hw/i386/vmport: Allow x2apic without IR
Signal to guest that hypervisor supports x2apic without VT-d/IOMMU Interrupt-Remapping support. This allows guest to use x2apic in case all APIC IDs fits in 8-bit (i.e. Max APIC ID < 255). See Linux kernel commit 4cca6ea04d31 ("x86/apic: Allow x2apic without IR on VMware platform") and Linux try_to_enable_x2apic() function. Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com> Signed-off-by: Liran Alon <liran.alon@oracle.com> Message-Id: <20200312165431.82118-14-liran.alon@oracle.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -176,7 +176,14 @@ static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
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static uint32_t vmport_cmd_get_vcpu_info(void *opaque, uint32_t addr)
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{
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return 1 << VCPU_INFO_RESERVED_BIT;
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X86CPU *cpu = X86_CPU(current_cpu);
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uint32_t ret = 0;
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if (cpu->env.features[FEAT_1_ECX] & CPUID_EXT_X2APIC) {
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ret |= 1 << VCPU_INFO_LEGACY_X2APIC_BIT;
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}
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return ret;
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}
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static const MemoryRegionOps vmport_ops = {
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