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>
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 = {