From 1268ed0c474a5c8f165ef386f3310521b5e00e27 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Tue, 3 Jul 2018 16:01:55 -0700 Subject: x86/hyper-v: Fix the circular dependency in IPI enlightenment The IPI hypercalls depend on being able to map the Linux notion of CPU ID to the hypervisor's notion of the CPU ID. The array hv_vp_index[] provides this mapping. Code for populating this array depends on the IPI functionality. Break this circular dependency. [ tglx: Use a proper define instead of '-1' with a u32 variable as pointed out by Vitaly ] Fixes: 68bb7bfb7985 ("X86/Hyper-V: Enable IPI enlightenments") Signed-off-by: K. Y. Srinivasan Signed-off-by: Thomas Gleixner Tested-by: Michael Kelley Cc: gregkh@linuxfoundation.org Cc: devel@linuxdriverproject.org Cc: olaf@aepfle.de Cc: apw@canonical.com Cc: jasowang@redhat.com Cc: hpa@zytor.com Cc: sthemmin@microsoft.com Cc: Michael.H.Kelley@microsoft.com Cc: vkuznets@redhat.com Link: https://lkml.kernel.org/r/20180703230155.15160-1-kys@linuxonhyperv.com --- arch/x86/include/asm/mshyperv.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'arch/x86/include') diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 3cd14311edfa..5a7375ed5f7c 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -9,6 +9,8 @@ #include #include +#define VP_INVAL U32_MAX + struct ms_hyperv_info { u32 features; u32 misc_features; @@ -20,7 +22,6 @@ struct ms_hyperv_info { extern struct ms_hyperv_info ms_hyperv; - /* * Generate the guest ID. */ @@ -281,6 +282,8 @@ static inline int cpumask_to_vpset(struct hv_vpset *vpset, */ for_each_cpu(cpu, cpus) { vcpu = hv_cpu_number_to_vp_number(cpu); + if (vcpu == VP_INVAL) + return -1; vcpu_bank = vcpu / 64; vcpu_offset = vcpu % 64; __set_bit(vcpu_offset, (unsigned long *) -- cgit v1.2.3