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Thu, 18 Dec 2025 08:33:02 -0800 (PST) Message-ID: Date: Thu, 18 Dec 2025 17:33:00 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [XEN][PATCH v2 0/4] x86: pvh: allow to disable 32-bit (COMPAT) interface support To: Grygorii Strashko , Andrew Cooper Cc: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= , Anthony PERARD , Michal Orzel , Julien Grall , Stefano Stabellini , "xen-devel@lists.xenproject.org" References: <20251119192916.1009549-1-grygorii_strashko@epam.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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 18.12.2025 17:20, Grygorii Strashko wrote: > I'm planning to send v3 - so would be appreciated for any other comments. Andrew, could you please write down the outline of what you described verbally the other day, to scope the extent to which we may want to take changes here? Thanks, Jan > On 19.11.25 21:30, Grygorii Strashko wrote: >> From: Grygorii Strashko >> >> Hi >> >> This series introduces possibility to disable 32-bit (COMPAT) interface support >> in the following case: >> - Only PVH domains are used >> - Guests (OS) are started by using direct Direct Kernel Boot >> - Guests (OS) are 64-bit and Guest early boot code, which is running not >> in 64-bit mode, does not access Xen interfaces >> (hypercalls, shared_info, ..) >> >> If above criterias are met the COMPAT HVM interface become unreachable and can be disabled. >> Coverage reports analyze and adding guard (debug) exceptions in hvm_hypercall/hvm_do_multicall_call >> and hvm_latch_shinfo_size() confirm that COMPAT HVM interface is unused for safety use-case. >> >> Changes in v2 described in each patch: >> - patch "x86: constify has_32bit_shinfo() if !CONFIG_COMPAT" squashed in patch 2. >> >> v1: >> https://patchwork.kernel.org/project/xen-devel/cover/20251111175413.3540690-1-grygorii_strashko@epam.com/ >> >> Grygorii Strashko (4): >> x86: hvm: dm: factor out compat code under ifdefs >> x86: hvm: compat: introduce is_hcall_compat() helper >> x86: hvm: factor out COMPAT code under ifdefs >> x86: pvh: allow to disable 32-bit interface support >> >> xen/arch/x86/hvm/Kconfig | 19 ++++++++++++++++++- >> xen/arch/x86/hvm/dm.c | 2 ++ >> xen/arch/x86/hvm/hvm.c | 24 ++++++++++++++++++++---- >> xen/arch/x86/hvm/hypercall.c | 22 +++++++++++++++++----- >> xen/arch/x86/hypercall.c | 6 +----- >> xen/arch/x86/include/asm/domain.h | 9 +++++++-- >> xen/common/kernel.c | 2 +- >> xen/include/hypercall-defs.c | 9 +++++++-- >> xen/include/xen/sched.h | 9 +++++++++ >> 9 files changed, 82 insertions(+), 20 deletions(-) >> >