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([2001:b07:6468:f312:9af8:e5f5:7516:fa89]) by smtp.googlemail.com with ESMTPSA id g7-20020a05600c310700b003fe15ac0934sm1501378wmo.1.2023.09.20.10.54.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 20 Sep 2023 10:54:54 -0700 (PDT) Message-ID: Date: Wed, 20 Sep 2023 19:54:48 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH v10 33/38] x86/entry: Add fred_entry_from_kvm() for VMX to handle IRQ/NMI To: Xin Li , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org, linux-hyperv@vger.kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, luto@kernel.org, seanjc@google.com, peterz@infradead.org, jgross@suse.com, ravi.v.shankar@intel.com, mhiramat@kernel.org, andrew.cooper3@citrix.com, jiangshanlai@gmail.com References: <20230914044805.301390-1-xin3.li@intel.com> <20230914044805.301390-34-xin3.li@intel.com> Content-Language: en-US From: Paolo Bonzini In-Reply-To: <20230914044805.301390-34-xin3.li@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On 9/14/23 06:48, Xin Li wrote: > + /* > + * Don't check the FRED stack level, the call stack leading to this > + * helper is effectively constant and shallow (relatively speaking). It's more that we don't need to protect from reentrancy. The external interrupt uses stack level 0 so no adjustment would be needed anyway, and NMI does not use an IST even in the non-FRED case. > + * Emulate the FRED-defined redzone and stack alignment. > + */ > + sub $(FRED_CONFIG_REDZONE_AMOUNT << 6), %rsp > + and $FRED_STACK_FRAME_RSP_MASK, %rsp