linux-kernel - [PATCH 1/1] tools headers UAPI: Sync KVM's vmx.h header with the kernel sources to handle new exit reasons

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Message-ID: <aQjYUNV37bAvFNks@x1>
Date: Mon, 3 Nov 2025 13:29:04 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Sean Christopherson <seanjc@...gle.com>, Xin Li <xin@...or.com>,
	Isaku Yamahata <isaku.yamahata@...el.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Ian Rogers <irogers@...gle.com>,
	James Clark <james.clark@...aro.org>, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH 1/1] tools headers UAPI: Sync KVM's vmx.h header with the
 kernel sources to handle new exit reasons

tldr; Just FYI, I'm carrying this on the perf tools tree.

Full explanation:

There used to be no copies, with tools/ code using kernel headers
directly. From time to time tools/perf/ broke due to legitimate kernel
hacking. At some point Linus complained about such direct usage. Then we
adopted the current model.

See further details at:

 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/include/uapi/README

To pick the changes in:

  885df2d2109a60f8 ("KVM: x86: Add support for RDMSR/WRMSRNS w/ immediate on Intel")
  c42856af8f70d983 ("KVM: TDX: Add a place holder for handler of TDX hypercalls (TDG.VP.VMCALL)")

That makes 'perf kvm-stat' aware of these new TDCALL and
MSR_{READ,WRITE}_IMM exit reasons, thus addressing the following perf
build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/arch/x86/include/uapi/asm/vmx.h arch/x86/include/uapi/asm/vmx.h

Please see tools/include/uapi/README for further details.

Cc: Sean Christopherson <seanjc@...gle.com>
Cc: Xin Li <xin@...or.com>
Cc: Isaku Yamahata <isaku.yamahata@...el.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/arch/x86/include/uapi/asm/vmx.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/arch/x86/include/uapi/asm/vmx.h b/tools/arch/x86/include/uapi/asm/vmx.h
index f0f4a4cf84a7244e..9792e329343e8715 100644
--- a/tools/arch/x86/include/uapi/asm/vmx.h
+++ b/tools/arch/x86/include/uapi/asm/vmx.h
@@ -94,6 +94,8 @@
 #define EXIT_REASON_BUS_LOCK            74
 #define EXIT_REASON_NOTIFY              75
 #define EXIT_REASON_TDCALL              77
+#define EXIT_REASON_MSR_READ_IMM        84
+#define EXIT_REASON_MSR_WRITE_IMM       85
 
 #define VMX_EXIT_REASONS \
 	{ EXIT_REASON_EXCEPTION_NMI,         "EXCEPTION_NMI" }, \
@@ -158,7 +160,9 @@
 	{ EXIT_REASON_TPAUSE,                "TPAUSE" }, \
 	{ EXIT_REASON_BUS_LOCK,              "BUS_LOCK" }, \
 	{ EXIT_REASON_NOTIFY,                "NOTIFY" }, \
-	{ EXIT_REASON_TDCALL,                "TDCALL" }
+	{ EXIT_REASON_TDCALL,                "TDCALL" }, \
+	{ EXIT_REASON_MSR_READ_IMM,          "MSR_READ_IMM" }, \
+	{ EXIT_REASON_MSR_WRITE_IMM,         "MSR_WRITE_IMM" }
 
 #define VMX_EXIT_REASON_FLAGS \
 	{ VMX_EXIT_REASONS_FAILED_VMENTRY,	"FAILED_VMENTRY" }
-- 
2.51.1