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From: Kuppuswamy Sathyanarayanan  <sathyanarayanan.kuppuswamy@linux.intel.com>
To: 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>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Richard Henderson <rth@twiddle.net>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	James E J Bottomley <James.Bottomley@HansenPartnership.com>,
	Helge Deller <deller@gmx.de>,
	"David S . Miller" <davem@davemloft.net>,
	Arnd Bergmann <arnd@arndb.de>, Jonathan Corbet <corbet@lwn.net>,
	"Michael S . Tsirkin" <mst@redhat.com>
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,
	linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org,
	linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
	sparclinux@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-doc@vger.kernel.org,
	virtualization@lists.linux-foundation.org
Subject: [PATCH v4 04/15] x86/tdx: Add helper to do MapGPA hypercall
Date: Wed,  4 Aug 2021 17:52:07 -0700	[thread overview]
Message-ID: <20210805005218.2912076-5-sathyanarayanan.kuppuswamy@linux.intel.com> (raw)
In-Reply-To: <20210805005218.2912076-1-sathyanarayanan.kuppuswamy@linux.intel.com>

From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

MapGPA hypercall is used by TDX guests to request VMM convert
the existing mapping of given GPA address range between
private/shared.

tdx_hcall_gpa_intent() is the wrapper used for making MapGPA
hypercall.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---

Changes since v3:
 * None

Changes since v1:
 * Modified tdx_hcall_gpa_intent() to use _tdx_hypercall() instead of
   tdx_hypercall().

 arch/x86/include/asm/tdx.h | 18 ++++++++++++++++++
 arch/x86/kernel/tdx.c      | 25 +++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index 1e2a1c6a1898..665c8cf57d5b 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -56,6 +56,15 @@ struct ve_info {
 	u32 instr_info;
 };
 
+/*
+ * Page mapping type enum. This is software construct not
+ * part of any hardware or VMM ABI.
+ */
+enum tdx_map_type {
+	TDX_MAP_PRIVATE,
+	TDX_MAP_SHARED,
+};
+
 #ifdef CONFIG_INTEL_TDX_GUEST
 
 void __init tdx_early_init(void);
@@ -79,6 +88,9 @@ bool tdg_early_handle_ve(struct pt_regs *regs);
 
 extern phys_addr_t tdg_shared_mask(void);
 
+extern int tdx_hcall_gpa_intent(phys_addr_t gpa, int numpages,
+				enum tdx_map_type map_type);
+
 /*
  * To support I/O port access in decompressor or early kernel init
  * code, since #VE exception handler cannot be used, use paravirt
@@ -149,6 +161,12 @@ static inline bool tdg_early_handle_ve(struct pt_regs *regs) { return false; }
 
 static inline phys_addr_t tdg_shared_mask(void) { return 0; }
 
+static inline int tdx_hcall_gpa_intent(phys_addr_t gpa, int numpages,
+				       enum tdx_map_type map_type)
+{
+	return -ENODEV;
+}
+
 #endif /* CONFIG_INTEL_TDX_GUEST */
 
 #ifdef CONFIG_INTEL_TDX_GUEST_KVM
diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c
index d316fe33f52f..ccbad600a422 100644
--- a/arch/x86/kernel/tdx.c
+++ b/arch/x86/kernel/tdx.c
@@ -18,6 +18,9 @@
 #define TDINFO				1
 #define TDGETVEINFO			3
 
+/* TDX hypercall Leaf IDs */
+#define TDVMCALL_MAP_GPA		0x10001
+
 #define VE_IS_IO_OUT(exit_qual)		(((exit_qual) & 8) ? 0 : 1)
 #define VE_GET_IO_SIZE(exit_qual)	(((exit_qual) & 7) + 1)
 #define VE_GET_PORT_NUM(exit_qual)	((exit_qual) >> 16)
@@ -97,6 +100,28 @@ static void tdg_get_info(void)
 	physical_mask &= ~tdg_shared_mask();
 }
 
+/*
+ * 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 of the page in response.
+ *
+ * Note: shared->private conversions require further guest
+ * action to accept the page.
+ */
+int tdx_hcall_gpa_intent(phys_addr_t gpa, int numpages,
+			 enum tdx_map_type map_type)
+{
+	u64 ret;
+
+	if (map_type == TDX_MAP_SHARED)
+		gpa |= tdg_shared_mask();
+
+	ret = _tdx_hypercall(TDVMCALL_MAP_GPA, gpa, PAGE_SIZE * numpages, 0, 0,
+			     NULL);
+
+	return ret ? -EIO : 0;
+}
+
 static __cpuidle void tdg_halt(void)
 {
 	u64 ret;
-- 
2.25.1


  parent reply	other threads:[~2021-08-05  0:53 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-05  0:52 [PATCH v4 00/15] Add TDX Guest Support (shared-mm support) Kuppuswamy Sathyanarayanan
2021-08-05  0:52 ` [PATCH v4 01/15] x86/mm: Move force_dma_unencrypted() to common code Kuppuswamy Sathyanarayanan
2021-08-05  0:52 ` [PATCH v4 02/15] x86/tdx: Exclude Shared bit from physical_mask Kuppuswamy Sathyanarayanan
2021-08-05  0:52 ` [PATCH v4 03/15] x86/tdx: Make pages shared in ioremap() Kuppuswamy Sathyanarayanan
2021-08-05  0:52 ` Kuppuswamy Sathyanarayanan [this message]
2021-08-05  0:52 ` [PATCH v4 05/15] x86/tdx: Make DMA pages shared Kuppuswamy Sathyanarayanan
2021-08-05  0:52 ` [PATCH v4 06/15] x86/kvm: Use bounce buffers for TD guest Kuppuswamy Sathyanarayanan
2021-08-05  0:52 ` [PATCH v4 07/15] x86/tdx: ioapic: Add shared bit for IOAPIC base address Kuppuswamy Sathyanarayanan
2021-08-05  0:52 ` [PATCH v4 08/15] x86/tdx: Enable shared memory protected guest flags for TDX guest Kuppuswamy Sathyanarayanan
2021-08-05  0:52 ` [PATCH v4 09/15] pci: Consolidate pci_iomap* and pci_iomap*wc Kuppuswamy Sathyanarayanan
2021-08-12 19:43   ` Bjorn Helgaas
2021-08-12 22:11     ` Andi Kleen
2021-08-12 22:29     ` Kuppuswamy, Sathyanarayanan
2021-08-05  0:52 ` [PATCH v4 10/15] asm/io.h: Add ioremap_shared fallback Kuppuswamy Sathyanarayanan
2021-08-12 19:46   ` Bjorn Helgaas
2021-08-13  7:58   ` Christoph Hellwig
2021-08-05  0:52 ` [PATCH v4 11/15] pci: Add pci_iomap_shared{,_range} Kuppuswamy Sathyanarayanan
2021-08-13  8:02   ` Christoph Hellwig
2021-08-23 23:56   ` Michael S. Tsirkin
2021-08-24  0:30     ` Kuppuswamy, Sathyanarayanan
2021-08-24  1:04       ` Dan Williams
2021-08-24  2:14         ` Andi Kleen
2021-08-24  9:47           ` Michael S. Tsirkin
2021-08-24 17:20             ` Andi Kleen
2021-08-24 18:55               ` Bjorn Helgaas
2021-08-24 20:14                 ` Andi Kleen
2021-08-24 20:31                   ` Bjorn Helgaas
2021-08-24 20:50                     ` Andi Kleen
2021-08-24 21:05                       ` Dan Williams
2021-08-25 14:52                       ` Bjorn Helgaas
2021-08-24 21:55                 ` Rajat Jain
2021-08-29 15:27               ` Michael S. Tsirkin
2021-08-29 16:17                 ` Andi Kleen
2021-08-29 22:26                   ` Michael S. Tsirkin
2021-08-30  5:11                     ` Andi Kleen
2021-08-30 20:59                       ` Michael S. Tsirkin
2021-08-31  0:23                         ` Andi Kleen
2021-09-10  9:54                           ` Michael S. Tsirkin
2021-09-10 16:34                             ` Andi Kleen
2021-09-11 23:54                               ` Michael S. Tsirkin
2021-09-13  5:53                                 ` Michael S. Tsirkin
2021-09-24 22:43                                 ` Andi Kleen
2021-09-27  9:07                                   ` Michael S. Tsirkin
2021-08-24 21:56         ` Rajat Jain
2021-08-24 21:59           ` Dan Williams
2021-08-24  7:07       ` Christoph Hellwig
2021-08-24 17:04         ` Andi Kleen
2021-08-29 15:34           ` Michael S. Tsirkin
2021-08-29 16:43             ` Andi Kleen
2021-08-24  9:12       ` Michael S. Tsirkin
2021-08-05  0:52 ` [PATCH v4 12/15] pci: Mark MSI data shared Kuppuswamy Sathyanarayanan
2021-08-13  8:07   ` Christoph Hellwig
2021-08-05  0:52 ` [PATCH v4 13/15] virtio: Use shared mappings for virtio PCI devices Kuppuswamy Sathyanarayanan
2021-08-05  0:52 ` [PATCH v4 14/15] x86/tdx: Implement ioremap_shared for x86 Kuppuswamy Sathyanarayanan
2021-08-05  0:52 ` [PATCH v4 15/15] x86/tdx: Add cmdline option to force use of ioremap_shared Kuppuswamy Sathyanarayanan

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