From patchwork Sat Nov 23 18:20:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Daniel P. 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Smith" To: xen-devel@lists.xenproject.org Cc: "Daniel P. Smith" , jason.andryuk@amd.com, christopher.w.clark@gmail.com, stefano.stabellini@amd.com, Jan Beulich , Andrew Cooper , =?utf-8?q?Roger_Pau_Monn=C3=A9?= Subject: [PATCH 14/15] x86/hyperlaunch: add max vcpu parsing of hyperlaunch device tree Date: Sat, 23 Nov 2024 13:20:43 -0500 Message-Id: <20241123182044.30687-15-dpsmith@apertussolutions.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20241123182044.30687-1-dpsmith@apertussolutions.com> References: <20241123182044.30687-1-dpsmith@apertussolutions.com> MIME-Version: 1.0 X-ZohoMailClient: External Introduce the `cpus` property, named as such for dom0less compatibility, that represents the maximum number of vpcus to allocate for a domain. In the device tree, it will be encoded as a u32 value. Signed-off-by: Daniel P. Smith --- xen/arch/x86/dom0_build.c | 3 +++ xen/arch/x86/domain_builder/fdt.c | 12 ++++++++++++ xen/arch/x86/include/asm/bootdomain.h | 2 ++ 3 files changed, 17 insertions(+) diff --git a/xen/arch/x86/dom0_build.c b/xen/arch/x86/dom0_build.c index 1c3b7ff0e658..7ff052016bfd 100644 --- a/xen/arch/x86/dom0_build.c +++ b/xen/arch/x86/dom0_build.c @@ -617,6 +617,9 @@ int __init construct_dom0(struct boot_domain *bd) if ( !get_memsize(&dom0_max_size, LONG_MAX) && bd->max_pages ) dom0_size.nr_pages = bd->max_pages; + if ( opt_dom0_max_vcpus_max == UINT_MAX && bd->max_vcpus ) + opt_dom0_max_vcpus_max = bd->max_vcpus; + if ( is_hvm_domain(d) ) rc = dom0_construct_pvh(bd); else if ( is_pv_domain(d) ) diff --git a/xen/arch/x86/domain_builder/fdt.c b/xen/arch/x86/domain_builder/fdt.c index b8ace5c18c6a..d24e265f2378 100644 --- a/xen/arch/x86/domain_builder/fdt.c +++ b/xen/arch/x86/domain_builder/fdt.c @@ -197,6 +197,18 @@ static int __init process_domain_node( bd->max_pages = PFN_DOWN(kb * SZ_1K); printk(" max memory: %ld\n", bd->max_pages << PAGE_SHIFT); } + if ( match_fdt_property(fdt, prop, "cpus" ) ) + { + uint32_t val = UINT_MAX; + if ( fdt_prop_as_u32(prop, &val) != 0 ) + { + printk(" failed processing max_vcpus for domain %s\n", + name == NULL ? "unknown" : name); + return -EINVAL; + } + bd->max_vcpus = val; + printk(" max vcpus: %d\n", bd->max_vcpus); + } } fdt_for_each_subnode(node, fdt, dom_node) diff --git a/xen/arch/x86/include/asm/bootdomain.h b/xen/arch/x86/include/asm/bootdomain.h index 9a5ba2931665..d144d6173400 100644 --- a/xen/arch/x86/include/asm/bootdomain.h +++ b/xen/arch/x86/include/asm/bootdomain.h @@ -28,6 +28,8 @@ struct boot_domain { unsigned long min_pages; unsigned long max_pages; + unsigned int max_vcpus; + struct boot_module *kernel; struct boot_module *ramdisk;