Commit 8c8ae4e8 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'stable/generic' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen

* 'stable/generic' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen: HVM X2APIC support
  apic: Move hypervisor detection of x2apic to hypervisor.h
parents a1e8fad5 d9b8ca84
......@@ -20,6 +20,9 @@
#ifndef _ASM_X86_HYPERVISOR_H
#define _ASM_X86_HYPERVISOR_H
#include <asm/kvm_para.h>
#include <asm/xen/hypervisor.h>
extern void init_hypervisor(struct cpuinfo_x86 *c);
extern void init_hypervisor_platform(void);
......@@ -47,4 +50,13 @@ extern const struct hypervisor_x86 x86_hyper_vmware;
extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
extern const struct hypervisor_x86 x86_hyper_xen_hvm;
static inline bool hypervisor_x2apic_available(void)
{
if (kvm_para_available())
return true;
if (xen_x2apic_para_available())
return true;
return false;
}
#endif
......@@ -37,4 +37,39 @@
extern struct shared_info *HYPERVISOR_shared_info;
extern struct start_info *xen_start_info;
#include <asm/processor.h>
static inline uint32_t xen_cpuid_base(void)
{
uint32_t base, eax, ebx, ecx, edx;
char signature[13];
for (base = 0x40000000; base < 0x40010000; base += 0x100) {
cpuid(base, &eax, &ebx, &ecx, &edx);
*(uint32_t *)(signature + 0) = ebx;
*(uint32_t *)(signature + 4) = ecx;
*(uint32_t *)(signature + 8) = edx;
signature[12] = 0;
if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2))
return base;
}
return 0;
}
#ifdef CONFIG_XEN
extern bool xen_hvm_need_lapic(void);
static inline bool xen_x2apic_para_available(void)
{
return xen_hvm_need_lapic();
}
#else
static inline bool xen_x2apic_para_available(void)
{
return (xen_cpuid_base() != 0);
}
#endif
#endif /* _ASM_X86_XEN_HYPERVISOR_H */
......@@ -49,8 +49,8 @@
#include <asm/mtrr.h>
#include <asm/smp.h>
#include <asm/mce.h>
#include <asm/kvm_para.h>
#include <asm/tsc.h>
#include <asm/hypervisor.h>
unsigned int num_processors;
......@@ -1476,7 +1476,8 @@ void __init enable_IR_x2apic(void)
/* IR is required if there is APIC ID > 255 even when running
* under KVM
*/
if (max_physical_apicid > 255 || !kvm_para_available())
if (max_physical_apicid > 255 ||
!hypervisor_x2apic_available())
goto nox2apic;
/*
* without IR all CPUs can be addressed by IOAPIC/MSI
......
......@@ -1256,25 +1256,6 @@ asmlinkage void __init xen_start_kernel(void)
#endif
}
static uint32_t xen_cpuid_base(void)
{
uint32_t base, eax, ebx, ecx, edx;
char signature[13];
for (base = 0x40000000; base < 0x40010000; base += 0x100) {
cpuid(base, &eax, &ebx, &ecx, &edx);
*(uint32_t *)(signature + 0) = ebx;
*(uint32_t *)(signature + 4) = ecx;
*(uint32_t *)(signature + 8) = edx;
signature[12] = 0;
if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2))
return base;
}
return 0;
}
static int init_hvm_pv_info(int *major, int *minor)
{
uint32_t eax, ebx, ecx, edx, pages, msr, base;
......@@ -1384,6 +1365,18 @@ static bool __init xen_hvm_platform(void)
return true;
}
bool xen_hvm_need_lapic(void)
{
if (xen_pv_domain())
return false;
if (!xen_hvm_domain())
return false;
if (xen_feature(XENFEAT_hvm_pirqs) && xen_have_vector_callback)
return false;
return true;
}
EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);
const __refconst struct hypervisor_x86 x86_hyper_xen_hvm = {
.name = "Xen HVM",
.detect = xen_hvm_platform,
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment