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xen: HVM X2APIC support

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This patch is similiar to Gleb Natapov's patch for KVM, which enable the
hypervisor to emulate x2apic feature for the guest. By this way, the emulation
of lapic would be simpler with x2apic interface(MSR), and faster.

[v2: Re-organized 'xen_hvm_need_lapic' per Ian Campbell suggestion]

Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Sheng Yang 2010-12-21 14:18:49 +08:00 committed by Konrad Rzeszutek Wilk
parent 2904ed8dd5
commit d9b8ca8474
3 changed files with 50 additions and 19 deletions
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3
arch/x86/include/asm/hypervisor.h
View File

@ -21,6 +21,7 @@
#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);
@ -53,6 +54,8 @@ static inline bool hypervisor_x2apic_available(void)
{
if (kvm_para_available())
return true;
if (xen_x2apic_para_available())
return true;
return false;
}

35
arch/x86/include/asm/xen/hypervisor.h
View File

@ -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 */

31
arch/x86/xen/enlighten.c
View File

@ -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,