From: Tianyu Lan <ltykernel@gmail.com>
To: Dexuan Cui <decui@microsoft.com>,
ak@linux.intel.com, arnd@arndb.de, bp@alien8.de,
brijesh.singh@amd.com, dan.j.williams@intel.com,
dave.hansen@intel.com, dave.hansen@linux.intel.com,
haiyangz@microsoft.com, hpa@zytor.com, jane.chu@oracle.com,
kirill.shutemov@linux.intel.com, kys@microsoft.com,
linux-hyperv@vger.kernel.org, luto@kernel.org, mingo@redhat.com,
peterz@infradead.org, rostedt@goodmis.org,
sathyanarayanan.kuppuswamy@linux.intel.com, seanjc@google.com,
tglx@linutronix.de, tony.luck@intel.com, wei.liu@kernel.org,
Jason@zx2c4.com, nik.borisov@suse.com, mikelley@microsoft.com
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, Tianyu.Lan@microsoft.com,
rick.p.edgecombe@intel.com, andavis@redhat.com,
mheslin@redhat.com, vkuznets@redhat.com, xiaoyao.li@intel.com
Subject: Re: [PATCH v3 07/10] Drivers: hv: vmbus: Bring the post_msg_page back for TDX VMs with the paravisor
Date: Thu, 24 Aug 2023 22:40:35 +0800 [thread overview]
Message-ID: <a124df72-4231-4589-cd2b-4c0a77fab975@gmail.com> (raw)
In-Reply-To: <20230824080712.30327-8-decui@microsoft.com>
On 8/24/2023 4:07 PM, Dexuan Cui wrote:
> The post_msg_page was removed in
> commit 9a6b1a170ca8 ("Drivers: hv: vmbus: Remove the per-CPU post_msg_page")
>
> However, it turns out that we need to bring it back, but only for a TDX VM
> with the paravisor: in such a VM, the hyperv_pcpu_input_arg is not decrypted,
> but the HVCALL_POST_MESSAGE in such a VM needs a decrypted page as the
> hypercall input page: see the comments in hyperv_init() for a detailed
> explanation.
>
> Except for HVCALL_POST_MESSAGE and HVCALL_SIGNAL_EVENT, the other hypercalls
> in a TDX VM with the paravisor still use hv_hypercall_pg and must use the
> hyperv_pcpu_input_arg (which is encrypted in such a VM), when a hypercall
> input page is used.
>
> Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
next prev parent reply other threads:[~2023-08-24 14:41 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-24 8:07 [PATCH v3 00/10] Support TDX guests on Hyper-V (the Hyper-V specific part) Dexuan Cui
2023-08-24 8:07 ` [PATCH v3 01/10] x86/hyperv: Add hv_isolation_type_tdx() to detect TDX guests Dexuan Cui
2023-08-24 8:07 ` [PATCH v3 02/10] x86/hyperv: Support hypercalls for fully enlightened " Dexuan Cui
2023-08-24 8:07 ` [PATCH v3 03/10] Drivers: hv: vmbus: Support " Dexuan Cui
2023-08-24 8:07 ` [PATCH v3 04/10] x86/hyperv: Fix serial console interrupts for " Dexuan Cui
2023-08-24 8:07 ` [PATCH v3 05/10] Drivers: hv: vmbus: Support >64 VPs for a fully enlightened TDX/SNP VM Dexuan Cui
2023-08-24 8:07 ` [PATCH v3 06/10] x86/hyperv: Introduce a global variable hyperv_paravisor_present Dexuan Cui
2023-08-24 14:06 ` Michael Kelley (LINUX)
2023-08-24 14:41 ` Tianyu Lan
2023-08-24 8:07 ` [PATCH v3 07/10] Drivers: hv: vmbus: Bring the post_msg_page back for TDX VMs with the paravisor Dexuan Cui
2023-08-24 14:07 ` Michael Kelley (LINUX)
2023-08-24 14:40 ` Tianyu Lan [this message]
2023-08-24 8:07 ` [PATCH v3 08/10] x86/hyperv: Use TDX GHCI to access some MSRs in a TDX VM " Dexuan Cui
2023-08-24 14:08 ` Michael Kelley (LINUX)
2023-08-24 14:44 ` Tianyu Lan
2023-12-04 15:10 ` Dave Hansen
2024-01-17 2:22 ` Wei Liu
2023-08-24 8:07 ` [PATCH v3 09/10] x86/hyperv: Remove hv_isolation_type_en_snp Dexuan Cui
2023-08-24 14:09 ` Michael Kelley (LINUX)
2023-08-24 14:45 ` Tianyu Lan
2023-08-24 8:07 ` [PATCH v3 10/10] x86/hyperv: Move the code in ivm.c around to avoid unnecessary ifdef's Dexuan Cui
2023-08-24 14:10 ` Michael Kelley (LINUX)
2023-08-24 14:46 ` Tianyu Lan
2023-08-25 0:05 ` [PATCH v3 00/10] Support TDX guests on Hyper-V (the Hyper-V specific part) Wei Liu
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