[Xen-devel] [PATCH v4 05/11] nested vmx: fix handling of RDTSC

[Dongxiao Xu <dongxiao.xu@xxxxxxxxx>]

If L0 is to handle the TSC access, then we need to update guest EIP by
calling update_guest_eip().

Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmx.c        |    2 +-
 xen/arch/x86/hvm/vmx/vvmx.c       |    1 +
 xen/include/asm-x86/hvm/vmx/vmx.h |    2 ++
 3 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 3bb0d99..9fb9562 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -1555,7 +1555,7 @@ static int get_instruction_length(void)
     return len;
 }
 
-static void update_guest_eip(void)
+void update_guest_eip(void)
 {
     struct cpu_user_regs *regs = guest_cpu_user_regs();
     unsigned long x;
diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index d8b7ce5..dab9551 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1614,6 +1614,7 @@ int nvmx_n2_vmexit_handler(struct cpu_user_regs *regs,
             tsc += __get_vvmcs(nvcpu->nv_vvmcx, TSC_OFFSET);
             regs->eax = (uint32_t)tsc;
             regs->edx = (uint32_t)(tsc >> 32);
+            update_guest_eip();
 
             return 1;
         }
diff --git a/xen/include/asm-x86/hvm/vmx/vmx.h 
b/xen/include/asm-x86/hvm/vmx/vmx.h
index c4c2fe8..aa5b080 100644
--- a/xen/include/asm-x86/hvm/vmx/vmx.h
+++ b/xen/include/asm-x86/hvm/vmx/vmx.h
@@ -399,6 +399,8 @@ void ept_p2m_init(struct p2m_domain *p2m);
 void ept_walk_table(struct domain *d, unsigned long gfn);
 void setup_ept_dump(void);
 
+void update_guest_eip(void);
+
 /* EPT violation qualifications definitions */
 #define _EPT_READ_VIOLATION         0
 #define EPT_READ_VIOLATION          (1UL<<_EPT_READ_VIOLATION)
-- 
1.7.1


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