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Subject[PATCH] PVH: vcpu info placement, load selectors, and remove debug printk.
Date
This patch addresses 3 things:
- Resolve vcpu info placement fixme.
- Load DS/SS/CS selectors for PVH after switching to new gdt.
- Remove printk in case of failure to map pnfs in p2m. This because qemu
has lot of benign failures when mapping HVM pages.

Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
---
arch/x86/xen/enlighten.c | 22 ++++++++++++++++++----
arch/x86/xen/mmu.c | 3 ---
2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index a7ee39f..6ff30d8 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1083,14 +1083,12 @@ void xen_setup_shared_info(void)
HYPERVISOR_shared_info =
(struct shared_info *)__va(xen_start_info->shared_info);

- /* PVH TBD/FIXME: vcpu info placement in phase 2 */
- if (xen_pvh_domain())
- return;
-
#ifndef CONFIG_SMP
/* In UP this is as good a place as any to set up shared info */
xen_setup_vcpu_info_placement();
#endif
+ if (xen_pvh_domain())
+ return;

xen_setup_mfn_list_list();
}
@@ -1103,6 +1101,10 @@ void xen_setup_vcpu_info_placement(void)
for_each_possible_cpu(cpu)
xen_vcpu_setup(cpu);

+ /* PVH always uses native IRQ ops */
+ if (xen_pvh_domain())
+ return;
+
/* xen_vcpu_setup managed to place the vcpu_info within the
percpu area for all cpus, so make use of it */
if (have_vcpu_info_placement) {
@@ -1327,6 +1329,18 @@ static void __init xen_setup_stackprotector(void)
/* PVH TBD/FIXME: investigate setup_stack_canary_segment */
if (xen_feature(XENFEAT_auto_translated_physmap)) {
switch_to_new_gdt(0);
+
+ /* xen started us with null selectors. load them now */
+ __asm__ __volatile__ (
+ "movl %0,%%ds\n"
+ "movl %0,%%ss\n"
+ "pushq %%rax\n"
+ "leaq 1f(%%rip),%%rax\n"
+ "pushq %%rax\n"
+ "retfq\n"
+ "1:\n"
+ : : "r" (__KERNEL_DS), "a" (__KERNEL_CS) : "memory");
+
return;
}
pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry_boot;
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 31cc1ef..c104895 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -2527,9 +2527,6 @@ static int pvh_add_to_xen_p2m(unsigned long lpfn, unsigned long fgmfn,
set_xen_guest_handle(xatp.errs, &err);

rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
- if (rc || err)
- pr_warn("d0: Failed to map pfn (0x%lx) to mfn (0x%lx) rc:%d:%d\n",
- lpfn, fgmfn, rc, err);
return rc;
}

--
1.7.2.3


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