Commit f98bbd83 authored by Babu Moger's avatar Babu Moger Committed by Eduardo Habkost
Browse files

i386: Allow TOPOEXT to be enabled on older kernels 



Enabling TOPOEXT feature might cause compatibility issues if
older kernels does not set this feature. Lets set this feature
unconditionally.

Signed-off-by: default avatarBabu Moger <babu.moger@amd.com>
Message-Id: <1528939107-17193-2-git-send-email-babu.moger@amd.com>
[ehabkost: rewrite comment and commit message]
Signed-off-by: default avatarEduardo Habkost <ehabkost@redhat.com>
parent 254790a9

target/i386/kvm.c

+7 −0
Original line number Diff line number Diff line
@@ -372,6 +372,13 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s, uint32_t function, 
        if (host_tsx_blacklisted()) {

            ret &= ~(CPUID_7_0_EBX_RTM | CPUID_7_0_EBX_HLE);

        }

    } else if (function == 0x80000001 && reg == R_ECX) {

        /*

         * It's safe to enable TOPOEXT even if it's not returned by

         * GET_SUPPORTED_CPUID.  Unconditionally enabling TOPOEXT here allows

         * us to keep CPU models including TOPOEXT runnable on older kernels.

         */

        ret |= CPUID_EXT3_TOPOEXT;

    } else if (function == 0x80000001 && reg == R_EDX) {

        /* On Intel, kvm returns cpuid according to the Intel spec,

         * so add missing bits according to the AMD spec: