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| author | Sheng Yang | 2010-06-30 06:25:15 +0200 |
|---|---|---|
| committer | Avi Kivity | 2010-08-01 09:47:21 +0200 |
| commit | f5f48ee15c2ee3e44cf429e34b16c6fa9b900246 (patch) | |
| tree | 75496197219d9aeedd3317fa007cc3b2e414c5da /arch/x86/kvm/vmx.c | |
| parent | KVM: Document KVM specific review items (diff) | |
| download | kernel-qcow2-linux-f5f48ee15c2ee3e44cf429e34b16c6fa9b900246.tar.gz kernel-qcow2-linux-f5f48ee15c2ee3e44cf429e34b16c6fa9b900246.tar.xz kernel-qcow2-linux-f5f48ee15c2ee3e44cf429e34b16c6fa9b900246.zip | |
KVM: VMX: Execute WBINVD to keep data consistency with assigned devices
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>
Diffstat (limited to 'arch/x86/kvm/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 661c6e199b4a..4dfb1dc09c88 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -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) |