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x86: Implement MSR_CORE_THREAD_COUNT MSR

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Intel CPUs starting with Haswell-E implement a new MSR called
MSR_CORE_THREAD_COUNT which exposes the number of threads and cores
inside of a package.

This MSR is used by XNU to populate internal data structures and not
implementing it prevents virtual machines with more than 1 vCPU from
booting if the emulated CPU generation is at least Haswell-E.

This patch propagates the existing hvf logic from patch 027ac0cb51
("target/i386/hvf: add rdmsr 35H MSR_CORE_THREAD_COUNT") to TCG.

Signed-off-by: Alexander Graf <agraf@csgraf.de>
Message-Id: <20221004225643.65036-2-agraf@csgraf.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alexander Graf 2022-10-05 00:56:41 +02:00 committed by Paolo Bonzini
parent e3a79e0e87
commit 62a44fddb2
1 changed files with 5 additions and 0 deletions
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5
target/i386/tcg/sysemu/misc_helper.c
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@ -450,6 +450,11 @@ void helper_rdmsr(CPUX86State *env)
case MSR_IA32_UCODE_REV:
val = x86_cpu->ucode_rev;
break;
case MSR_CORE_THREAD_COUNT: {
CPUState *cs = CPU(x86_cpu);
val = (cs->nr_threads * cs->nr_cores) | (cs->nr_cores << 16);
break;
}
default:
if ((uint32_t)env->regs[R_ECX] >= MSR_MC0_CTL
&& (uint32_t)env->regs[R_ECX] < MSR_MC0_CTL +