT |
-        VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
     if (enable_ept_ad_bits)
         eptp |= VMX_EPT_AD_ENABLE_BIT;
     eptp |= (root_hpa & PAGE_MASK);
-- 
1.7.9.5
--
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