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Y. Srinivasan" , Haiyang Zhang , Dexuan Cui , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" Subject: [PATCH v2 2/3] x86/hyperv: Use savesegment() instead of inline asm() to save segment registers Date: Fri, 21 Nov 2025 15:14:10 +0100 Message-ID: <20251121141437.205481-2-ubizjak@gmail.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251121141437.205481-1-ubizjak@gmail.com> References: <20251121141437.205481-1-ubizjak@gmail.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Use standard savesegment() utility macro to save segment registers. Signed-off-by: Uros Bizjak Acked-by: Wei Liu Tested-by: Michael Kelley Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Dexuan Cui Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" --- arch/x86/hyperv/ivm.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index 651771534cae..7365d8f43181 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #ifdef CONFIG_AMD_MEM_ENCRYPT @@ -315,16 +316,16 @@ int hv_snp_boot_ap(u32 apic_id, unsigned long start_ip, unsigned int cpu) vmsa->gdtr.base = gdtr.address; vmsa->gdtr.limit = gdtr.size; - asm volatile("movl %%es, %%eax;" : "=a" (vmsa->es.selector)); + savesegment(es, vmsa->es.selector); hv_populate_vmcb_seg(vmsa->es, vmsa->gdtr.base); - asm volatile("movl %%cs, %%eax;" : "=a" (vmsa->cs.selector)); + savesegment(cs, vmsa->cs.selector); hv_populate_vmcb_seg(vmsa->cs, vmsa->gdtr.base); - asm volatile("movl %%ss, %%eax;" : "=a" (vmsa->ss.selector)); + savesegment(ss, vmsa->ss.selector); hv_populate_vmcb_seg(vmsa->ss, vmsa->gdtr.base); - asm volatile("movl %%ds, %%eax;" : "=a" (vmsa->ds.selector)); + savesegment(ds, vmsa->ds.selector); hv_populate_vmcb_seg(vmsa->ds, vmsa->gdtr.base); vmsa->efer = native_read_msr(MSR_EFER); -- 2.51.1