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-rw-r--r--arch/x86/xen/enlighten.c52
-rw-r--r--arch/x86/xen/mmu.c74
-rw-r--r--arch/x86/xen/p2m.c2
-rw-r--r--arch/x86/xen/time.c6
4 files changed, 71 insertions, 63 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 880862c7d..760789ae8 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -75,7 +75,6 @@
#include <asm/mach_traps.h>
#include <asm/mwait.h>
#include <asm/pci_x86.h>
-#include <asm/pat.h>
#include <asm/cpu.h>
#ifdef CONFIG_ACPI
@@ -1093,6 +1092,26 @@ static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
return ret;
}
+static u64 xen_read_msr(unsigned int msr)
+{
+ /*
+ * This will silently swallow a #GP from RDMSR. It may be worth
+ * changing that.
+ */
+ int err;
+
+ return xen_read_msr_safe(msr, &err);
+}
+
+static void xen_write_msr(unsigned int msr, unsigned low, unsigned high)
+{
+ /*
+ * This will silently swallow a #GP from WRMSR. It may be worth
+ * changing that.
+ */
+ xen_write_msr_safe(msr, low, high);
+}
+
void xen_setup_shared_info(void)
{
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
@@ -1187,13 +1206,11 @@ static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
}
static const struct pv_info xen_info __initconst = {
- .paravirt_enabled = 1,
.shared_kernel_pmd = 0,
#ifdef CONFIG_X86_64
.extra_user_64bit_cs = FLAT_USER_CS64,
#endif
- .features = 0,
.name = "Xen",
};
@@ -1223,8 +1240,11 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.wbinvd = native_wbinvd,
- .read_msr = xen_read_msr_safe,
- .write_msr = xen_write_msr_safe,
+ .read_msr = xen_read_msr,
+ .write_msr = xen_write_msr,
+
+ .read_msr_safe = xen_read_msr_safe,
+ .write_msr_safe = xen_write_msr_safe,
.read_pmc = xen_read_pmc,
@@ -1469,10 +1489,10 @@ static void xen_pvh_set_cr_flags(int cpu)
* For BSP, PSE PGE are set in probe_page_size_mask(), for APs
* set them here. For all, OSFXSR OSXMMEXCPT are set in fpu__init_cpu().
*/
- if (cpu_has_pse)
+ if (boot_cpu_has(X86_FEATURE_PSE))
cr4_set_bits_and_update_boot(X86_CR4_PSE);
- if (cpu_has_pge)
+ if (boot_cpu_has(X86_FEATURE_PGE))
cr4_set_bits_and_update_boot(X86_CR4_PGE);
}
@@ -1506,12 +1526,16 @@ static void __init xen_pvh_early_guest_init(void)
}
#endif /* CONFIG_XEN_PVH */
+static void __init xen_dom0_set_legacy_features(void)
+{
+ x86_platform.legacy.rtc = 1;
+}
+
/* First C function to be called on Xen boot */
asmlinkage __visible void __init xen_start_kernel(void)
{
struct physdev_set_iopl set_iopl;
unsigned long initrd_start = 0;
- u64 pat;
int rc;
if (!xen_start_info)
@@ -1527,8 +1551,6 @@ asmlinkage __visible void __init xen_start_kernel(void)
/* Install Xen paravirt ops */
pv_info = xen_info;
- if (xen_initial_domain())
- pv_info.features |= PV_SUPPORTED_RTC;
pv_init_ops = xen_init_ops;
if (!xen_pvh_domain()) {
pv_cpu_ops = xen_cpu_ops;
@@ -1618,13 +1640,6 @@ asmlinkage __visible void __init xen_start_kernel(void)
xen_start_info->nr_pages);
xen_reserve_special_pages();
- /*
- * Modify the cache mode translation tables to match Xen's PAT
- * configuration.
- */
- rdmsrl(MSR_IA32_CR_PAT, pat);
- pat_init_cache_modes(pat);
-
/* keep using Xen gdt for now; no urgent need to change it */
#ifdef CONFIG_X86_32
@@ -1670,6 +1685,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
boot_params.hdr.ramdisk_image = initrd_start;
boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line);
+ boot_params.hdr.hardware_subarch = X86_SUBARCH_XEN;
if (!xen_initial_domain()) {
add_preferred_console("xenboot", 0, NULL);
@@ -1687,6 +1703,8 @@ asmlinkage __visible void __init xen_start_kernel(void)
.u.firmware_info.type = XEN_FW_KBD_SHIFT_FLAGS,
};
+ x86_platform.set_legacy_features =
+ xen_dom0_set_legacy_features;
xen_init_vga(info, xen_start_info->console.dom0.info_size);
xen_start_info->console.domU.mfn = 0;
xen_start_info->console.domU.evtchn = 0;
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 478a2de54..67433714b 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1113,7 +1113,7 @@ static void __init xen_cleanhighmap(unsigned long vaddr,
/* NOTE: The loop is more greedy than the cleanup_highmap variant.
* We include the PMD passed in on _both_ boundaries. */
- for (; vaddr <= vaddr_end && (pmd < (level2_kernel_pgt + PAGE_SIZE));
+ for (; vaddr <= vaddr_end && (pmd < (level2_kernel_pgt + PTRS_PER_PMD));
pmd++, vaddr += PMD_SIZE) {
if (pmd_none(*pmd))
continue;
@@ -1551,41 +1551,6 @@ static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
#endif
}
-#ifdef CONFIG_X86_32
-static pte_t __init mask_rw_pte(pte_t *ptep, pte_t pte)
-{
- /* If there's an existing pte, then don't allow _PAGE_RW to be set */
- if (pte_val_ma(*ptep) & _PAGE_PRESENT)
- pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &
- pte_val_ma(pte));
-
- return pte;
-}
-#else /* CONFIG_X86_64 */
-static pte_t __init mask_rw_pte(pte_t *ptep, pte_t pte)
-{
- unsigned long pfn;
-
- if (xen_feature(XENFEAT_writable_page_tables) ||
- xen_feature(XENFEAT_auto_translated_physmap) ||
- xen_start_info->mfn_list >= __START_KERNEL_map)
- return pte;
-
- /*
- * Pages belonging to the initial p2m list mapped outside the default
- * address range must be mapped read-only. This region contains the
- * page tables for mapping the p2m list, too, and page tables MUST be
- * mapped read-only.
- */
- pfn = pte_pfn(pte);
- if (pfn >= xen_start_info->first_p2m_pfn &&
- pfn < xen_start_info->first_p2m_pfn + xen_start_info->nr_p2m_frames)
- pte = __pte_ma(pte_val_ma(pte) & ~_PAGE_RW);
-
- return pte;
-}
-#endif /* CONFIG_X86_64 */
-
/*
* Init-time set_pte while constructing initial pagetables, which
* doesn't allow RO page table pages to be remapped RW.
@@ -1600,13 +1565,37 @@ static pte_t __init mask_rw_pte(pte_t *ptep, pte_t pte)
* so always write the PTE directly and rely on Xen trapping and
* emulating any updates as necessary.
*/
-static void __init xen_set_pte_init(pte_t *ptep, pte_t pte)
+__visible pte_t xen_make_pte_init(pteval_t pte)
{
- if (pte_mfn(pte) != INVALID_P2M_ENTRY)
- pte = mask_rw_pte(ptep, pte);
- else
- pte = __pte_ma(0);
+#ifdef CONFIG_X86_64
+ unsigned long pfn;
+
+ /*
+ * Pages belonging to the initial p2m list mapped outside the default
+ * address range must be mapped read-only. This region contains the
+ * page tables for mapping the p2m list, too, and page tables MUST be
+ * mapped read-only.
+ */
+ pfn = (pte & PTE_PFN_MASK) >> PAGE_SHIFT;
+ if (xen_start_info->mfn_list < __START_KERNEL_map &&
+ pfn >= xen_start_info->first_p2m_pfn &&
+ pfn < xen_start_info->first_p2m_pfn + xen_start_info->nr_p2m_frames)
+ pte &= ~_PAGE_RW;
+#endif
+ pte = pte_pfn_to_mfn(pte);
+ return native_make_pte(pte);
+}
+PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte_init);
+static void __init xen_set_pte_init(pte_t *ptep, pte_t pte)
+{
+#ifdef CONFIG_X86_32
+ /* If there's an existing pte, then don't allow _PAGE_RW to be set */
+ if (pte_mfn(pte) != INVALID_P2M_ENTRY
+ && pte_val_ma(*ptep) & _PAGE_PRESENT)
+ pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &
+ pte_val_ma(pte));
+#endif
native_set_pte(ptep, pte);
}
@@ -2407,6 +2396,7 @@ static void __init xen_post_allocator_init(void)
pv_mmu_ops.alloc_pud = xen_alloc_pud;
pv_mmu_ops.release_pud = xen_release_pud;
#endif
+ pv_mmu_ops.make_pte = PV_CALLEE_SAVE(xen_make_pte);
#ifdef CONFIG_X86_64
pv_mmu_ops.write_cr3 = &xen_write_cr3;
@@ -2455,7 +2445,7 @@ static const struct pv_mmu_ops xen_mmu_ops __initconst = {
.pte_val = PV_CALLEE_SAVE(xen_pte_val),
.pgd_val = PV_CALLEE_SAVE(xen_pgd_val),
- .make_pte = PV_CALLEE_SAVE(xen_make_pte),
+ .make_pte = PV_CALLEE_SAVE(xen_make_pte_init),
.make_pgd = PV_CALLEE_SAVE(xen_make_pgd),
#ifdef CONFIG_X86_PAE
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index cab9f766b..dd2a49a8a 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -182,7 +182,7 @@ static void * __ref alloc_p2m_page(void)
if (unlikely(!slab_is_available()))
return alloc_bootmem_align(PAGE_SIZE, PAGE_SIZE);
- return (void *)__get_free_page(GFP_KERNEL | __GFP_REPEAT);
+ return (void *)__get_free_page(GFP_KERNEL);
}
static void __ref free_p2m_page(void *p)
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index a0a4e554c..6deba5bc7 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -290,11 +290,11 @@ static int xen_vcpuop_set_next_event(unsigned long delta,
WARN_ON(!clockevent_state_oneshot(evt));
single.timeout_abs_ns = get_abs_timeout(delta);
- single.flags = VCPU_SSHOTTMR_future;
+ /* Get an event anyway, even if the timeout is already expired */
+ single.flags = 0;
ret = HYPERVISOR_vcpu_op(VCPUOP_set_singleshot_timer, cpu, &single);
-
- BUG_ON(ret != 0 && ret != -ETIME);
+ BUG_ON(ret != 0);
return ret;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-02 18:58:23 +0000