netdev - [PATCH 04/12] Drivers: hv: Explicitly request decrypted in vmap

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Date:   Thu, 20 Oct 2022 10:57:07 -0700
From:   Michael Kelley <mikelley@...rosoft.com>
To:     hpa@...or.com, kys@...rosoft.com, haiyangz@...rosoft.com,
        sthemmin@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
        luto@...nel.org, peterz@...radead.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        lpieralisi@...nel.org, robh@...nel.org, kw@...ux.com,
        bhelgaas@...gle.com, arnd@...db.de, hch@...radead.org,
        m.szyprowski@...sung.com, robin.murphy@....com,
        thomas.lendacky@....com, brijesh.singh@....com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        Tianyu.Lan@...rosoft.com, kirill.shutemov@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, ak@...ux.intel.com,
        isaku.yamahata@...el.com, dan.j.williams@...el.com,
        jane.chu@...cle.com, seanjc@...gle.com, tony.luck@...el.com,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
        iommu@...ts.linux.dev
Cc:     mikelley@...rosoft.com
Subject: [PATCH 04/12] Drivers: hv: Explicitly request decrypted in vmap_pfn() calls

In preparation for a subsequent patch, update vmap_pfn() calls to
explicitly request that the mapping be for decrypted access to
the memory.  There's no change in functionality since the PFNs
passed to vmap_pfn() are above the shared_gpa_boundary, implicitly
producing a decrypted mapping. But explicitly requesting decrypted
allows the code to work before and after a subsequent patch
that will cause vmap_pfn() to mask the PFNs to being below the
shared_gpa_boundary. While another subsesquent patch removes the
vmap_pfn() calls entirely, this temporary tweak avoids the need
for a large patch that makes all the changes at once.

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 arch/x86/hyperv/ivm.c    | 2 +-
 drivers/hv/ring_buffer.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c
index f33c67e..e8be4c2 100644
--- a/arch/x86/hyperv/ivm.c
+++ b/arch/x86/hyperv/ivm.c
@@ -343,7 +343,7 @@ void *hv_map_memory(void *addr, unsigned long size)
 		pfns[i] = vmalloc_to_pfn(addr + i * PAGE_SIZE) +
 			(ms_hyperv.shared_gpa_boundary >> PAGE_SHIFT);
 
-	vaddr = vmap_pfn(pfns, size / PAGE_SIZE, PAGE_KERNEL_IO);
+	vaddr = vmap_pfn(pfns, size / PAGE_SIZE, pgprot_decrypted(PAGE_KERNEL_NOENC));
 	kfree(pfns);
 
 	return vaddr;
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index 59a4aa8..b4a91b1 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -211,7 +211,7 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
 
 		ring_info->ring_buffer = (struct hv_ring_buffer *)
 			vmap_pfn(pfns_wraparound, page_cnt * 2 - 1,
-				 PAGE_KERNEL);
+				 pgprot_decrypted(PAGE_KERNEL_NOENC));
 		kfree(pfns_wraparound);
 
 		if (!ring_info->ring_buffer)
-- 
1.8.3.1