linux-kernel - [tip:x86/hyperv] X86/Hyper-V: Consolidate the allocation of the hypercall input page

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Message-ID: <tip-9a2d78e291a7dea0ae4b4a06ce6bbbe4f1ab7c13@git.kernel.org>
Date:   Sat, 19 May 2018 04:29:48 -0700
From:   "tip-bot for K. Y. Srinivasan" <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...nel.org, kys@...rosoft.com,
        hpa@...or.com, mikelley@...rosoft.com, linux-kernel@...r.kernel.org
Subject: [tip:x86/hyperv] X86/Hyper-V: Consolidate the allocation of the
 hypercall input page

Commit-ID:  9a2d78e291a7dea0ae4b4a06ce6bbbe4f1ab7c13
Gitweb:     https://git.kernel.org/tip/9a2d78e291a7dea0ae4b4a06ce6bbbe4f1ab7c13
Author:     K. Y. Srinivasan <kys@...rosoft.com>
AuthorDate: Wed, 16 May 2018 14:53:34 -0700
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sat, 19 May 2018 13:23:18 +0200

X86/Hyper-V: Consolidate the allocation of the hypercall input page

Consolidate the allocation of the hypercall input page.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
Cc: olaf@...fle.de
Cc: sthemmin@...rosoft.com
Cc: gregkh@...uxfoundation.org
Cc: jasowang@...hat.com
Cc: Michael.H.Kelley@...rosoft.com
Cc: hpa@...or.com
Cc: apw@...onical.com
Cc: devel@...uxdriverproject.org
Cc: vkuznets@...hat.com
Link: https://lkml.kernel.org/r/20180516215334.6547-5-kys@linuxonhyperv.com

---
 arch/x86/hyperv/hv_init.c       |  2 --
 arch/x86/hyperv/mmu.c           | 30 ++++++------------------------
 arch/x86/include/asm/mshyperv.h |  1 -
 3 files changed, 6 insertions(+), 27 deletions(-)

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 6bc90d68ac8b..4c431e1c1eff 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -324,8 +324,6 @@ void __init hyperv_init(void)
 	hypercall_msr.guest_physical_address = vmalloc_to_pfn(hv_hypercall_pg);
 	wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
 
-	hyper_alloc_mmu();
-
 	hv_apic_init();
 
 	/*
diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c
index c9cd28f0bae4..5f053d7d1bd9 100644
--- a/arch/x86/hyperv/mmu.c
+++ b/arch/x86/hyperv/mmu.c
@@ -32,9 +32,6 @@ struct hv_flush_pcpu_ex {
 /* Each gva in gva_list encodes up to 4096 pages to flush */
 #define HV_TLB_FLUSH_UNIT (4096 * PAGE_SIZE)
 
-static struct hv_flush_pcpu __percpu **pcpu_flush;
-
-static struct hv_flush_pcpu_ex __percpu **pcpu_flush_ex;
 
 /*
  * Fills in gva_list starting from offset. Returns the number of items added.
@@ -77,7 +74,7 @@ static void hyperv_flush_tlb_others(const struct cpumask *cpus,
 
 	trace_hyperv_mmu_flush_tlb_others(cpus, info);
 
-	if (!pcpu_flush || !hv_hypercall_pg)
+	if (!hv_hypercall_pg)
 		goto do_native;
 
 	if (cpumask_empty(cpus))
@@ -85,10 +82,8 @@ static void hyperv_flush_tlb_others(const struct cpumask *cpus,
 
 	local_irq_save(flags);
 
-	flush_pcpu = this_cpu_ptr(pcpu_flush);
-
-	if (unlikely(!*flush_pcpu))
-		*flush_pcpu = page_address(alloc_page(GFP_ATOMIC));
+	flush_pcpu = (struct hv_flush_pcpu **)
+		     this_cpu_ptr(hyperv_pcpu_input_arg);
 
 	flush = *flush_pcpu;
 
@@ -164,7 +159,7 @@ static void hyperv_flush_tlb_others_ex(const struct cpumask *cpus,
 
 	trace_hyperv_mmu_flush_tlb_others(cpus, info);
 
-	if (!pcpu_flush_ex || !hv_hypercall_pg)
+	if (!hv_hypercall_pg)
 		goto do_native;
 
 	if (cpumask_empty(cpus))
@@ -172,10 +167,8 @@ static void hyperv_flush_tlb_others_ex(const struct cpumask *cpus,
 
 	local_irq_save(flags);
 
-	flush_pcpu = this_cpu_ptr(pcpu_flush_ex);
-
-	if (unlikely(!*flush_pcpu))
-		*flush_pcpu = page_address(alloc_page(GFP_ATOMIC));
+	flush_pcpu = (struct hv_flush_pcpu_ex **)
+		     this_cpu_ptr(hyperv_pcpu_input_arg);
 
 	flush = *flush_pcpu;
 
@@ -257,14 +250,3 @@ void hyperv_setup_mmu_ops(void)
 		pv_mmu_ops.flush_tlb_others = hyperv_flush_tlb_others_ex;
 	}
 }
-
-void hyper_alloc_mmu(void)
-{
-	if (!(ms_hyperv.hints & HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED))
-		return;
-
-	if (!(ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED))
-		pcpu_flush = alloc_percpu(struct hv_flush_pcpu *);
-	else
-		pcpu_flush_ex = alloc_percpu(struct hv_flush_pcpu_ex *);
-}
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 0ee82519957b..9aaa493f5756 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -294,7 +294,6 @@ static inline int cpumask_to_vpset(struct hv_vpset *vpset,
 
 void __init hyperv_init(void);
 void hyperv_setup_mmu_ops(void);
-void hyper_alloc_mmu(void);
 void hyperv_report_panic(struct pt_regs *regs, long err);
 bool hv_is_hyperv_initialized(void);
 void hyperv_cleanup(void);