Re: [PATCH v3 07/27] KVM: VMX: Initialize VMCS FRED fields

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 10/22/2024 2:06 AM, Chao Gao wrote:
@@ -1503,6 +1503,18 @@ void vmx_vcpu_load_vmcs(struct kvm_vcpu *vcpu, int cpu,
				    (unsigned long)(cpu_entry_stack(cpu) + 1));
		}

+		/* Per-CPU FRED MSRs */
+		if (kvm_cpu_cap_has(X86_FEATURE_FRED)) {
+#ifdef CONFIG_X86_64
+			vmcs_write64(HOST_IA32_FRED_RSP1, __this_cpu_ist_top_va(DB));
+			vmcs_write64(HOST_IA32_FRED_RSP2, __this_cpu_ist_top_va(NMI));
+			vmcs_write64(HOST_IA32_FRED_RSP3, __this_cpu_ist_top_va(DF));
+#endif
+			vmcs_write64(HOST_IA32_FRED_SSP1, 0);
+			vmcs_write64(HOST_IA32_FRED_SSP2, 0);
+			vmcs_write64(HOST_IA32_FRED_SSP3, 0);

Given SSP[1-3] are constant for now, how about asserting that host SSP[1-3] are
all zeros when KVM is loaded and moving their writes to vmx_set_constant_host_state()?

I like the idea :)




[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux