From nobody Sat Oct 4 08:13:30 2025 Received: from mail-ej1-f73.google.com (mail-ej1-f73.google.com [209.85.218.73]) (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 89EF52E2298 for ; Tue, 19 Aug 2025 21:52:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755640349; cv=none; b=Yddhn5HNufYIwA1DYHfEno965r6c/9uhzIE9w5Z/58veYxYAJxCe07taEL/sJQkpxGgMZ7rX2B18q3tHEgo6PTIek66ZMtpk/eZDBrGhVs99JshkMbtnYV1dOXv9E6LwjgXmTTLg0MR5tTdfKxa2l3qyb31gL8bbTgzleeJPUCc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755640349; c=relaxed/simple; bh=iu6gKl2CIH0Do5wVBqGs+FISYJXVfUyFEZp0ZLhFP2w=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=thn/2sp/HL+15RDjrGQPcf7Wp8uRbW4LbOxuPdhPB31aHH2PeUUGSb+QfUn2iS/lYWt+QAwHhLHvQLOXF3i3KAkk0jE3z+U9QhSNSTtkvDnMM4d6oHendw6gOOftLqhn2E3Ig0Ond1asEKqK9Jyiy61VXMiBrSSEeZUFIYFHEIo= 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=U9VqVqey; arc=none smtp.client-ip=209.85.218.73 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="U9VqVqey" Received: by mail-ej1-f73.google.com with SMTP id a640c23a62f3a-afcb5f59d9fso22738066b.0 for ; Tue, 19 Aug 2025 14:52:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1755640346; x=1756245146; 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=W+DG7jBXGZxGQ4XuCOpRWmsZ2ZfXC/o78dYhqpKpX0Y=; b=U9VqVqeyxO39vlQMeIQ4a5OsNrkkZUj7jDLghHQxCr1SbcqTLld0WZBHqW4eKUivT8 EkVbfCcaEcpqQmFBsP1QDA5MDc764jxT501R1GOre+AMbq5l5VPSaWGDvCa1K0xmY1FD 2tDkAbyV3mj0dVtWGSUbnzaP/Sup4RTkIPXniZw6rHbYiNzz4UBT5QZZLqFLwuy+HFNq G+ZYIXbl8nx8PdRZTKm1uxKG88RjpGk6V1PPAZXF/iqZzDVLw0rAvHYscutpvwVjhS9g 6nnI+JhcR6bP97koT63s8v5yjNWW48qGAArkZu/r4Di5wW8YT0T5/Uc37Bkh58Vs0+WM Ee1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755640346; x=1756245146; 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=W+DG7jBXGZxGQ4XuCOpRWmsZ2ZfXC/o78dYhqpKpX0Y=; b=nrVgMWKOaheSHvbue1WQ8cWfheUDhRVNuTlLfWzz9vkRwwt66OUukR0jC9NodRMmSr FFGH8Bk2je47twQxY2yPZD6c8oIzgyQvLnnxAxZlypPgsRmzii0Q36DN7YPr2zxR9Yo2 BxgHjKRqXaOGgGRcTcluUobop9FkFw31QyF7P0S3J/XaYxHu2Vidpfh1RvfrV1upWJ1r jkt/+HUTYp/k9HiymMi+6X7UZfLA2GoX2tFhLf3rIcIlnG1DiRBdT1O8MMZzlCxKBMsb DfhYAL8uQIdfg7fKnW3JzgUdUHqf3KzQApo+5zf1U5lGdzUyrzveYk4AzGyLSPlkntza PWlg== X-Gm-Message-State: AOJu0YxRfTIqSAoB3K9r82cU8qfzP+LE9lAHuaEQy2In86Mx1FY78uCx jvhR3mavakiFmf27Si4plf645tR/K/JcffBEd8l8ANffhFkh85IsH3bAREJOOo10bNt12yjHV3J hLwwR1E8jICBtDlnKJyhe52Ml4a2CwdAWRygxGcHVm7iPsV96PbbGnkML3yjGWaquw/03b9r2bd yC+hDAdBRT1w50B0y7Tdyxl1H1fZw8N1lI0cr92mBKodX4kMqu6NKfmN0= X-Google-Smtp-Source: AGHT+IH9p4RnQonIqO2IvBstcQzhGwFgVqersbPBUPhqv5wCNXWBDT/LoPiy2B89sQst64Mbf5itUgGSgohDDQ== X-Received: from edc12.prod.google.com ([2002:a05:6402:460c:b0:61a:3e52:115a]) (user=smostafa job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:7fa3:b0:af9:23b:9f9 with SMTP id a640c23a62f3a-afdded25839mr293959566b.24.1755640345755; Tue, 19 Aug 2025 14:52:25 -0700 (PDT) Date: Tue, 19 Aug 2025 21:51:31 +0000 In-Reply-To: <20250819215156.2494305-1-smostafa@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250819215156.2494305-1-smostafa@google.com> X-Mailer: git-send-email 2.51.0.rc1.167.g924127e9c0-goog Message-ID: <20250819215156.2494305-4-smostafa@google.com> Subject: [PATCH v4 03/28] KVM: arm64: pkvm: Add pkvm_time_get() From: Mostafa Saleh To: linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev Cc: maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, robin.murphy@arm.com, jean-philippe@linaro.org, qperret@google.com, tabba@google.com, jgg@ziepe.ca, mark.rutland@arm.com, praan@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 | 33 ++++++++++++++++++++++++++ 3 files changed, 39 insertions(+) diff --git a/arch/arm64/kvm/hyp/include/nvhe/pkvm.h b/arch/arm64/kvm/hyp/in= clude/nvhe/pkvm.h index ce31d3b73603..6c19691720cd 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/pkvm.h +++ b/arch/arm64/kvm/hyp/include/nvhe/pkvm.h @@ -87,4 +87,6 @@ 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 a48d3f5a5afb..ee6435473204 100644 --- a/arch/arm64/kvm/hyp/nvhe/setup.c +++ b/arch/arm64/kvm/hyp/nvhe/setup.c @@ -304,6 +304,10 @@ 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..e166cd5a56b8 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 +72,32 @@ 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); + /* + * TODO: The highest privileged level is supposed to initialize this + * register. But on some systems (which?), this information is only + * contained in the device-tree, so we'll need to find it out some other + * way. + */ + 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 2.51.0.rc1.167.g924127e9c0-goog