On Wednesday 08 December 2010 14:04:00 Sheng Yang wrote:
> 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.
>
> Signed-off-by: Sheng Yang <sheng@xxxxxxxxxxxxxxx>
Jeremy, any comments?
Keir has already checked the hypervisor part in.
--
regards
Yang, Sheng
> ---
> arch/x86/include/asm/hypervisor.h | 3 ++
> arch/x86/include/asm/xen/hypervisor.h | 35
> +++++++++++++++++++++++++++++++++ arch/x86/xen/enlighten.c |
> 30 ++++++++++----------------- 3 files changed, 49 insertions(+), 19
> deletions(-)
>
> diff --git a/arch/x86/include/asm/hypervisor.h
> b/arch/x86/include/asm/hypervisor.h index 0c6f7af..7a15153 100644
> --- a/arch/x86/include/asm/hypervisor.h
> +++ b/arch/x86/include/asm/hypervisor.h
> @@ -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;
> }
>
> diff --git a/arch/x86/include/asm/xen/hypervisor.h
> b/arch/x86/include/asm/xen/hypervisor.h index 396ff4c..66d0fff 100644
> --- a/arch/x86/include/asm/xen/hypervisor.h
> +++ b/arch/x86/include/asm/xen/hypervisor.h
> @@ -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 */
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 44dcad4..bb8aa31 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -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 +1365,17 @@ 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() && xen_feature(XENFEAT_hvm_pirqs) &&
> + xen_have_vector_callback)
> + return false;
> + return (xen_cpuid_base() != 0);
> +}
> +EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);
> +
> const __refconst struct hypervisor_x86 x86_hyper_xen_hvm = {
> .name = "Xen HVM",
> .detect = xen_hvm_platform,
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