65 lines
2.2 KiB
Diff
65 lines
2.2 KiB
Diff
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diff -Naur --no-dereference a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
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--- a/arch/x86/kvm/vmx/vmx.c 2024-07-01 21:03:34.000000000 +0300
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+++ b/arch/x86/kvm/vmx/vmx.c 2024-07-01 20:24:05.000000000 +0300
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@@ -2714,6 +2714,7 @@
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vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
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vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
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vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
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vmcs_conf->cpu_based_3rd_exec_ctrl = _cpu_based_3rd_exec_control;
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- vmcs_conf->vmexit_ctrl = _vmexit_control;
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+ vmcs_conf->vmexit_ctrl = _vmexit_control | CPU_BASED_RDTSC_EXITING;
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vmcs_conf->vmentry_ctrl = _vmentry_control;
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vmcs_conf->misc = misc_msr;
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diff -Naur --no-dereference a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
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--- a/arch/x86/kvm/vmx/vmx.c 2024-07-01 21:03:34.000000000 +0300
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+++ b/arch/x86/kvm/vmx/vmx.c 2024-07-01 20:24:05.000000000 +0300
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@@ -6128,6 +6128,7 @@
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[EXIT_REASON_ENCLS] = handle_encls,
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[EXIT_REASON_BUS_LOCK] = handle_bus_lock_vmexit,
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[EXIT_REASON_NOTIFY] = handle_notify,
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+ [EXIT_REASON_RDTSC] = handle_rdtsc,
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};
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static const int kvm_vmx_max_exit_handlers =
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diff -Naur --no-dereference a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
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--- a/arch/x86/kvm/vmx/vmx.c 2024-07-01 21:03:34.000000000 +0300
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+++ b/arch/x86/kvm/vmx/vmx.c 2024-07-01 20:24:05.000000000 +0300
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@@ -6070,6 +6070,36 @@
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return 1;
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}
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+static int handle_rdtsc(struct kvm_vcpu *vcpu)
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+{
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+ static u32 _ = 1;
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+ static u64 rdtsc_cur = 0;
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+ static u64 rdtsc_prev = 0;
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+ u64 _rdtsc = rdtsc();
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+
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+ printk_once("[HookEntry] fake rdtsc vmx function is working\n");
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+
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+ if (_)
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+ {
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+ rdtsc_cur = _rdtsc;
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+ _ = 0;
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+ }
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+ if (rdtsc_prev != 0 && _rdtsc > rdtsc_prev)
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+ {
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+ rdtsc_cur += (_rdtsc - rdtsc_prev) / 16;
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+ }
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+
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+ if (rdtsc_cur > _rdtsc)
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+ {
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+ rdtsc_cur = _rdtsc;
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+ }
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+
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+ rdtsc_prev = rdtsc_cur;
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+ vcpu->arch.regs[VCPU_REGS_RAX] = rdtsc_cur & -1u;
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+ vcpu->arch.regs[VCPU_REGS_RDX] = (rdtsc_cur >> 32) & -1u;
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+ return skip_emulated_instruction(vcpu);
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+}
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+
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/*
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* The exit handlers return 1 if the exit was handled fully and guest execution
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* may resume. Otherwise they set the kvm_run parameter to indicate what needs
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