diff options
Diffstat (limited to 'arch/x86/xen/enlighten.c')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index b6d61c353fe5..a4d7b647867f 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1414,7 +1414,7 @@ static void __init xen_boot_params_init_edd(void) * is PVH which is not going to use xen_load_gdt_boot or other * __init functions. */ -void __ref xen_setup_gdt(int cpu) +static void __ref xen_setup_gdt(int cpu) { if (xen_feature(XENFEAT_auto_translated_physmap)) { #ifdef CONFIG_X86_64 @@ -1462,13 +1462,40 @@ void __ref xen_setup_gdt(int cpu) pv_cpu_ops.load_gdt = xen_load_gdt; } +/* + * A PV guest starts with default flags that are not set for PVH, set them + * here asap. + */ +static void xen_pvh_set_cr_flags(int cpu) +{ + + /* Some of these are setup in 'secondary_startup_64'. The others: + * X86_CR0_TS, X86_CR0_PE, X86_CR0_ET are set by Xen for HVM guests + * (which PVH shared codepaths), while X86_CR0_PG is for PVH. */ + write_cr0(read_cr0() | X86_CR0_MP | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM); +} + +/* + * Note, that it is ref - because the only caller of this after init + * is PVH which is not going to use xen_load_gdt_boot or other + * __init functions. + */ +void __ref xen_pvh_secondary_vcpu_init(int cpu) +{ + xen_setup_gdt(cpu); + xen_pvh_set_cr_flags(cpu); +} + static void __init xen_pvh_early_guest_init(void) { if (!xen_feature(XENFEAT_auto_translated_physmap)) return; - if (xen_feature(XENFEAT_hvm_callback_vector)) - xen_have_vector_callback = 1; + if (!xen_feature(XENFEAT_hvm_callback_vector)) + return; + + xen_have_vector_callback = 1; + xen_pvh_set_cr_flags(0); #ifdef CONFIG_X86_32 BUG(); /* PVH: Implement proper support. */ |