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SUSE:SLE-12-SP1:GA
xen.8005
5aaa5c98-x86-ignore-guest-microcode-loads.patch
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File 5aaa5c98-x86-ignore-guest-microcode-loads.patch of Package xen.8005
# Commit 59c0983e10d70ea2368085271b75fb007811fe52 # Date 2018-03-15 12:44:24 +0100 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> x86: ignore guest microcode loading attempts The respective MSRs are write-only, and hence attempts by guests to write to these are - as of 1f1d183d49 ("x86/HVM: don't give the wrong impression of WRMSR succeeding") no longer ignored. Restore original behavior for the two affected MSRs. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> --- a/xen/arch/x86/hvm/hvm.c +++ b/xen/arch/x86/hvm/hvm.c @@ -3353,6 +3353,8 @@ int hvm_msr_read_intercept(unsigned int *msr_content = var_range_base[index]; break; + case MSR_AMD_PATCHLOADER: + case MSR_IA32_UCODE_WRITE: case MSR_PRED_CMD: /* Write-only */ goto gp_fault; @@ -3422,6 +3424,26 @@ int hvm_msr_write_intercept(unsigned int return X86EMUL_EXCEPTION; break; + case MSR_AMD_PATCHLOADER: + /* + * See note on MSR_IA32_UCODE_WRITE below, which may or may not apply + * to AMD CPUs as well (at least the architectural/CPUID part does). + */ + if ( boot_cpu_data.x86_vendor != X86_VENDOR_AMD ) + goto gp_fault; + break; + + case MSR_IA32_UCODE_WRITE: + /* + * Some versions of Windows at least on certain hardware try to load + * microcode before setting up an IDT. Therefore we must not inject #GP + * for such attempts. Also the MSR is architectural and not qualified + * by any CPUID bit. + */ + if ( boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ) + goto gp_fault; + break; + case MSR_IA32_TSC: hvm_set_guest_tsc_msr(v, msr_content); break;
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