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svm: Do not intercept RDTSC(P) when TSC scaling is supported by hardware
When running in TSC_MODE_ALWAYS_EMULATE mode on processors that support TSC scaling we don't need to intercept RDTSC/RDTSCP instructions. Signed-off-by: Boris Ostrovsky <boris.ostrovsky@amd.com> Acked-by: Wei Huang <wei.huang2@amd.com> Tested-by: Wei Huang <wei.huang2@amd.com> Committed-by: Keir Fraser <keir@xen.org>
This commit is contained in:
Boris Ostrovsky committed
1 parent
6e1a7d28c9
commit
4aab59a3c5
1 file changed
+8
-1
@@ -724,12 +724,19 @@ static void svm_set_rdtsc_exiting(struct vcpu *v, bool_t enable)
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{
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struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
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u32 general1_intercepts = vmcb_get_general1_intercepts(vmcb);
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u32 general2_intercepts = vmcb_get_general2_intercepts(vmcb);
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general1_intercepts &= ~GENERAL1_INTERCEPT_RDTSC;
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if ( enable )
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general2_intercepts &= ~GENERAL2_INTERCEPT_RDTSCP;
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if ( enable && !cpu_has_tsc_ratio )
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{
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general1_intercepts |= GENERAL1_INTERCEPT_RDTSC;
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general2_intercepts |= GENERAL2_INTERCEPT_RDTSCP;
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}
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vmcb_set_general1_intercepts(vmcb, general1_intercepts);
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vmcb_set_general2_intercepts(vmcb, general2_intercepts);
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}
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static unsigned int svm_get_insn_bytes(struct vcpu *v, uint8_t *buf)
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