Messages in this thread Patch in this message | | | From | Maxim Levitsky <> | Subject | [PATCH v2 8/9] KVM: x86: add force_intercept_exceptions_mask | Date | Thu, 1 Apr 2021 16:54:50 +0300 |
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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); /* * 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, -- 2.26.2
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