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a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2025042001; t=1745310169; bh=hElDV5Vze4WAsf0tFZEf35YrdP6qWjxDv4JzPANXVNk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KtH0j43nk+Duf810zw1CEZbj53zexfsA4TSV0B76pxE9B3Sj1oCxiID+KXn1gmORq vu21eQ4c+tmMchOpXFtsfl+poNPSuVCMyQEoTucNuKqh68DeJWNwQYHG2wEEn23sg+ 1dLcK1ohYsx8lYF42FO6EUtkBUGnHmF1DeuOngZIDHY1MY+76NmeADYp9e+nBhq8bn Ehm+TadXMIp/OyRm+L7atsclg5gNJjCVXv+kLzElC+F0KilwKtEZ9UNRRrcN6CG/Lv Xdp6B4Pk8wYadmONeIh3mea2pnQKdrfmQDXjlUn7TWOlTGJbb5C8vw+ahCl0mRZQEL y0QzP7N4WO1Mw== From: "Xin Li (Intel)" To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, linux-pm@vger.kernel.org, linux-edac@vger.kernel.org, xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org, linux-hwmon@vger.kernel.org, netdev@vger.kernel.org, platform-driver-x86@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, acme@kernel.org, jgross@suse.com, andrew.cooper3@citrix.com, peterz@infradead.org, namhyung@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, kan.liang@linux.intel.com, wei.liu@kernel.org, ajay.kaher@broadcom.com, bcm-kernel-feedback-list@broadcom.com, tony.luck@intel.com, pbonzini@redhat.com, vkuznets@redhat.com, seanjc@google.com, luto@kernel.org, boris.ostrovsky@oracle.com, kys@microsoft.com, haiyangz@microsoft.com, decui@microsoft.com Subject: [RFC PATCH v2 13/34] x86/xen/msr: Remove the error pointer argument from set_reg() Date: Tue, 22 Apr 2025 01:21:54 -0700 Message-ID: <20250422082216.1954310-14-xin@zytor.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250422082216.1954310-1-xin@zytor.com> References: <20250422082216.1954310-1-xin@zytor.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @zytor.com) X-ZM-MESSAGEID: 1745310232287019100 Content-Type: text/plain; charset="utf-8" set_reg() is used to write the following MSRs on Xen: MSR_FS_BASE MSR_KERNEL_GS_BASE MSR_GS_BASE But none of these MSRs are written using any MSR write safe API. Therefore there is no need to pass an error pointer argument to set_reg() for returning an error code to be used in MSR safe APIs. Remove the error pointer argument. Signed-off-by: Xin Li (Intel) Reviewed-by: Juergen Gross --- arch/x86/xen/enlighten_pv.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index b5a8bceb5f56..9a89cb29fa35 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -1111,17 +1111,11 @@ static u64 xen_do_read_msr(unsigned int msr, int *e= rr) return val; } =20 -static void set_seg(unsigned int which, unsigned int low, unsigned int hig= h, - int *err) +static void set_seg(u32 which, u32 low, u32 high) { u64 base =3D ((u64)high << 32) | low; =20 - if (HYPERVISOR_set_segment_base(which, base) =3D=3D 0) - return; - - if (err) - *err =3D -EIO; - else + if (HYPERVISOR_set_segment_base(which, base)) WARN(1, "Xen set_segment_base(%u, %llx) failed\n", which, base); } =20 @@ -1138,15 +1132,15 @@ static void xen_do_write_msr(unsigned int msr, unsi= gned int low, =20 switch (msr) { case MSR_FS_BASE: - set_seg(SEGBASE_FS, low, high, err); + set_seg(SEGBASE_FS, low, high); break; =20 case MSR_KERNEL_GS_BASE: - set_seg(SEGBASE_GS_USER, low, high, err); + set_seg(SEGBASE_GS_USER, low, high); break; =20 case MSR_GS_BASE: - set_seg(SEGBASE_GS_KERNEL, low, high, err); + set_seg(SEGBASE_GS_KERNEL, low, high); break; =20 case MSR_STAR: --=20 2.49.0