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target/i386: suppress CPUID leaves not defined by the CPU vendor

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Currently all built-in CPUs report cache information via CPUID leaves 2
and 4, but these have never been defined for AMD. In the case of
SEV-SNP this can cause issues with CPUID enforcement. Address this by
allowing CPU types to suppress these via a new "x-vendor-cpuid-only"
CPU property, which is true by default, but switched off for older
machine types to maintain compatibility.

Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: zhenwei pi <pizhenwei@bytedance.com>
Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Message-Id: <20210708003623.18665-1-michael.roth@amd.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Michael Roth 2021-07-07 19:36:23 -05:00 • committed by Eduardo Habkost
parent cce087f628
commit a7a0da844d
3 changed files with 10 additions and 0 deletions
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hw/i386/pc.c
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@ -98,6 +98,7 @@ GlobalProperty pc_compat_6_0[] = {
{ "qemu64" "-" TYPE_X86_CPU, "family", "6" },
{ "qemu64" "-" TYPE_X86_CPU, "model", "6" },
{ "qemu64" "-" TYPE_X86_CPU, "stepping", "3" },
{ TYPE_X86_CPU, "x-vendor-cpuid-only", "off" },
};
const size_t pc_compat_6_0_len = G_N_ELEMENTS(pc_compat_6_0);