x86 boot_param: add page_offset_base

rhel 7.5 and later kernels have a page_offset_base that is not always 0xffff880000000000, we need to know where it is Change-Id: I10b5bf2e054c221aa3f899b34fd47326382cef0b
stlankes · Dec 11, 2019 · 7612483 · 7612483
1 parent 8fe8607
commit 7612483
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diff --git a/cokernel/smp/x86_64/bootparam.h b/cokernel/smp/x86_64/bootparam.h
@@ -113,6 +113,7 @@ struct smp_boot_param {
 	unsigned long multi_intr_mode_addr;
 	unsigned long mckernel_do_futex;
 	unsigned long linux_kernel_pgt_phys;
+	unsigned long page_offset_base;
 
 	unsigned long dma_address;
 	unsigned long ident_table;

diff --git a/cokernel/smp/x86_64/setup.c b/cokernel/smp/x86_64/setup.c
@@ -26,6 +26,7 @@ extern void init_boot_processor_local(void);
 extern struct ihk_kmsg_buf *kmsg_buf;
 extern int no_turbo;
 
+unsigned long linux_page_offset_base;
 unsigned long x86_kernel_phys_base;
 unsigned long ap_trampoline = 0;
 unsigned int ihk_ikc_irq = 0;
@@ -49,6 +50,7 @@ void arch_start(unsigned long param_addr, unsigned long phys_address,
 	ihk_ikc_irq = boot_param->ihk_ikc_irq;
 	bootstrap_mem_end = boot_param->bootstrap_mem_end;
 	boot_param_size = boot_param->param_size;
+	linux_page_offset_base = boot_param->page_offset_base;
 
 	/* Set up initial (temporary) stack */
 	asm volatile("movq %0, %%rsp" : : "r" (stack + sizeof(stack)));

diff --git a/linux/driver/smp/arch/x86_64/smp-arch-driver.c b/linux/driver/smp/arch/x86_64/smp-arch-driver.c
@@ -418,6 +418,7 @@ void smp_ihk_setup_trampoline(void *priv)
 	os->param->ihk_ikc_irq = ihk_smp_irq;
 #endif // IHK_IKC_USE_LINUX_WORK_IRQ
 
+	os->param->page_offset_base = page_offset_base;
 	os->param->linux_kernel_pgt_phys = __pa(&_init_level4_pgt[0]);
 	dprintf("%s: Linux kernel init PT: 0x%lx, phys: 0x%lx\n", __func__,
 		&_init_level4_pgt[0], os->param->linux_kernel_pgt_phys);