From nobody Tue Dec 2 03:00:11 2025 Received: from mail-wm1-f73.google.com (mail-wm1-f73.google.com [209.85.128.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3E21832C943 for ; Mon, 17 Nov 2025 18:48:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763405312; cv=none; b=UJWWOwDhIFEBDkNOnqRqzl0Ve/U+GbSwuLnRJ4roKr39Ej/bVFcbD2mRLSJQC1vUE1ieU+8IphXJTzrwvcelFj0E45PBcf6TTIt1iekzYFsyNLcXXJKaNjOGR36yiXbIZFV7H1VWWh25b8/goCUupiuYD27QWvw3QahMTPeJEbA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763405312; c=relaxed/simple; bh=S/1TCoG4iWrrYeaePo4/lgi9pJbViEDsshc6JJsQ2aA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=ZdcRn0colQ7JbCwNO74Et1wmJlUo7m+LfDehxL7seL1xnO6GMc1BKqi5s9ztoLE9GXUUyXJnG9VJhk5kHMhFyVLRrGYvziQiKy82bM1zZLVlj9WBQp4jYpZx3Ad1zAB4d4ys0n5RlvGR+NaBO4L8RpbyUl0mM561rrTCnn5xqSY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--smostafa.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=lsLg3Zth; arc=none smtp.client-ip=209.85.128.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--smostafa.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="lsLg3Zth" Received: by mail-wm1-f73.google.com with SMTP id 5b1f17b1804b1-47777158a85so41835515e9.3 for ; Mon, 17 Nov 2025 10:48:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1763405308; x=1764010108; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=mdiIv9AzHH9LJUmk1x5XNuh2D17ItySFVQ+lpR2xjRw=; b=lsLg3Zth84ipCefndg5yrTft/9rK1cojfyimWfVYcyCjWqSL9S11iw/2jXCfqln84y Xawd8iEcP4Y6gL0uJTZ0JZfZd6c39HIIx3zGnMB7NL5Ah9eXwz3UD4RqYxDcd5+nuCzR fCumRYgS0+pmIG/utmCMvBUq3ZayhlMGwdC6S9Ppq7oIOlmJPjEImG8rV68DP8jJ+JwZ zWRk0DD3Ds16fbb08I4DylIjbh8NXyIXegtE0wZqW0FSRm8Rf0b4z6Px3SgEQ9fG1ILs vv8TEnTiYH6DbCKkjWFgVDiLanfxkmINs4H9HMDCF3ei2EYDrdWO1+t2uFfh0I57sGu7 Wjmg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763405308; x=1764010108; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=mdiIv9AzHH9LJUmk1x5XNuh2D17ItySFVQ+lpR2xjRw=; b=mhjC3YwEjXUdGqmXyGbkfq1Eeq4cqEGzD/PykaxXl6ySTXPF9gQGpGHOOoWphurKGb pe7WzFXJrh2BQr2frh6a8rOZocbYq+8VZYwQ9U2v3EFiMk3Mb5pupb0yBcc2rzTnTKRk Tt9KH6gvJ0m1QiP2LsxvorZlxtwB6m8yR/xL3zdcbORKw3tE4aajIxyOARY91iw/X4nM CxK8S8As1MoYKzsiqSArk+RQNQzGTRXzI3D9jddFtg2x5ah3qpeQUw3ly8YmjiN21cxh AeBsL4gVOz2Me0M2GLDHBqy+DCMP+JO3NIp6gDkKOtdN4UkdInrOvRH3p7/jjL52iGsx PAKw== X-Forwarded-Encrypted: i=1; AJvYcCXI9JB4aF/J05KYrSxSGHHXyt4wXSy1LkEjP2GGemxy50vY6OXYgUlpm1pbbdEFwS86bEfFfvDUJ23KoWA=@vger.kernel.org X-Gm-Message-State: AOJu0YzTj4kWGdH0/m3pGMP4XHuSmzlvUrjLp7PtmtfvC3sS/9M4VM1U aoK8n3s/2ztAndT3i9cD8Kqhznm2MFWeArysXp3G1IkKMuvrU0cRnCAP8gOzMZ4SAOxaNBftzRV OP0UG0E2Qnmzxmw== X-Google-Smtp-Source: AGHT+IEIO6NZXXPWg9+hR4+SPtTpCKpBv3Ky3OdW45sXPemfU0CwllktSYR7niEb66Ks+RCqsCJfiR5agNLU5w== X-Received: from wmbgx23.prod.google.com ([2002:a05:600c:8597:b0:477:a0a1:eae8]) (user=smostafa job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:8b4b:b0:477:639d:bca2 with SMTP id 5b1f17b1804b1-4778fe51eb3mr117363365e9.4.1763405308662; Mon, 17 Nov 2025 10:48:28 -0800 (PST) Date: Mon, 17 Nov 2025 18:47:50 +0000 In-Reply-To: <20251117184815.1027271-1-smostafa@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251117184815.1027271-1-smostafa@google.com> X-Mailer: git-send-email 2.52.0.rc1.455.g30608eb744-goog Message-ID: <20251117184815.1027271-4-smostafa@google.com> Subject: [PATCH v5 03/27] KVM: arm64: pkvm: Add pkvm_time_get() From: Mostafa Saleh To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, iommu@lists.linux.dev Cc: catalin.marinas@arm.com, will@kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, joro@8bytes.org, jean-philippe@linaro.org, jgg@ziepe.ca, praan@google.com, danielmentz@google.com, mark.rutland@arm.com, qperret@google.com, tabba@google.com, Mostafa Saleh Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a function to return time in us. This can be used from IOMMU drivers while waiting for conditions as for SMMUv3 TLB invalidation waiting for sync. Signed-off-by: Mostafa Saleh Signed-off-by: Jean-Philippe Brucker --- arch/arm64/kvm/hyp/include/nvhe/pkvm.h | 2 ++ arch/arm64/kvm/hyp/nvhe/setup.c | 4 ++++ arch/arm64/kvm/hyp/nvhe/timer-sr.c | 32 ++++++++++++++++++++++++++ 3 files changed, 38 insertions(+) diff --git a/arch/arm64/kvm/hyp/include/nvhe/pkvm.h b/arch/arm64/kvm/hyp/in= clude/nvhe/pkvm.h index 184ad7a39950..2b065e048a35 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/pkvm.h +++ b/arch/arm64/kvm/hyp/include/nvhe/pkvm.h @@ -89,4 +89,6 @@ bool kvm_handle_pvm_restricted(struct kvm_vcpu *vcpu, u64= *exit_code); void kvm_init_pvm_id_regs(struct kvm_vcpu *vcpu); int kvm_check_pvm_sysreg_table(void); =20 +int pkvm_timer_init(void); +u64 pkvm_time_get(void); #endif /* __ARM64_KVM_NVHE_PKVM_H__ */ diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setu= p.c index 90bd014e952f..eff76be89329 100644 --- a/arch/arm64/kvm/hyp/nvhe/setup.c +++ b/arch/arm64/kvm/hyp/nvhe/setup.c @@ -312,6 +312,10 @@ void __noreturn __pkvm_init_finalise(void) }; pkvm_pgtable.mm_ops =3D &pkvm_pgtable_mm_ops; =20 + ret =3D pkvm_timer_init(); + if (ret) + goto out; + ret =3D fix_host_ownership(); if (ret) goto out; diff --git a/arch/arm64/kvm/hyp/nvhe/timer-sr.c b/arch/arm64/kvm/hyp/nvhe/t= imer-sr.c index ff176f4ce7de..ce91719c876d 100644 --- a/arch/arm64/kvm/hyp/nvhe/timer-sr.c +++ b/arch/arm64/kvm/hyp/nvhe/timer-sr.c @@ -11,6 +11,10 @@ #include #include =20 +#include + +static u32 timer_freq; + void __kvm_timer_set_cntvoff(u64 cntvoff) { write_sysreg(cntvoff, cntvoff_el2); @@ -68,3 +72,31 @@ void __timer_enable_traps(struct kvm_vcpu *vcpu) =20 sysreg_clear_set(cnthctl_el2, clr, set); } + +static u64 pkvm_ticks_get(void) +{ + return __arch_counter_get_cntvct(); +} + +#define SEC_TO_US 1000000 + +int pkvm_timer_init(void) +{ + timer_freq =3D read_sysreg(cntfrq_el0); + + /* + * KVM will not initialize if FW didn't set cntfrq_el0, that is already + * part of the boot protocol. + */ + if (!timer_freq || timer_freq < SEC_TO_US) + return -ENODEV; + return 0; +} + +#define pkvm_time_ticks_to_us(ticks) ((u64)(ticks) * SEC_TO_US / timer_fre= q) + +/* Return time in us. */ +u64 pkvm_time_get(void) +{ + return pkvm_time_ticks_to_us(pkvm_ticks_get()); +} --=20 2.52.0.rc1.455.g30608eb744-goog