Commit bf56c410 authored by Juergen Gross's avatar Juergen Gross
Browse files

x86/xen: mark boot CPU of PV guest in MSR_IA32_APICBASE 



Recent topology checks of the x86 boot code uncovered the need for
PV guests to have the boot cpu marked in the APICBASE MSR.

Fixes: 9d22c963 ("x86/topology: Handle bogus ACPI tables correctly")
Reported-by: default avatarNiels Dettenbach <nd@syndicat.com>
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
parent 9af48210

arch/x86/xen/enlighten_pv.c

+4 −0
Original line number Diff line number Diff line
@@ -1032,6 +1032,10 @@ static u64 xen_do_read_msr(unsigned int msr, int *err) 
	switch (msr) {

	case MSR_IA32_APICBASE:

		val &= ~X2APIC_ENABLE;

		if (smp_processor_id() == 0)

			val |= MSR_IA32_APICBASE_BSP;

		else

			val &= ~MSR_IA32_APICBASE_BSP;

		break;

	}

	return val;