linux-kernel - [RFC 25/48] RISC-V: KVM: Skip HVIP update for TVMs

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Date:   Wed, 19 Apr 2023 15:16:53 -0700
From:   Atish Patra <atishp@...osinc.com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atishp@...osinc.com>, Alexandre Ghiti <alex@...ti.fr>,
        Andrew Jones <ajones@...tanamicro.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Björn Töpel <bjorn@...osinc.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        linux-coco@...ts.linux.dev, Dylan Reid <dylan@...osinc.com>,
        abrestic@...osinc.com, Samuel Ortiz <sameo@...osinc.com>,
        Christoph Hellwig <hch@...radead.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guo Ren <guoren@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
        Jiri Slaby <jirislaby@...nel.org>,
        kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        Mayuresh Chitale <mchitale@...tanamicro.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rajnesh Kanwal <rkanwal@...osinc.com>,
        Uladzislau Rezki <urezki@...il.com>
Subject: [RFC 25/48] RISC-V: KVM: Skip HVIP update for TVMs

Skip HVIP update as the Host shouldn't be able to inject
interrupt directly to a TVM.

Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/kvm/vcpu.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index 43a0b8c..20d4800 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -822,7 +822,10 @@ void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu)
 	/* Read current HVIP and VSIE CSRs */
 	csr->vsie = nacl_csr_read(CSR_VSIE);
 
-	/* Sync-up HVIP.VSSIP bit changes does by Guest */
+	/*
+	 * Sync-up HVIP.VSSIP bit changes does by Guest. For TVMs,
+	 * the HVIP is not updated by the TSM. Expect it to be zero.
+	 */
 	hvip = nacl_csr_read(CSR_HVIP);
 	if ((csr->hvip ^ hvip) & (1UL << IRQ_VS_SOFT)) {
 		if (hvip & (1UL << IRQ_VS_SOFT)) {
@@ -1305,8 +1308,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
 		 */
 		kvm_riscv_vcpu_flush_interrupts(vcpu);
 
-		/* Update HVIP CSR for current CPU */
-		kvm_riscv_update_hvip(vcpu);
+		/* Update HVIP CSR for current CPU only for non TVMs */
+		if (!is_cove_vcpu(vcpu))
+			kvm_riscv_update_hvip(vcpu);
 
 		if (ret <= 0 ||
 		    kvm_riscv_gstage_vmid_ver_changed(vcpu->kvm) ||
-- 
2.25.1