From: "Michael Kelley (LINUX)" <mikelley@microsoft.com>
To: Dexuan Cui <decui@microsoft.com>,
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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 14:07:23 +0000 [thread overview]
Message-ID: <BYAPR21MB1688C7407CB6BA9A540F5683D71DA@BYAPR21MB1688.namprd21.prod.outlook.com> (raw)
In-Reply-To: <20230824080712.30327-8-decui@microsoft.com>
From: Dexuan Cui <decui@microsoft.com> Sent: Thursday, August 24, 2023 1:07 AM
>
> 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>
> ---
>
> Changes in v2: None
>
> Changes in v3:
> hyperv_paravisor_present -> ms_hyperv.paravisor_present
>
> arch/x86/hyperv/hv_init.c | 20 +++++++++++--
> drivers/hv/hv.c | 59 +++++++++++++++++++++++++++++++++++----
> drivers/hv/hyperv_vmbus.h | 11 ++++++++
> 3 files changed, 82 insertions(+), 8 deletions(-)
>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
next prev parent reply other threads:[~2023-08-24 14:08 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) [this message]
2023-08-24 14:40 ` Tianyu Lan
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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