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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>
This commit is contained in:
Liran Alon 2020-03-12 18:54:28 +02:00 committed by Paolo Bonzini
parent acacd3550b
commit 7f9114b77c
1 changed files with 8 additions and 1 deletions
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9
hw/i386/vmport.c
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@ -176,7 +176,14 @@ static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
static uint32_t vmport_cmd_get_vcpu_info(void *opaque, uint32_t addr)
{
return 1 << VCPU_INFO_RESERVED_BIT;
X86CPU *cpu = X86_CPU(current_cpu);
uint32_t ret = 0;
if (cpu->env.features[FEAT_1_ECX] & CPUID_EXT_X2APIC) {
ret |= 1 << VCPU_INFO_LEGACY_X2APIC_BIT;
}
return ret;
}
static const MemoryRegionOps vmport_ops = {