[Xen-changelog] [xen master] VMX: allow RTM advanced debugging to be used by guests

[patchbot@xxxxxxx]

commit 6df080467cde47d9ec5e81fde967567953619a25
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Aug 22 14:31:18 2014 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Aug 22 14:31:18 2014 +0200

    VMX: allow RTM advanced debugging to be used by guests
    
    All that is needed here is allowing the respective DebugCtl MSR bit to
    be set by the guest.
    
    At once - even if PV guests can't currently use it due to missing
    DebugCtl MSR virtualization - make the respective adjustments to
    debugreg.h.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmx.c      |    2 ++
 xen/include/asm-x86/debugreg.h  |    2 ++
 xen/include/asm-x86/msr-index.h |    1 +
 3 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index f2496c4..dc18a72 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -2246,6 +2246,8 @@ static int vmx_msr_write_intercept(unsigned int msr, 
uint64_t msr_content)
         int i, rc = 0;
         uint64_t supported = IA32_DEBUGCTLMSR_LBR | IA32_DEBUGCTLMSR_BTF;
 
+        if ( boot_cpu_has(X86_FEATURE_RTM) )
+            supported |= IA32_DEBUGCTLMSR_RTM;
         if ( msr_content & ~supported )
         {
             /* Perhaps some other bits are supported in vpmu. */
diff --git a/xen/include/asm-x86/debugreg.h b/xen/include/asm-x86/debugreg.h
index 62007bb..a5b2838 100644
--- a/xen/include/asm-x86/debugreg.h
+++ b/xen/include/asm-x86/debugreg.h
@@ -20,6 +20,7 @@
 #define DR_TRAP3        (0x8)           /* db3 */
 #define DR_STEP         (0x4000)        /* single-step */
 #define DR_SWITCH       (0x8000)        /* task switch */
+#define DR_NOT_RTM      (0x10000)       /* clear: #BP inside RTM region */
 
 /* Now define a bunch of things for manipulating the control register.
    The top two bytes of the control register consist of 4 fields of 4
@@ -62,6 +63,7 @@
 #define DR_CONTROL_RESERVED_ONE  (0x00000400ul) /* Reserved, read as one */
 #define DR_LOCAL_EXACT_ENABLE    (0x00000100ul) /* Local exact enable */
 #define DR_GLOBAL_EXACT_ENABLE   (0x00000200ul) /* Global exact enable */
+#define DR_RTM_ENABLE            (0x00000800ul) /* RTM debugging enable */
 #define DR_GENERAL_DETECT        (0x00002000ul) /* General detect enable */
 
 #define write_debugreg(reg, val) do {                       \
diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h
index 7247497..da732b7 100644
--- a/xen/include/asm-x86/msr-index.h
+++ b/xen/include/asm-x86/msr-index.h
@@ -79,6 +79,7 @@
 #define IA32_DEBUGCTLMSR_BTINT         (1<<8) /* Branch Trace Interrupt */
 #define IA32_DEBUGCTLMSR_BTS_OFF_OS    (1<<9)  /* BTS off if CPL 0 */
 #define IA32_DEBUGCTLMSR_BTS_OFF_USR   (1<<10) /* BTS off if CPL > 0 */
+#define IA32_DEBUGCTLMSR_RTM           (1<<15) /* RTM debugging enable */
 
 #define MSR_IA32_LASTBRANCHFROMIP      0x000001db
 #define MSR_IA32_LASTBRANCHTOIP                0x000001dc
--
generated by git-patchbot for /home/xen/git/xen.git#master

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