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i386/hvf: Integrates x2APIC support with hvf accel

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Support for x2APIC mode was recently introduced in the software emulated
APIC implementation for TCG. Enabling it when using macOS’s hvf
accelerator is useful and significantly helps performance, as Qemu
currently uses the emulated APIC when running on hvf as well.

This change wires up the read & write operations for the MSR VM exits
and allow-lists the CPUID flag in the x86 hvf runtime.

Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
Link: https://lore.kernel.org/r/20241105155800.5461-2-phil@philjordan.eu
Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Phil Dennis-Jordan 2024-11-05 16:57:56 +01:00 committed by Paolo Bonzini
parent b7e55bd9d0
commit 0e27f3a5d0
2 changed files with 32 additions and 1 deletions
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2
target/i386/hvf/x86_cpuid.c
View File

@ -77,7 +77,7 @@ uint32_t hvf_get_supported_cpuid(uint32_t func, uint32_t idx,
ecx &= CPUID_EXT_SSE3 | CPUID_EXT_PCLMULQDQ | CPUID_EXT_SSSE3 |
CPUID_EXT_FMA | CPUID_EXT_CX16 | CPUID_EXT_PCID |
CPUID_EXT_SSE41 | CPUID_EXT_SSE42 | CPUID_EXT_MOVBE |
CPUID_EXT_POPCNT | CPUID_EXT_AES |
CPUID_EXT_POPCNT | CPUID_EXT_AES | CPUID_EXT_X2APIC |
(supported_xcr0 ? CPUID_EXT_XSAVE : 0) |
CPUID_EXT_AVX | CPUID_EXT_F16C | CPUID_EXT_RDRAND;
ecx |= CPUID_EXT_HYPERVISOR;

31
target/i386/hvf/x86_emu.c
View File

@ -663,6 +663,15 @@ static void exec_lods(CPUX86State *env, struct x86_decode *decode)
env->eip += decode->len;
}
static void raise_exception(CPUX86State *env, int exception_index,
int error_code)
{
env->exception_nr = exception_index;
env->error_code = error_code;
env->has_error_code = true;
env->exception_injected = 1;
}
void simulate_rdmsr(CPUX86State *env)
{
X86CPU *cpu = env_archcpu(env);
@ -677,6 +686,17 @@ void simulate_rdmsr(CPUX86State *env)
case MSR_IA32_APICBASE:
val = cpu_get_apic_base(cpu->apic_state);
break;
case MSR_APIC_START ... MSR_APIC_END: {
int ret;
int index = (uint32_t)env->regs[R_ECX] - MSR_APIC_START;
ret = apic_msr_read(index, &val);
if (ret < 0) {
raise_exception(env, EXCP0D_GPF, 0);
}
break;
}
case MSR_IA32_UCODE_REV:
val = cpu->ucode_rev;
break;
@ -777,6 +797,17 @@ void simulate_wrmsr(CPUX86State *env)
case MSR_IA32_APICBASE:
cpu_set_apic_base(cpu->apic_state, data);
break;
case MSR_APIC_START ... MSR_APIC_END: {
int ret;
int index = (uint32_t)env->regs[R_ECX] - MSR_APIC_START;
ret = apic_msr_write(index, data);
if (ret < 0) {
raise_exception(env, EXCP0D_GPF, 0);
}
break;
}
case MSR_FSBASE:
wvmcs(cs->accel->fd, VMCS_GUEST_FS_BASE, data);
break;