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From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
	Arnd Bergmann <arnd@arndb.de>
Cc: Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-hyperv@vger.kernel.org,
	linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
	Ajay Garg <ajaygargnsit@gmail.com>
Subject: [PATCH v2 3/8] KVM: x86: Refactor kvm_hv_flush_tlb() to reduce indentation
Date: Fri, 29 Oct 2021 17:07:55 -0700	[thread overview]
Message-ID: <20211030000800.3065132-4-seanjc@google.com> (raw)
In-Reply-To: <20211030000800.3065132-1-seanjc@google.com>

Refactor the "extended" path of kvm_hv_flush_tlb() to reduce the nesting
depth for the non-fast sparse path, and to make the code more similar to
the extended path in kvm_hv_send_ipi().

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/hyperv.c | 40 +++++++++++++++++++++-------------------
 1 file changed, 21 insertions(+), 19 deletions(-)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index cf18aa1712bf..e68931ed27f6 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1814,31 +1814,33 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc, bool
 		if (hc->var_cnt != bitmap_weight((unsigned long *)&valid_bank_mask, 64))
 			return HV_STATUS_INVALID_HYPERCALL_INPUT;
 
-		if (!hc->var_cnt && !all_cpus)
+		if (all_cpus)
+			goto do_flush;
+
+		if (!hc->var_cnt)
 			goto ret_success;
 
-		if (!all_cpus) {
-			if (hc->fast) {
-				if (hc->var_cnt > HV_HYPERCALL_MAX_XMM_REGISTERS - 1)
-					return HV_STATUS_INVALID_HYPERCALL_INPUT;
-				for (i = 0; i < hc->var_cnt; i += 2) {
-					sparse_banks[i] = sse128_lo(hc->xmm[i / 2 + 1]);
-					sparse_banks[i + 1] = sse128_hi(hc->xmm[i / 2 + 1]);
-				}
-			} else {
-				if (hc->var_cnt > 64)
-					return HV_STATUS_INVALID_HYPERCALL_INPUT;
-
-				gpa = hc->ingpa + offsetof(struct hv_tlb_flush_ex,
-							   hv_vp_set.bank_contents);
-				if (unlikely(kvm_read_guest(kvm, gpa, sparse_banks,
-							    hc->var_cnt *
-							    sizeof(sparse_banks[0]))))
-					return HV_STATUS_INVALID_HYPERCALL_INPUT;
+		if (hc->fast) {
+			if (hc->var_cnt > HV_HYPERCALL_MAX_XMM_REGISTERS - 1)
+				return HV_STATUS_INVALID_HYPERCALL_INPUT;
+			for (i = 0; i < hc->var_cnt; i += 2) {
+				sparse_banks[i] = sse128_lo(hc->xmm[i / 2 + 1]);
+				sparse_banks[i + 1] = sse128_hi(hc->xmm[i / 2 + 1]);
 			}
+			goto do_flush;
 		}
+
+		if (hc->var_cnt > 64)
+			return HV_STATUS_INVALID_HYPERCALL_INPUT;
+
+		gpa = hc->ingpa + offsetof(struct hv_tlb_flush_ex,
+					   hv_vp_set.bank_contents);
+		if (unlikely(kvm_read_guest(kvm, gpa, sparse_banks,
+					    hc->var_cnt * sizeof(sparse_banks[0]))))
+			return HV_STATUS_INVALID_HYPERCALL_INPUT;
 	}
 
+do_flush:
 	/*
 	 * vcpu->arch.cr3 may not be up-to-date for running vCPUs so we can't
 	 * analyze it here, flush TLB regardless of the specified address space.
-- 
2.33.1.1089.g2158813163f-goog


  parent reply	other threads:[~2021-10-30  0:08 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-30  0:07 [PATCH v2 0/8] KVM: x86: Hyper-V hypercall fix and cleanups Sean Christopherson
2021-10-30  0:07 ` [PATCH v2 1/8] KVM: x86: Ignore sparse banks size for an "all CPUs", non-sparse IPI req Sean Christopherson
2021-11-01  9:05   ` Vitaly Kuznetsov
2021-10-30  0:07 ` [PATCH v2 2/8] KVM: x86: Get the number of Hyper-V sparse banks from the VARHEAD field Sean Christopherson
2021-11-01  9:52   ` Vitaly Kuznetsov
2021-10-30  0:07 ` Sean Christopherson [this message]
2021-11-01 10:00   ` [PATCH v2 3/8] KVM: x86: Refactor kvm_hv_flush_tlb() to reduce indentation Vitaly Kuznetsov
2021-12-03 23:45     ` Sean Christopherson
2021-10-30  0:07 ` [PATCH v2 4/8] KVM: x86: Add a helper to get the sparse VP_SET for IPIs and TLB flushes Sean Christopherson
2021-11-01 10:06   ` Vitaly Kuznetsov
2021-10-30  0:07 ` [PATCH v2 5/8] KVM: x86: Don't bother reading sparse banks that end up being ignored Sean Christopherson
2021-11-01  9:46   ` Vitaly Kuznetsov
2021-10-30  0:07 ` [PATCH v2 6/8] KVM: x86: Shove vp_bitmap handling down into sparse_set_to_vcpu_mask() Sean Christopherson
2021-11-01 10:12   ` Vitaly Kuznetsov
2021-10-30  0:07 ` [PATCH v2 7/8] KVM: x86: Reject fixeds-size Hyper-V hypercalls with non-zero "var_cnt" Sean Christopherson
2021-11-01 10:27   ` Vitaly Kuznetsov
2021-12-03 23:48     ` Sean Christopherson
2021-10-30  0:08 ` [PATCH v2 8/8] KVM: x86: Add checks for reserved-to-zero Hyper-V hypercall fields Sean Christopherson
2021-11-01 10:33   ` Vitaly Kuznetsov
2021-12-02  2:13     ` Sean Christopherson
2021-12-02 15:16       ` Michael Kelley (LINUX)
2021-12-03 14:09         ` ** POTENTIAL FRAUD ALERT - RED HAT ** " Vitaly Kuznetsov

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