linux-kernel - [PATCH V3 4/5] X86: Hyper-V: Consolidate code for converting cpumask to vpset

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Message-Id: <20180516215334.6547-4-kys@linuxonhyperv.com>
Date:   Wed, 16 May 2018 14:53:33 -0700
From:   kys@...uxonhyperv.com
To:     x86@...nel.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        olaf@...fle.de, apw@...onical.com, jasowang@...hat.com,
        tglx@...utronix.de, hpa@...or.com, sthemmin@...rosoft.com,
        Michael.H.Kelley@...rosoft.com, vkuznets@...hat.com
Cc:     "K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH V3 4/5] X86: Hyper-V: Consolidate code for converting cpumask to vpset

From: "K. Y. Srinivasan" <kys@...rosoft.com>

Consolidate code for converting cpumask to vpset.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
---
 arch/x86/hyperv/mmu.c | 43 ++-----------------------------------------
 1 file changed, 2 insertions(+), 41 deletions(-)

diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c
index adee39a7a3f2..c9cd28f0bae4 100644
--- a/arch/x86/hyperv/mmu.c
+++ b/arch/x86/hyperv/mmu.c
@@ -25,11 +25,7 @@ struct hv_flush_pcpu {
 struct hv_flush_pcpu_ex {
 	u64 address_space;
 	u64 flags;
-	struct {
-		u64 format;
-		u64 valid_bank_mask;
-		u64 bank_contents[];
-	} hv_vp_set;
+	struct hv_vpset hv_vp_set;
 	u64 gva_list[];
 };
 
@@ -70,41 +66,6 @@ static inline int fill_gva_list(u64 gva_list[], int offset,
 	return gva_n - offset;
 }
 
-/* Return the number of banks in the resulting vp_set */
-static inline int cpumask_to_vp_set(struct hv_flush_pcpu_ex *flush,
-				    const struct cpumask *cpus)
-{
-	int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1;
-
-	/* valid_bank_mask can represent up to 64 banks */
-	if (hv_max_vp_index / 64 >= 64)
-		return 0;
-
-	/*
-	 * Clear all banks up to the maximum possible bank as hv_flush_pcpu_ex
-	 * structs are not cleared between calls, we risk flushing unneeded
-	 * vCPUs otherwise.
-	 */
-	for (vcpu_bank = 0; vcpu_bank <= hv_max_vp_index / 64; vcpu_bank++)
-		flush->hv_vp_set.bank_contents[vcpu_bank] = 0;
-
-	/*
-	 * Some banks may end up being empty but this is acceptable.
-	 */
-	for_each_cpu(cpu, cpus) {
-		vcpu = hv_cpu_number_to_vp_number(cpu);
-		vcpu_bank = vcpu / 64;
-		vcpu_offset = vcpu % 64;
-		__set_bit(vcpu_offset, (unsigned long *)
-			  &flush->hv_vp_set.bank_contents[vcpu_bank]);
-		if (vcpu_bank >= nr_bank)
-			nr_bank = vcpu_bank + 1;
-	}
-	flush->hv_vp_set.valid_bank_mask = GENMASK_ULL(nr_bank - 1, 0);
-
-	return nr_bank;
-}
-
 static void hyperv_flush_tlb_others(const struct cpumask *cpus,
 				    const struct flush_tlb_info *info)
 {
@@ -240,7 +201,7 @@ static void hyperv_flush_tlb_others_ex(const struct cpumask *cpus,
 
 	if (!cpumask_equal(cpus, cpu_present_mask)) {
 		flush->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K;
-		nr_bank = cpumask_to_vp_set(flush, cpus);
+		nr_bank = cpumask_to_vpset(&(flush->hv_vp_set), cpus);
 	}
 
 	if (!nr_bank) {
-- 
2.17.0