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refine external interrupt VM exit handler

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- According to Intel SDM 24.9.2,Vol3, should check the
  validity of "VM-exit interruption information" before
  extracting the vector of interrupt.

Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
This commit is contained in:
Yonghua Huang 2018-05-07 18:43:42 +08:00 committed by lijinxia
parent e12210a014
commit a1e324cbfd
1 changed files with 12 additions and 3 deletions
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15
arch/x86/interrupt.c
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@ -266,16 +266,25 @@ int interrupt_window_vmexit_handler(struct vcpu *vcpu)
int external_interrupt_vmexit_handler(struct vcpu *vcpu)
{
int vector = exec_vmread(VMX_EXIT_INT_INFO) & 0xFF;
uint32_t intr_info;
struct intr_ctx ctx;
ctx.vector = vector;
intr_info = exec_vmread(VMX_EXIT_INT_INFO);
if ((!(intr_info & VMX_INT_INFO_VALID)) ||
(((intr_info & VMX_INT_TYPE_MASK) >> 8)
!= VMX_INT_TYPE_EXT_INT)) {
pr_err("Invalid VM exit interrupt info:%x", intr_info);
VCPU_RETAIN_RIP(vcpu);
return -EINVAL;
}
ctx.vector = intr_info & 0xFF;
dispatch_interrupt(&ctx);
VCPU_RETAIN_RIP(vcpu);
TRACE_2L(TRC_VMEXIT_EXTERNAL_INTERRUPT, vector, 0);
TRACE_2L(TRC_VMEXIT_EXTERNAL_INTERRUPT, ctx.vector, 0);
return 0;
}