search for: 35e02a7

...st, and auto switch the stack MSRs upon VMEntry and VMExit. Signed-off-by: Wei Wang <wei.w.wang at intel.com> --- arch/x86/kvm/vmx.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 5f5c2f1..35e02a7 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -107,6 +107,9 @@ static u64 __read_mostly host_xss; static bool __read_mostly enable_pml = 1; module_param_named(pml, enable_pml, bool, S_IRUGO); +static bool __read_mostly enable_lbrv = 1; +module_param_named(lbrv, enable_lbrv, bool,...

...because it may prevent live migration to hosts with a different family/model. Paolo > --- > arch/x86/kvm/vmx.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 50 insertions(+) > > diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c > index 5f5c2f1..35e02a7 100644 > --- a/arch/x86/kvm/vmx.c > +++ b/arch/x86/kvm/vmx.c > @@ -107,6 +107,9 @@ static u64 __read_mostly host_xss; > static bool __read_mostly enable_pml = 1; > module_param_named(pml, enable_pml, bool, S_IRUGO); > > +static bool __read_mostly enable_lbrv = 1; > +modu...

...because it may prevent live migration to hosts with a different family/model. Paolo > --- > arch/x86/kvm/vmx.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 50 insertions(+) > > diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c > index 5f5c2f1..35e02a7 100644 > --- a/arch/x86/kvm/vmx.c > +++ b/arch/x86/kvm/vmx.c > @@ -107,6 +107,9 @@ static u64 __read_mostly host_xss; > static bool __read_mostly enable_pml = 1; > module_param_named(pml, enable_pml, bool, S_IRUGO); > > +static bool __read_mostly enable_lbrv = 1; > +modu...

This patch series enables the Last Branch Recording feature for the guest. Instead of trapping each LBR stack MSR access, the MSRs are passthroughed to the guest. Those MSRs are switched (i.e. load and saved) on VMExit and VMEntry. Test: Try "perf record -b ./test_program" on guest. Wei Wang (4): KVM/vmx: re-write the msr auto switch feature KVM/vmx: auto switch

This patch series enables the Last Branch Recording feature for the guest. Instead of trapping each LBR stack MSR access, the MSRs are passthroughed to the guest. Those MSRs are switched (i.e. load and saved) on VMExit and VMEntry. Test: Try "perf record -b ./test_program" on guest. Wei Wang (4): KVM/vmx: re-write the msr auto switch feature KVM/vmx: auto switch