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Message-ID: <48427079-52cf-d6c7-718b-7f0b33a724bb@intel.com>
Date: Wed, 16 Mar 2022 15:06:23 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
luto@...nel.org, peterz@...radead.org
Cc: sathyanarayanan.kuppuswamy@...ux.intel.com, aarcange@...hat.com,
ak@...ux.intel.com, dan.j.williams@...el.com, david@...hat.com,
hpa@...or.com, jgross@...e.com, jmattson@...gle.com,
joro@...tes.org, jpoimboe@...hat.com, knsathya@...nel.org,
pbonzini@...hat.com, sdeep@...are.com, seanjc@...gle.com,
tony.luck@...el.com, vkuznets@...hat.com, wanpengli@...cent.com,
thomas.lendacky@....com, brijesh.singh@....com, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCHv6 25/30] x86/tdx: Make pages shared in ioremap()
On 3/15/22 19:08, Kirill A. Shutemov wrote:
> In TDX guests, guest memory is protected from host access. If a guest
> performs I/O, it needs to explicitly share the I/O memory with the host.
>
> Make all ioremap()ed pages that are not backed by normal memory
> (IORES_DESC_NONE or IORES_DESC_RESERVED) mapped as shared.
>
> The permissions in PAGE_KERNEL_IO already work for "decrypted" memory
> on AMD SEV/SME systems. That means that they have no need to make a
> pgprot_decrypted() call.
>
> TDX guests, on the other hand, _need_ change to PAGE_KERNEL_IO for
> "decrypted" mappings. Add a pgprot_decrypted() for TDX.
Reviewed-by: Dave Hansen <dave.hansen@...ux.intel.com>
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