| Message ID | 20210401135451.1004564-9-mlevitsk@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: my debug patch queue | expand |
On Thu, Apr 01, 2021 at 04:54:50PM +0300, Maxim Levitsky wrote: > This parameter will be used by VMX and SVM code to force > interception of a set of exceptions, given by a bitmask > for guest debug and/or kvm debug. > > This option is not intended for production. > > This is based on an idea first shown here: > https://patchwork.kernel.org/project/kvm/patch/20160301192822.GD22677@pd.tnic/ > > CC: Borislav Petkov <bp@suse.de> > Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> > --- > arch/x86/kvm/x86.c | 3 +++ > arch/x86/kvm/x86.h | 2 ++ > 2 files changed, 5 insertions(+) > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 3627ce8fe5bb..1a51031d64d8 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -176,6 +176,9 @@ module_param(force_emulation_prefix, bool, S_IRUGO); > int __read_mostly pi_inject_timer = -1; > module_param(pi_inject_timer, bint, S_IRUGO | S_IWUSR); > > +uint force_intercept_exceptions_mask; > +module_param(force_intercept_exceptions_mask, uint, S_IRUGO | S_IWUSR); > +EXPORT_SYMBOL_GPL(force_intercept_exceptions_mask); That's nice. I could use some text explaning the usage though, i.e. that thing takes a bitfield of exception vectors, so that I don't have to look at the code each time. :-) Thx.
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 3627ce8fe5bb..1a51031d64d8 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -176,6 +176,9 @@ module_param(force_emulation_prefix, bool, S_IRUGO); int __read_mostly pi_inject_timer = -1; module_param(pi_inject_timer, bint, S_IRUGO | S_IWUSR); +uint force_intercept_exceptions_mask; +module_param(force_intercept_exceptions_mask, uint, S_IRUGO | S_IWUSR); +EXPORT_SYMBOL_GPL(force_intercept_exceptions_mask); /* * Restoring the host value for MSRs that are only consumed when running in * usermode, e.g. SYSCALL MSRs and TSC_AUX, can be deferred until the CPU diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index daccf20fbcd5..644480711ff7 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -311,6 +311,8 @@ extern struct static_key kvm_no_apic_vcpu; extern bool report_ignored_msrs; +extern uint force_intercept_exceptions_mask; + static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec) { return pvclock_scale_delta(nsec, vcpu->arch.virtual_tsc_mult,
This parameter will be used by VMX and SVM code to force interception of a set of exceptions, given by a bitmask for guest debug and/or kvm debug. This option is not intended for production. This is based on an idea first shown here: https://patchwork.kernel.org/project/kvm/patch/20160301192822.GD22677@pd.tnic/ CC: Borislav Petkov <bp@suse.de> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> --- arch/x86/kvm/x86.c | 3 +++ arch/x86/kvm/x86.h | 2 ++ 2 files changed, 5 insertions(+)