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Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" Subject: [PATCH 3/3] x86/hyperv: Remove ASM_CALL_CONSTRAINT with VMMCALL insn Date: Thu, 20 Nov 2025 14:40:24 +0100 Message-ID: <20251120134105.189753-3-ubizjak@gmail.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251120134105.189753-1-ubizjak@gmail.com> References: <20251120134105.189753-1-ubizjak@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Unlike CALL instruction, VMMCALL does not push to the stack, and may be inserted before the frame pointer gets set up by the containing function. Signed-off-by: Uros Bizjak Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Wei Liu Cc: Dexuan Cui Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" --- arch/x86/hyperv/ivm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index 7365d8f43181..be7fad43a88d 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -392,7 +392,7 @@ u64 hv_snp_hypercall(u64 control, u64 param1, u64 param2) register u64 __r8 asm("r8") = param2; asm volatile("vmmcall" - : "=a" (hv_status), ASM_CALL_CONSTRAINT, + : "=a" (hv_status), "+c" (control), "+d" (param1), "+r" (__r8) : : "cc", "memory", "r9", "r10", "r11"); -- 2.51.1