From: "Arnd Bergmann" <arnd@arndb.de>
To: "Roman Kisel" <romank@linux.microsoft.com>,
bhelgaas@google.com, "Borislav Petkov" <bp@alien8.de>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Conor Dooley" <conor+dt@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Dexuan Cui" <decui@microsoft.com>,
"Haiyang Zhang" <haiyangz@microsoft.com>,
"H. Peter Anvin" <hpa@zytor.com>,
krzk+dt@kernel.org, "Krzysztof Wilczyński" <kw@linux.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Manivannan Sadhasivam" <manivannan.sadhasivam@linaro.org>,
"Ingo Molnar" <mingo@redhat.com>, "Rob Herring" <robh@kernel.org>,
ssengar@linux.microsoft.com,
"Thomas Gleixner" <tglx@linutronix.de>,
"Wei Liu" <wei.liu@kernel.org>, "Will Deacon" <will@kernel.org>,
devicetree@vger.kernel.org,
Linux-Arch <linux-arch@vger.kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pci@vger.kernel.org, x86@kernel.org
Cc: benhill@microsoft.com, bperkins@microsoft.com, sunilmut@microsoft.com
Subject: Re: [PATCH hyperv-next v4 1/6] arm64: hyperv: Use SMCCC to detect hypervisor presence
Date: Wed, 12 Feb 2025 07:54:47 +0100 [thread overview]
Message-ID: <1b14e3de-4d3e-420c-819c-31ffb2d448bd@app.fastmail.com> (raw)
In-Reply-To: <20250212014321.1108840-2-romank@linux.microsoft.com>
On Wed, Feb 12, 2025, at 02:43, Roman Kisel wrote:
> +static bool hyperv_detect_via_smccc(void)
> +{
> + struct arm_smccc_res res = {};
> +
> + if (arm_smccc_1_1_get_conduit() != SMCCC_CONDUIT_HVC)
> + return false;
> + arm_smccc_1_1_hvc(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res);
> + if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
> + return false;
> +
> + return res.a0 == ARM_SMCCC_VENDOR_HYP_UID_HYPERV_REG_0 &&
> + res.a1 == ARM_SMCCC_VENDOR_HYP_UID_HYPERV_REG_1 &&
> + res.a2 == ARM_SMCCC_VENDOR_HYP_UID_HYPERV_REG_2 &&
> + res.a3 == ARM_SMCCC_VENDOR_HYP_UID_HYPERV_REG_3;
> +}
I had to double-check that this function is safe to call on
other hypervisors, at least when they follow the smccc spec.
Seeing that we have the same helper function checking for
ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_* and there was another
patch set adding a copy for gunyah, I wonder if we can
put this into a drivers/firmware/smccc/smccc.c directly
the same way we handle soc_id, and make it return a uuid_t,
or perhaps take a constant uuid_t to compare against.
Arnd
next prev parent reply other threads:[~2025-02-12 6:55 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-12 1:43 [PATCH hyperv-next v4 0/6] arm64: hyperv: Support Virtual Trust Level Boot Roman Kisel
2025-02-12 1:43 ` [PATCH hyperv-next v4 1/6] arm64: hyperv: Use SMCCC to detect hypervisor presence Roman Kisel
2025-02-12 6:54 ` Arnd Bergmann [this message]
2025-02-13 23:23 ` Roman Kisel
2025-02-14 8:05 ` Arnd Bergmann
2025-02-14 16:47 ` Roman Kisel
2025-02-24 23:22 ` Roman Kisel
2025-02-25 7:24 ` Arnd Bergmann
2025-02-25 22:25 ` Roman Kisel
2025-02-26 13:57 ` Arnd Bergmann
2025-02-19 23:13 ` Michael Kelley
2025-02-20 16:34 ` Roman Kisel
2025-02-12 1:43 ` [PATCH hyperv-next v4 2/6] Drivers: hv: Enable VTL mode for arm64 Roman Kisel
2025-02-19 23:14 ` Michael Kelley
2025-02-20 16:36 ` Roman Kisel
2025-02-12 1:43 ` [PATCH hyperv-next v4 3/6] Drivers: hv: Provide arch-neutral implementation of get_vtl() Roman Kisel
2025-02-19 23:17 ` Michael Kelley
2025-02-12 1:43 ` [PATCH hyperv-next v4 4/6] dt-bindings: microsoft,vmbus: Add GIC and DMA coherence to the example Roman Kisel
2025-02-12 6:42 ` Krzysztof Kozlowski
2025-02-12 23:57 ` Roman Kisel
2025-02-13 20:50 ` Roman Kisel
2025-02-12 1:43 ` [PATCH hyperv-next v4 5/6] Drivers: hv: vmbus: Get the IRQ number from DeviceTree Roman Kisel
2025-02-19 23:20 ` Michael Kelley
2025-02-12 1:43 ` [PATCH hyperv-next v4 6/6] PCI: hv: Get vPCI MSI IRQ domain " Roman Kisel
2025-02-12 17:42 ` Bjorn Helgaas
2025-02-18 22:32 ` Roman Kisel
2025-02-19 23:51 ` Roman Kisel
2025-02-19 23:29 ` Michael Kelley
2025-02-20 16:41 ` Roman Kisel
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