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([2603:8081:c640:1::1007]) by smtp.gmail.com with ESMTPSA id 006d021491bc7-61e6feb11a7sm1347327eaf.10.2025.09.05.08.44.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 05 Sep 2025 08:44:01 -0700 (PDT) Message-ID: <64adc508-d18b-4075-835d-97ce5b68c4eb@gmail.com> Date: Fri, 5 Sep 2025 10:43:59 -0500 Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/6] mshv: Get the vmm capabilities offered by the hypervisor To: Nuno Das Neves , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, mhklinux@outlook.com, decui@microsoft.com, paekkaladevi@linux.microsoft.com References: <1756428230-3599-1-git-send-email-nunodasneves@linux.microsoft.com> <1756428230-3599-5-git-send-email-nunodasneves@linux.microsoft.com> Content-Language: en-US From: Praveen K Paladugu In-Reply-To: <1756428230-3599-5-git-send-email-nunodasneves@linux.microsoft.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 8/28/2025 7:43 PM, Nuno Das Neves wrote: > From: Purna Pavan Chandra Aekkaladevi > > Some newer hypervisor APIs are gated by feature bits in the so-called > "vmm capabilities" partition property. Store the capabilities on nit: s/xx/Some hypervisor APIs are gated by feature bits exposed in "vmm capabilities" partition property./g> mshv_root module init, using HVCALL_GET_PARTITION_PROPERTY_EX. > > Signed-off-by: Purna Pavan Chandra Aekkaladevi > Signed-off-by: Nuno Das Neves > --- > drivers/hv/mshv_root.h | 1 + > drivers/hv/mshv_root_main.c | 28 ++++++++++++++++++++++++++++ > 2 files changed, 29 insertions(+) > > diff --git a/drivers/hv/mshv_root.h b/drivers/hv/mshv_root.h > index 4aeb03bea6b6..0cb1e2589fe1 100644 > --- a/drivers/hv/mshv_root.h > +++ b/drivers/hv/mshv_root.h > @@ -178,6 +178,7 @@ struct mshv_root { > struct hv_synic_pages __percpu *synic_pages; > spinlock_t pt_ht_lock; > DECLARE_HASHTABLE(pt_htable, MSHV_PARTITIONS_HASH_BITS); > + struct hv_partition_property_vmm_capabilities vmm_caps; > }; > > /* > diff --git a/drivers/hv/mshv_root_main.c b/drivers/hv/mshv_root_main.c > index 56ababab57ce..29f61ecc9771 100644 > --- a/drivers/hv/mshv_root_main.c > +++ b/drivers/hv/mshv_root_main.c > @@ -2327,6 +2327,28 @@ static int __init mshv_root_partition_init(struct device *dev) > return err; > } > > +static int mshv_init_vmm_caps(struct device *dev) > +{ > + int ret; > + > + memset(&mshv_root.vmm_caps, 0, sizeof(mshv_root.vmm_caps)); > + ret = hv_call_get_partition_property_ex(HV_PARTITION_ID_SELF, > + HV_PARTITION_PROPERTY_VMM_CAPABILITIES, > + 0, &mshv_root.vmm_caps, > + sizeof(mshv_root.vmm_caps)); > + > + /* > + * HV_PARTITION_PROPERTY_VMM_CAPABILITIES is not supported in > + * older hyperv. Ignore the -EIO error code. > + */ > + if (ret && ret != -EIO) > + return ret; > + > + dev_dbg(dev, "vmm_caps=0x%llx\n", mshv_root.vmm_caps.as_uint64[0]); > + > + return 0; > +} > + > static int __init mshv_parent_partition_init(void) > { > int ret; > @@ -2377,6 +2399,12 @@ static int __init mshv_parent_partition_init(void) > if (ret) > goto remove_cpu_state; > > + ret = mshv_init_vmm_caps(dev); > + if (ret) { > + dev_err(dev, "Failed to get VMM capabilities\n"); > + goto exit_partition; > + } > + > ret = mshv_irqfd_wq_init(); > if (ret) > goto exit_partition; Reviewed-by: Praveen K Paladugu -- Regards, Praveen K Paladugu