From: Dexuan Cui <decui@microsoft.com>
To: 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-arch@vger.kernel.org, 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, x86@kernel.org, mikelley@microsoft.com
Cc: linux-kernel@vger.kernel.org, Tianyu.Lan@microsoft.com,
rick.p.edgecombe@intel.com, Dexuan Cui <decui@microsoft.com>
Subject: [PATCH v8 2/2] x86/tdx: Support vmalloc() for tdx_enc_status_changed()
Date: Tue, 20 Jun 2023 08:48:30 -0700 [thread overview]
Message-ID: <20230620154830.25442-3-decui@microsoft.com> (raw)
In-Reply-To: <20230620154830.25442-1-decui@microsoft.com>
When a TDX guest runs on Hyper-V, the hv_netvsc driver's netvsc_init_buf()
allocates buffers using vzalloc(), and needs to share the buffers with the
host OS by calling set_memory_decrypted(), which is not working for
vmalloc() yet. Add the support by handling the pages one by one.
Co-developed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
---
arch/x86/coco/tdx/tdx.c | 35 +++++++++++++++++++++++++++++------
1 file changed, 29 insertions(+), 6 deletions(-)
Changes in v2:
Changed tdx_enc_status_changed() in place.
Changes in v3:
No change since v2.
Changes in v4:
Added Kirill's Co-developed-by since Kirill helped to improve the
code by adding tdx_enc_status_changed_phys().
Thanks Kirill for the clarification on load_unaligned_zeropad()!
Changes in v5:
Added Kirill's Signed-off-by.
Added Michael's Reviewed-by.
Changes in v6: None.
Changes in v7: None.
Note: there was a race between set_memory_encrypted() and
load_unaligned_zeropad(), which has been fixed by the 3 patches of
Kirill in the x86/tdx branch of the tip tree.
Changes in v8:
Rebased to tip.git's master branch.
diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index 0c198ab73aa7..a313d5ab42f1 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -8,6 +8,7 @@
#include <linux/export.h>
#include <linux/io.h>
+#include <linux/mm.h>
#include <asm/coco.h>
#include <asm/tdx.h>
#include <asm/vmx.h>
#include <asm/insn.h>
@@ -752,6 +753,19 @@ static bool tdx_map_gpa(phys_addr_t start, phys_addr_t end, bool enc)
return false;
}
+static bool tdx_enc_status_changed_phys(phys_addr_t start, phys_addr_t end,
+ bool enc)
+{
+ if (!tdx_map_gpa(start, end, enc))
+ return false;
+
+ /* shared->private conversion requires memory to be accepted before use */
+ if (enc)
+ return tdx_accept_memory(start, end);
+
+ return true;
+}
+
/*
* Inform the VMM of the guest's intent for this physical page: shared with
* the VMM or private to the guest. The VMM is expected to change its mapping
@@ -759,15 +773,24 @@ static bool tdx_map_gpa(phys_addr_t start, phys_addr_t end, bool enc)
*/
static bool tdx_enc_status_changed(unsigned long vaddr, int numpages, bool enc)
{
- phys_addr_t start = __pa(vaddr);
- phys_addr_t end = __pa(vaddr + numpages * PAGE_SIZE);
+ unsigned long start = vaddr;
+ unsigned long end = start + numpages * PAGE_SIZE;
- if (!tdx_map_gpa(start, end, enc))
+ if (offset_in_page(start) != 0)
return false;
- /* shared->private conversion requires memory to be accepted before use */
- if (enc)
- return tdx_accept_memory(start, end);
+ if (!is_vmalloc_addr((void *)start))
+ return tdx_enc_status_changed_phys(__pa(start), __pa(end), enc);
+
+ while (start < end) {
+ phys_addr_t start_pa = slow_virt_to_phys((void *)start);
+ phys_addr_t end_pa = start_pa + PAGE_SIZE;
+
+ if (!tdx_enc_status_changed_phys(start_pa, end_pa, enc))
+ return false;
+
+ start += PAGE_SIZE;
+ }
return true;
}
--
2.25.1
next prev parent reply other threads:[~2023-06-20 15:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-20 15:48 [PATCH v8 0/2] Support TDX guests on Hyper-V (the x86/tdx part) Dexuan Cui
2023-06-20 15:48 ` [PATCH v8 1/2] x86/tdx: Retry TDVMCALL_MAP_GPA() when needed Dexuan Cui
2023-06-20 18:30 ` Sathyanarayanan Kuppuswamy
2023-06-20 19:23 ` Dexuan Cui
2023-06-20 19:44 ` Sathyanarayanan Kuppuswamy
2023-06-20 23:34 ` Dave Hansen
2023-06-21 0:28 ` Dexuan Cui
2023-06-20 15:48 ` Dexuan Cui [this message]
2023-06-20 18:34 ` [PATCH v8 2/2] x86/tdx: Support vmalloc() for tdx_enc_status_changed() Sathyanarayanan Kuppuswamy
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