[Xen-devel] [Patch RFC 07/13] vt-d: If the qi_flag is Set, the domain's vCPUs are not allowed to

[Quan Xu <quan.xu@xxxxxxxxx>]

entry guest mode and put into the SCHEDOP_yield list.

Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/entry.S      | 10 ++++++++++
 xen/arch/x86/x86_64/asm-offsets.c |  1 +
 xen/common/domain.c               |  5 +++++
 xen/include/xen/hvm/iommu.h       |  2 ++
 4 files changed, 18 insertions(+)

diff --git a/xen/arch/x86/hvm/vmx/entry.S b/xen/arch/x86/hvm/vmx/entry.S
index 2a4ed57..53a4c58 100644
--- a/xen/arch/x86/hvm/vmx/entry.S
+++ b/xen/arch/x86/hvm/vmx/entry.S
@@ -66,6 +66,10 @@ ENTRY(vmx_asm_vmexit_handler)
         cmp  %ecx,(%rdx,%rax,1)
         jnz  .Lvmx_process_softirqs
 
+        mov  VCPU_domain(%rbx),%rax
+        cmp  $0,QI_flag(%rax)
+        jne  .Lqi_flushing
+
         cmp  %cl,VCPU_vmx_emulate(%rbx)
         jne .Lvmx_goto_emulator
         cmp  %cl,VCPU_vmx_realmode(%rbx)
@@ -125,3 +129,9 @@ ENTRY(vmx_asm_do_vmentry)
         sti
         call do_softirq
         jmp  .Lvmx_do_vmentry
+
+.Lqi_flushing:
+        sti
+        mov %rax,%rdi
+        call do_qi_flushing
+        jmp  .Lvmx_do_vmentry
diff --git a/xen/arch/x86/x86_64/asm-offsets.c 
b/xen/arch/x86/x86_64/asm-offsets.c
index 447c650..d26b026 100644
--- a/xen/arch/x86/x86_64/asm-offsets.c
+++ b/xen/arch/x86/x86_64/asm-offsets.c
@@ -116,6 +116,7 @@ void __dummy__(void)
     BLANK();
 
     OFFSET(DOMAIN_is_32bit_pv, struct domain, arch.is_32bit_pv);
+    OFFSET(QI_flag, struct domain, arch.hvm_domain.hvm_iommu.qi_flag);
     BLANK();
 
     OFFSET(VMCB_rax, struct vmcb_struct, rax);
diff --git a/xen/common/domain.c b/xen/common/domain.c
index 1b9fcfc..1f62e3b 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -1479,6 +1479,11 @@ int continue_hypercall_on_cpu(
     return 0;
 }
 
+void do_qi_flushing(struct domain *d)
+{
+    do_sched_op(SCHEDOP_yield, guest_handle_from_ptr(NULL, void));
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/xen/hvm/iommu.h b/xen/include/xen/hvm/iommu.h
index e838905..e40fc7b 100644
--- a/xen/include/xen/hvm/iommu.h
+++ b/xen/include/xen/hvm/iommu.h
@@ -57,6 +57,8 @@ struct hvm_iommu {
     DECLARE_BITMAP(features, IOMMU_FEAT_count);
 };
 
+void do_qi_flushing(struct domain *d);
+
 #define iommu_set_feature(d, f)   set_bit((f), domain_hvm_iommu(d)->features)
 #define iommu_clear_feature(d, f) clear_bit((f), domain_hvm_iommu(d)->features)
 
-- 
1.8.3.2


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