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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 10/17] vmx: nest: VMExit handler in L2
Handles VMExits happened in L2
Signed-off-by: Qing He <qing.he@xxxxxxxxx>
---
arch/x86/hvm/vmx/nest.c | 182 +++++++++++++++++++++++++++++++++++++++++
arch/x86/hvm/vmx/vmx.c | 6 +
include/asm-x86/hvm/vmx/nest.h | 3
include/asm-x86/hvm/vmx/vmx.h | 1
4 files changed, 192 insertions(+)
diff -r a7de30ed250d -r 2f9ba6dbbe62 xen/arch/x86/hvm/vmx/nest.c
--- a/xen/arch/x86/hvm/vmx/nest.c Thu Apr 22 22:30:09 2010 +0800
+++ b/xen/arch/x86/hvm/vmx/nest.c Thu Apr 22 22:30:09 2010 +0800
@@ -976,3 +976,185 @@
/* TODO: NMI */
}
+
+/*
+ * L2 VMExit handling
+ */
+
+static struct control_bit_for_reason {
+ int reason;
+ unsigned long bit;
+} control_bit_for_reason [] = {
+ {EXIT_REASON_PENDING_VIRT_INTR, CPU_BASED_VIRTUAL_INTR_PENDING},
+ {EXIT_REASON_HLT, CPU_BASED_HLT_EXITING},
+ {EXIT_REASON_INVLPG, CPU_BASED_INVLPG_EXITING},
+ {EXIT_REASON_MWAIT_INSTRUCTION, CPU_BASED_MWAIT_EXITING},
+ {EXIT_REASON_RDPMC, CPU_BASED_RDPMC_EXITING},
+ {EXIT_REASON_RDTSC, CPU_BASED_RDTSC_EXITING},
+ {EXIT_REASON_PENDING_VIRT_NMI, CPU_BASED_VIRTUAL_NMI_PENDING},
+ {EXIT_REASON_DR_ACCESS, CPU_BASED_MOV_DR_EXITING},
+ {EXIT_REASON_MONITOR_INSTRUCTION, CPU_BASED_MONITOR_EXITING},
+ {EXIT_REASON_PAUSE_INSTRUCTION, CPU_BASED_PAUSE_EXITING},
+};
+
+int vmx_nest_l2_vmexit_handler(struct cpu_user_regs *regs,
+ unsigned int exit_reason)
+{
+ struct vcpu *v = current;
+ struct vmx_nest_struct *nest = &v->arch.hvm_vmx.nest;
+ u32 ctrl;
+ int bypass_l0 = 0;
+
+ nest->vmexit_pending = 0;
+ nest->intr_info = 0;
+ nest->error_code = 0;
+
+ switch (exit_reason) {
+ case EXIT_REASON_EXCEPTION_NMI:
+ {
+ u32 intr_info = __vmread(VM_EXIT_INTR_INFO);
+ u32 valid_mask = (X86_EVENTTYPE_HW_EXCEPTION << 8) |
+ INTR_INFO_VALID_MASK;
+ u64 exec_bitmap;
+ int vector = intr_info & INTR_INFO_VECTOR_MASK;
+
+ /*
+ * decided by L0 and L1 exception bitmap, if the vetor is set by
+ * both, L0 has priority on #PF, L1 has priority on others
+ */
+ if ( vector == TRAP_page_fault )
+ {
+ if ( paging_mode_hap(v->domain) )
+ nest->vmexit_pending = 1;
+ }
+ else if ( (intr_info & valid_mask) == valid_mask )
+ {
+ exec_bitmap =__get_vvmcs(nest->vvmcs, EXCEPTION_BITMAP);
+
+ if ( exec_bitmap & (1 << vector) )
+ nest->vmexit_pending = 1;
+ }
+ break;
+ }
+
+ case EXIT_REASON_WBINVD:
+ case EXIT_REASON_EPT_VIOLATION:
+ case EXIT_REASON_EPT_MISCONFIG:
+ case EXIT_REASON_EXTERNAL_INTERRUPT:
+ /* pass to L0 handler */
+ break;
+
+ case VMX_EXIT_REASONS_FAILED_VMENTRY:
+ case EXIT_REASON_TRIPLE_FAULT:
+ case EXIT_REASON_TASK_SWITCH:
+ case EXIT_REASON_IO_INSTRUCTION:
+ case EXIT_REASON_CPUID:
+ case EXIT_REASON_MSR_READ:
+ case EXIT_REASON_MSR_WRITE:
+ case EXIT_REASON_VMCALL:
+ case EXIT_REASON_VMCLEAR:
+ case EXIT_REASON_VMLAUNCH:
+ case EXIT_REASON_VMPTRLD:
+ case EXIT_REASON_VMPTRST:
+ case EXIT_REASON_VMREAD:
+ case EXIT_REASON_VMRESUME:
+ case EXIT_REASON_VMWRITE:
+ case EXIT_REASON_VMXOFF:
+ case EXIT_REASON_VMXON:
+ case EXIT_REASON_INVEPT:
+ /* inject to L1 */
+ nest->vmexit_pending = 1;
+ break;
+
+ case EXIT_REASON_PENDING_VIRT_INTR:
+ {
+ ctrl = v->arch.hvm_vmx.exec_control;
+
+ /*
+ * if both open intr/nmi window, L0 has priority.
+ *
+ * Note that this is not strictly correct, in L2 context,
+ * L0's intr/nmi window flag should be replaced to MTF,
+ * causing an imediate VMExit, but MTF may not be available
+ * on all hardware.
+ */
+ if ( !(ctrl & CPU_BASED_VIRTUAL_INTR_PENDING) )
+ nest->vmexit_pending = 1;
+
+ break;
+ }
+ case EXIT_REASON_PENDING_VIRT_NMI:
+ {
+ ctrl = v->arch.hvm_vmx.exec_control;
+
+ if ( !(ctrl & CPU_BASED_VIRTUAL_NMI_PENDING) )
+ nest->vmexit_pending = 1;
+
+ break;
+ }
+
+ case EXIT_REASON_HLT:
+ case EXIT_REASON_RDTSC:
+ case EXIT_REASON_RDPMC:
+ case EXIT_REASON_MWAIT_INSTRUCTION:
+ case EXIT_REASON_PAUSE_INSTRUCTION:
+ case EXIT_REASON_MONITOR_INSTRUCTION:
+ case EXIT_REASON_DR_ACCESS:
+ case EXIT_REASON_INVLPG:
+ {
+ int i;
+
+ /* exit according to guest exec_control */
+ ctrl = __get_vvmcs(nest->vvmcs, CPU_BASED_VM_EXEC_CONTROL);
+
+ for ( i = 0; i < ARRAY_SIZE(control_bit_for_reason); i++ )
+ if ( control_bit_for_reason[i].reason == exit_reason )
+ break;
+
+ if ( i == ARRAY_SIZE(control_bit_for_reason) )
+ break;
+
+ if ( control_bit_for_reason[i].bit & ctrl )
+ nest->vmexit_pending = 1;
+
+ break;
+ }
+ case EXIT_REASON_CR_ACCESS:
+ {
+ u64 exit_qualification = __vmread(EXIT_QUALIFICATION);
+ int cr = exit_qualification & 15;
+ int write = (exit_qualification >> 4) & 3;
+ u32 mask = 0;
+
+ /* also according to guest exec_control */
+ ctrl = __get_vvmcs(nest->vvmcs, CPU_BASED_VM_EXEC_CONTROL);
+
+ if ( cr == 3 )
+ {
+ mask = write? CPU_BASED_CR3_STORE_EXITING:
+ CPU_BASED_CR3_LOAD_EXITING;
+ if ( ctrl & mask )
+ nest->vmexit_pending = 1;
+ }
+ else if ( cr == 8 )
+ {
+ mask = write? CPU_BASED_CR8_STORE_EXITING:
+ CPU_BASED_CR8_LOAD_EXITING;
+ if ( ctrl & mask )
+ nest->vmexit_pending = 1;
+ }
+ else /* CR0, CR4, CLTS, LMSW */
+ nest->vmexit_pending = 1;
+
+ break;
+ }
+ default:
+ gdprintk(XENLOG_WARNING, "Unknown nested vmexit reason %x.\n",
+ exit_reason);
+ }
+
+ if ( nest->vmexit_pending )
+ bypass_l0 = 1;
+
+ return bypass_l0;
+}
diff -r a7de30ed250d -r 2f9ba6dbbe62 xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c Thu Apr 22 22:30:09 2010 +0800
+++ b/xen/arch/x86/hvm/vmx/vmx.c Thu Apr 22 22:30:09 2010 +0800
@@ -2397,6 +2397,11 @@
local_irq_enable();
v->arch.hvm_vmx.nest.vmresume_in_progress = 0;
+ if ( v->arch.hvm_vcpu.in_nesting )
+ {
+ if ( vmx_nest_l2_vmexit_handler(regs, exit_reason) )
+ goto out;
+ }
if ( unlikely(exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) )
return vmx_failed_vmentry(exit_reason, regs);
@@ -2760,6 +2765,7 @@
break;
}
+out:
if ( v->arch.hvm_vcpu.in_nesting )
vmx_nest_idtv_handling();
}
diff -r a7de30ed250d -r 2f9ba6dbbe62 xen/include/asm-x86/hvm/vmx/nest.h
--- a/xen/include/asm-x86/hvm/vmx/nest.h Thu Apr 22 22:30:09 2010 +0800
+++ b/xen/include/asm-x86/hvm/vmx/nest.h Thu Apr 22 22:30:09 2010 +0800
@@ -71,4 +71,7 @@
void vmx_nest_idtv_handling(void);
+int vmx_nest_l2_vmexit_handler(struct cpu_user_regs *regs,
+ unsigned int exit_reason);
+
#endif /* __ASM_X86_HVM_NEST_H__ */
diff -r a7de30ed250d -r 2f9ba6dbbe62 xen/include/asm-x86/hvm/vmx/vmx.h
--- a/xen/include/asm-x86/hvm/vmx/vmx.h Thu Apr 22 22:30:09 2010 +0800
+++ b/xen/include/asm-x86/hvm/vmx/vmx.h Thu Apr 22 22:30:09 2010 +0800
@@ -112,6 +112,7 @@
#define EXIT_REASON_APIC_ACCESS 44
#define EXIT_REASON_EPT_VIOLATION 48
#define EXIT_REASON_EPT_MISCONFIG 49
+#define EXIT_REASON_INVEPT 50
#define EXIT_REASON_RDTSCP 51
#define EXIT_REASON_WBINVD 54
#define EXIT_REASON_XSETBV 55
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