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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>
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: [PATCH v4 01/10] x86/io: Allow to override inX() and outX() implementation
Date: Wed,  4 Aug 2021 12:18:46 -0700	[thread overview]
Message-ID: <20210804191855.2901927-2-sathyanarayanan.kuppuswamy@linux.intel.com> (raw)
In-Reply-To: <20210804191855.2901927-1-sathyanarayanan.kuppuswamy@linux.intel.com>

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

The patch allows to override the implementation of the port IO
helpers. TDX code will provide an implementation that redirect the
helpers to paravirt calls.

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 v2:
 * None

 arch/x86/include/asm/io.h | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 841a5d104afa..be96bf1e667a 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -271,18 +271,26 @@ static inline bool sev_key_active(void) { return false; }
 
 #endif /* CONFIG_AMD_MEM_ENCRYPT */
 
+#ifndef __out
+#define __out(bwl, bw)							\
+	asm volatile("out" #bwl " %" #bw "0, %w1" : : "a"(value), "Nd"(port))
+#endif
+
+#ifndef __in
+#define __in(bwl, bw)							\
+	asm volatile("in" #bwl " %w1, %" #bw "0" : "=a"(value) : "Nd"(port))
+#endif
+
 #define BUILDIO(bwl, bw, type)						\
 static inline void out##bwl(unsigned type value, int port)		\
 {									\
-	asm volatile("out" #bwl " %" #bw "0, %w1"			\
-		     : : "a"(value), "Nd"(port));			\
+	__out(bwl, bw);							\
 }									\
 									\
 static inline unsigned type in##bwl(int port)				\
 {									\
 	unsigned type value;						\
-	asm volatile("in" #bwl " %w1, %" #bw "0"			\
-		     : "=a"(value) : "Nd"(port));			\
+	__in(bwl, bw);							\
 	return value;							\
 }									\
 									\
-- 
2.25.1


  reply	other threads:[~2021-08-04 19:19 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04 19:18 [PATCH v4 00/10] Add TDX Guest Support (#VE handler support) Kuppuswamy Sathyanarayanan
2021-08-04 19:18 ` Kuppuswamy Sathyanarayanan [this message]
2021-08-04 19:18 ` [PATCH v4 02/10] x86/tdx: Add early_is_tdx_guest() interface Kuppuswamy Sathyanarayanan
2021-08-04 19:18 ` [PATCH v4 03/10] x86/tdx: Handle port I/O in decompression code Kuppuswamy Sathyanarayanan
2021-08-04 19:18 ` [PATCH v4 04/10] x86/tdx: Handle early IO operations Kuppuswamy Sathyanarayanan
2021-08-04 19:18 ` [PATCH v4 05/10] x86/tdx: Handle port I/O Kuppuswamy Sathyanarayanan
2021-08-04 19:18 ` [PATCH v4 06/10] x86/insn-eval: Introduce insn_get_modrm_reg_ptr() Kuppuswamy Sathyanarayanan
2021-08-04 19:18 ` [PATCH v4 07/10] x86/insn-eval: Introduce insn_decode_mmio() Kuppuswamy Sathyanarayanan
2021-08-04 19:18 ` [PATCH v4 08/10] x86/sev-es: Use insn_decode_mmio() for MMIO implementation Kuppuswamy Sathyanarayanan
2021-08-04 19:18 ` [PATCH v4 09/10] x86/tdx: Handle in-kernel MMIO Kuppuswamy Sathyanarayanan
2021-08-04 19:18 ` [PATCH v4 10/10] x86/tdx: Handle MWAIT and MONITOR Kuppuswamy Sathyanarayanan

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