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KVM: VMX: Execute WBINVD to keep data consistency with assigned devices

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Some guest device driver may leverage the "Non-Snoop" I/O, and explicitly
WBINVD or CLFLUSH to a RAM space. Since migration may occur before WBINVD or
CLFLUSH, we need to maintain data consistency either by:
1: flushing cache (wbinvd) when the guest is scheduled out if there is no
wbinvd exit, or
2: execute wbinvd on all dirty physical CPUs when guest wbinvd exits.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Sheng Yang
2010-06-30 12:25:15 +08:00
committed by Avi Kivity
parent cf3e3d3e19
commit f5f48ee15c
5 changed files with 67 additions and 2 deletions
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10
arch/x86/kvm/vmx.c
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@@ -412,6 +412,12 @@ static inline bool cpu_has_virtual_nmis(void)
return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
}
static inline bool cpu_has_vmx_wbinvd_exit(void)
{
return vmcs_config.cpu_based_2nd_exec_ctrl &
SECONDARY_EXEC_WBINVD_EXITING;
}
static inline bool report_flexpriority(void)
{
return flexpriority_enabled;
@@ -3397,7 +3403,7 @@ static int handle_invlpg(struct kvm_vcpu *vcpu)
static int handle_wbinvd(struct kvm_vcpu *vcpu)
{
skip_emulated_instruction(vcpu);
/* TODO: Add support for VT-d/pass-through device */
kvm_emulate_wbinvd(vcpu);
return 1;
}
@@ -4347,6 +4353,8 @@ static struct kvm_x86_ops vmx_x86_ops = {
.rdtscp_supported = vmx_rdtscp_supported,
.set_supported_cpuid = vmx_set_supported_cpuid,
.has_wbinvd_exit = cpu_has_vmx_wbinvd_exit,
};
static int __init vmx_init(void)