From: Tom Lendacky <thomas.lendacky@amd.com>
To: Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>
Cc: Peter H Anvin <hpa@zytor.com>,
Dave Hansen <dave.hansen@intel.com>,
Tony Luck <tony.luck@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Andi Kleen <ak@linux.intel.com>,
Kirill Shutemov <kirill.shutemov@linux.intel.com>,
Sean Christopherson <seanjc@google.com>,
Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 6/7] x86/kvm: Use bounce buffers for TD guest
Date: Fri, 11 Jun 2021 09:52:49 -0500 [thread overview]
Message-ID: <5f4dd90d-3761-3e1d-4f7b-86f504f769ae@amd.com> (raw)
In-Reply-To: <20210609215537.1956150-7-sathyanarayanan.kuppuswamy@linux.intel.com>
On 6/9/21 4:55 PM, Kuppuswamy Sathyanarayanan wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
> diff --git a/arch/x86/mm/mem_encrypt_common.c b/arch/x86/mm/mem_encrypt_common.c
> index 8053b43298ff..2da70f58b208 100644
> --- a/arch/x86/mm/mem_encrypt_common.c
> +++ b/arch/x86/mm/mem_encrypt_common.c
> @@ -9,6 +9,7 @@
>
> #include <asm/mem_encrypt_common.h>
> #include <linux/dma-mapping.h>
> +#include <linux/swiotlb.h>
>
> /* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */
> bool force_dma_unencrypted(struct device *dev)
> @@ -21,3 +22,18 @@ bool force_dma_unencrypted(struct device *dev)
>
> return false;
> }
> +
> +/* Architecture __weak replacement functions */
> +void __init mem_encrypt_init(void)
> +{
> + /*
> + * For TDX guest or SEV/SME, call into SWIOTLB to update
> + * the SWIOTLB DMA buffers
> + */
> + if (sme_me_mask || prot_guest_has(PR_GUEST_MEM_ENCRYPT))
> + swiotlb_update_mem_attributes();
> +
> + if (sme_me_mask)
> + amd_mem_encrypt_init();
The sme_me_mask is checked in amd_mem_encrypt_init(), so you should just
invoke amd_mem_encrypt_init() unconditionally.
Thanks,
Tom
> +}
> +
>
next prev parent reply other threads:[~2021-06-11 14:53 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-09 21:55 [PATCH v1 0/7] Add TDX Guest Support (shared-mm support) Kuppuswamy Sathyanarayanan
2021-06-09 21:55 ` [PATCH v1 1/7] x86/mm: Move force_dma_unencrypted() to common code Kuppuswamy Sathyanarayanan
2021-06-11 14:43 ` Tom Lendacky
2021-06-11 16:00 ` Kuppuswamy, Sathyanarayanan
2021-06-09 21:55 ` [PATCH v1 2/7] x86/tdx: Exclude Shared bit from physical_mask Kuppuswamy Sathyanarayanan
2021-06-09 21:55 ` [PATCH v1 3/7] x86/tdx: Make pages shared in ioremap() Kuppuswamy Sathyanarayanan
2021-06-09 21:55 ` [PATCH v1 4/7] x86/tdx: Add helper to do MapGPA hypercall Kuppuswamy Sathyanarayanan
2021-06-09 21:55 ` [PATCH v1 5/7] x86/tdx: Make DMA pages shared Kuppuswamy Sathyanarayanan
2021-06-09 21:55 ` [PATCH v1 6/7] x86/kvm: Use bounce buffers for TD guest Kuppuswamy Sathyanarayanan
2021-06-11 14:52 ` Tom Lendacky [this message]
2021-06-11 16:03 ` Kuppuswamy, Sathyanarayanan
2021-06-09 21:55 ` [PATCH v1 7/7] x86/tdx: ioapic: Add shared bit for IOAPIC base address Kuppuswamy Sathyanarayanan
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