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[37.24.206.209]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47fec23ede6sm7230911f8f.30.2026.08.05.02.04.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 05 Aug 2026 02:04:13 -0700 (PDT) Message-ID: Date: Wed, 5 Aug 2026 11:04:12 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/4] x86/xen: Drop CONFIG_XEN_PVHVM_SMP To: Juergen Gross Cc: Boris Ostrovsky , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, x86@kernel.org References: <20260805082137.1214967-1-jgross@suse.com> <20260805082137.1214967-5-jgross@suse.com> <5febc2c0-4355-48d9-9342-52d590041500@suse.com> Content-Language: en-US From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <5febc2c0-4355-48d9-9342-52d590041500@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 05.08.2026 10:55, Juergen Gross wrote: > On 05.08.26 10:44, Jan Beulich wrote: >> On 05.08.2026 10:21, Juergen Gross wrote: >>> --- a/arch/x86/xen/Makefile >>> +++ b/arch/x86/xen/Makefile >>> @@ -37,8 +37,8 @@ obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o >>> obj-$(CONFIG_EVENT_TRACING) += trace.o >>> >>> obj-$(CONFIG_SMP) += smp.o >>> +obj-$(CONFIG_SMP) += smp_hvm.o >>> obj-$(CONFIG_XEN_PV_SMP) += smp_pv.o >>> -obj-$(CONFIG_XEN_PVHVM_SMP) += smp_hvm.o >> >> Similar issue here - in a PV-only config smp_hvm.o doesn't want / shouldn't >> need building. > > Note that I didn't change any functionality. > > I agree that it seems a little bit strange, but in the end I believe > the current status is okay-ish. PV-only hasn't been something in upstream > Linux since Xen support was added, as PV was always meant to be an > alternative to bare metal support via paravirt patching. It might have > been possible to build a kernel not really functional on bare metal, but > this was more like the ability to build a x86 kernel not working on any > existing machine. > > IMO the Xen kernel config options should allow for adding Xen-specific > features, but minimum Xen support should always have basic HVM support, > which includes the Xen specific performance enhancements. I fear I don't understand this. If I want a kernel just to run as PV Dom0, why would it need to carry anything HVM-ish? That is (or should be) entirely unrelated to being able to also run this same kernel on baremetal then. Jan