Christian Borntraeger wrote:
>
> I agree. It seems I can simply remove the kvm_hypercall macro.
>
> Here is the updated patch (without the s390 parts. Will send them later
> when ready) and the changes mentioned above.
>
> Avi, Anthony, comments?
>
It looks good to me.
Regards,
Anthony Liguori
> [PATCH/RFC] Per-architecture hypercall definitions
>
> Currently kvm provides hypercalls only for x86* architectures. To
> provide hypercall infrastructure for other kvm architectures I split
> kvm_para.h into a generic header file and architecture specific
> definitions.
>
> Signed-off-by: Christian Borntraeger <[EMAIL PROTECTED]>
>
> Index: kvm/include/asm-x86/kvm_para.h
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ kvm/include/asm-x86/kvm_para.h 2007-10-11 15:41:24.000000000 +0200
> @@ -0,0 +1,105 @@
> +#ifndef __X86_KVM_PARA_H
> +#define __X86_KVM_PARA_H
> +
> +/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx. It
> + * should be used to determine that a VM is running under KVM.
> + */
> +#define KVM_CPUID_SIGNATURE 0x40000000
> +
> +/* This CPUID returns a feature bitmap in eax. Before enabling a particular
> + * paravirtualization, the appropriate feature bit should be checked.
> + */
> +#define KVM_CPUID_FEATURES 0x40000001
> +
> +#ifdef __KERNEL__
> +#include <asm/processor.h>
> +
> +/* This instruction is vmcall. On non-VT architectures, it will generate a
> + * trap that we will then rewrite to the appropriate instruction.
> + */
> +#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
> +
> +/* For KVM hypercalls, a three-byte sequence of either the vmrun or the
> vmmrun
> + * instruction. The hypervisor may replace it with something else but only
> the
> + * instructions are guaranteed to be supported.
> + *
> + * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
> + * The hypercall number should be placed in rax and the return value will be
> + * placed in rax. No other registers will be clobbered unless explicited
> + * noted by the particular hypercall.
> + */
> +
> +static inline long kvm_hypercall0(unsigned int nr)
> +{
> + long ret;
> + asm volatile(KVM_HYPERCALL
> + : "=a"(ret)
> + : "a"(nr));
> + return ret;
> +}
> +
> +static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
> +{
> + long ret;
> + asm volatile(KVM_HYPERCALL
> + : "=a"(ret)
> + : "a"(nr), "b"(p1));
> + return ret;
> +}
> +
> +static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
> + unsigned long p2)
> +{
> + long ret;
> + asm volatile(KVM_HYPERCALL
> + : "=a"(ret)
> + : "a"(nr), "b"(p1), "c"(p2));
> + return ret;
> +}
> +
> +static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
> + unsigned long p2, unsigned long p3)
> +{
> + long ret;
> + asm volatile(KVM_HYPERCALL
> + : "=a"(ret)
> + : "a"(nr), "b"(p1), "c"(p2), "d"(p3));
> + return ret;
> +}
> +
> +static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
> + unsigned long p2, unsigned long p3,
> + unsigned long p4)
> +{
> + long ret;
> + asm volatile(KVM_HYPERCALL
> + : "=a"(ret)
> + : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4));
> + return ret;
> +}
> +
> +static inline int kvm_para_available(void)
> +{
> + unsigned int eax, ebx, ecx, edx;
> + char signature[13];
> +
> + cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
> + memcpy(signature + 0, &ebx, 4);
> + memcpy(signature + 4, &ecx, 4);
> + memcpy(signature + 8, &edx, 4);
> + signature[12] = 0;
> +
> + if (strcmp(signature, "KVMKVMKVM") == 0)
> + return 1;
> +
> + return 0;
> +}
> +
> +static inline unsigned int kvm_arch_para_features(void)
> +{
> + return cpuid_eax(KVM_CPUID_FEATURES);
> +}
> +
> +#endif
> +
> +#endif
> Index: kvm/include/linux/kvm_para.h
> ===================================================================
> --- kvm.orig/include/linux/kvm_para.h 2007-10-11 13:28:46.000000000 +0200
> +++ kvm/include/linux/kvm_para.h 2007-10-11 15:41:53.000000000 +0200
> @@ -1,110 +1,29 @@
> #ifndef __LINUX_KVM_PARA_H
> #define __LINUX_KVM_PARA_H
>
> -/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx. It
> - * should be used to determine that a VM is running under KVM.
> +/*
> + * This header file provides a method for making a hypercall to the host
> + * Architectures should define:
> + * - kvm_hypercall0, kvm_hypercall1...
> + * - kvm_arch_para_features
> + * - kvm_para_available
> */
> -#define KVM_CPUID_SIGNATURE 0x40000000
> -
> -/* This CPUID returns a feature bitmap in eax. Before enabling a particular
> - * paravirtualization, the appropriate feature bit should be checked.
> - */
> -#define KVM_CPUID_FEATURES 0x40000001
>
> /* Return values for hypercalls */
> #define KVM_ENOSYS 1000
>
> #ifdef __KERNEL__
> -#include <asm/processor.h>
> -
> -/* This instruction is vmcall. On non-VT architectures, it will generate a
> - * trap that we will then rewrite to the appropriate instruction.
> - */
> -#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
> -
> -/* For KVM hypercalls, a three-byte sequence of either the vmrun or the
> vmmrun
> - * instruction. The hypervisor may replace it with something else but only
> the
> - * instructions are guaranteed to be supported.
> - *
> - * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
> - * The hypercall number should be placed in rax and the return value will be
> - * placed in rax. No other registers will be clobbered unless explicited
> - * noted by the particular hypercall.
> +/*
> + * hypercalls use architecture specific
> */
> -
> -static inline long kvm_hypercall0(unsigned int nr)
> -{
> - long ret;
> - asm volatile(KVM_HYPERCALL
> - : "=a"(ret)
> - : "a"(nr));
> - return ret;
> -}
> -
> -static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
> -{
> - long ret;
> - asm volatile(KVM_HYPERCALL
> - : "=a"(ret)
> - : "a"(nr), "b"(p1));
> - return ret;
> -}
> -
> -static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
> - unsigned long p2)
> -{
> - long ret;
> - asm volatile(KVM_HYPERCALL
> - : "=a"(ret)
> - : "a"(nr), "b"(p1), "c"(p2));
> - return ret;
> -}
> -
> -static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
> - unsigned long p2, unsigned long p3)
> -{
> - long ret;
> - asm volatile(KVM_HYPERCALL
> - : "=a"(ret)
> - : "a"(nr), "b"(p1), "c"(p2), "d"(p3));
> - return ret;
> -}
> -
> -static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
> - unsigned long p2, unsigned long p3,
> - unsigned long p4)
> -{
> - long ret;
> - asm volatile(KVM_HYPERCALL
> - : "=a"(ret)
> - : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4));
> - return ret;
> -}
> -
> -static inline int kvm_para_available(void)
> -{
> - unsigned int eax, ebx, ecx, edx;
> - char signature[13];
> -
> - cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
> - memcpy(signature + 0, &ebx, 4);
> - memcpy(signature + 4, &ecx, 4);
> - memcpy(signature + 8, &edx, 4);
> - signature[12] = 0;
> -
> - if (strcmp(signature, "KVMKVMKVM") == 0)
> - return 1;
> -
> - return 0;
> -}
> +#include <asm/kvm_para.h>
>
> static inline int kvm_para_has_feature(unsigned int feature)
> {
> - if (cpuid_eax(KVM_CPUID_FEATURES) & (1UL << feature))
> + if (kvm_arch_para_features() & (1UL << feature))
> return 1;
> return 0;
> }
> +#endif /* __KERNEL__ */
> +#endif /* __LINUX_KVM_PARA_H */
>
> -#endif
> -
> -#endif
>
>
>
>
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