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([192.19.161.250]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2be4f80cc1dsm2237336eec.3.2026.03.06.17.06.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Mar 2026 17:06:50 -0800 (PST) From: Alexey Makhalov To: x86@kernel.org, virtualization@lists.linux.dev, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, mingo@redhat.com, tglx@linutronix.de Cc: ajay.kaher@broadcom.com, brennan.lamoreaux@broadcom.com, bo.gan@broadcom.com, bcm-kernel-feedback-list@broadcom.com, linux-kernel@vger.kernel.org, kas@kernel.org, rick.p.edgecombe@intel.com, linux-coco@lists.linux.dev, Alexey Makhalov Subject: [PATCH 4/4] x86/vmware: Support steal time clock for encrypted guests Date: Sat, 7 Mar 2026 00:42:38 +0000 Message-ID: <20260307004238.1181299-5-alexey.makhalov@broadcom.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20260307004238.1181299-1-alexey.makhalov@broadcom.com> References: <20260307004238.1181299-1-alexey.makhalov@broadcom.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e Content-Type: text/plain; charset="utf-8" Shared memory containing steal time counter should be set to decrypted when guest memory is encrypted. Co-developed-by: Bo Gan Signed-off-by: Bo Gan Signed-off-by: Alexey Makhalov --- arch/x86/kernel/cpu/vmware.c | 41 ++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c index 8997295a5a5c..e33400d4f2c1 100644 --- a/arch/x86/kernel/cpu/vmware.c +++ b/arch/x86/kernel/cpu/vmware.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include #include @@ -39,6 +40,7 @@ #include #include #include +#include =20 #undef pr_fmt #define pr_fmt(fmt) "vmware: " fmt @@ -379,9 +381,47 @@ static struct notifier_block vmware_pv_reboot_nb =3D { .notifier_call =3D vmware_pv_reboot_notify, }; =20 +/* + * Map per-CPU variables for all possible CPUs as decrypted. + * Do this early in boot, before sharing the corresponding + * guest physical addresses with the hypervisor. + */ +static void __init set_shared_memory_decrypted(void) +{ + int cpu; + + if (!cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) + return; + + for_each_possible_cpu(cpu) { + unsigned long size =3D sizeof(vmw_steal_time); + unsigned long addr =3D (unsigned long)&per_cpu(vmw_steal_time, + cpu); + + /* + * There is no generic high-level API to mark memory as + * decrypted. Intel's set_memory_decrypted() depends on the + * buddy allocator and can fail early in boot if a page split + * is required and allocation is not possible. Use AMD's + * early_set_memory_decrypted() instead, which can perform + * the split during early boot. + */ + early_set_memory_decrypted(addr, size); + + /* That's it for AMD */ + if (cc_vendor =3D=3D CC_VENDOR_AMD) + continue; + + set_memory_decrypted(addr & PAGE_MASK, 1UL << + get_order((addr & ~PAGE_MASK) + size)); + + } +} + #ifdef CONFIG_SMP static void __init vmware_smp_prepare_boot_cpu(void) { + set_shared_memory_decrypted(); vmware_guest_cpu_init(); native_smp_prepare_boot_cpu(); } @@ -444,6 +484,7 @@ static void __init vmware_paravirt_ops_setup(void) vmware_cpu_down_prepare) < 0) pr_err("vmware_guest: Failed to install cpu hotplug callbacks\n"); #else + set_shared_memory_decrypted(); vmware_guest_cpu_init(); #endif } --=20 2.43.7