diff options
Diffstat (limited to 'arch/x86')
-rw-r--r-- | arch/x86/include/asm/lguest.h | 7 | ||||
-rw-r--r-- | arch/x86/include/asm/lguest_hcall.h | 3 | ||||
-rw-r--r-- | arch/x86/lguest/Kconfig | 1 | ||||
-rw-r--r-- | arch/x86/lguest/boot.c | 71 |
4 files changed, 74 insertions, 8 deletions
diff --git a/arch/x86/include/asm/lguest.h b/arch/x86/include/asm/lguest.h index 1caf576..313389c 100644 --- a/arch/x86/include/asm/lguest.h +++ b/arch/x86/include/asm/lguest.h @@ -17,8 +17,13 @@ /* Pages for switcher itself, then two pages per cpu */ #define TOTAL_SWITCHER_PAGES (SHARED_SWITCHER_PAGES + 2 * nr_cpu_ids) -/* We map at -4M for ease of mapping into the guest (one PTE page). */ +/* We map at -4M (-2M when PAE is activated) for ease of mapping + * into the guest (one PTE page). */ +#ifdef CONFIG_X86_PAE +#define SWITCHER_ADDR 0xFFE00000 +#else #define SWITCHER_ADDR 0xFFC00000 +#endif /* Found in switcher.S */ extern unsigned long default_idt_entries[]; diff --git a/arch/x86/include/asm/lguest_hcall.h b/arch/x86/include/asm/lguest_hcall.h index b14b355..d31c4a6 100644 --- a/arch/x86/include/asm/lguest_hcall.h +++ b/arch/x86/include/asm/lguest_hcall.h @@ -12,6 +12,7 @@ #define LHCALL_TS 8 #define LHCALL_SET_CLOCKEVENT 9 #define LHCALL_HALT 10 +#define LHCALL_SET_PMD 13 #define LHCALL_SET_PTE 14 #define LHCALL_SET_PGD 15 #define LHCALL_LOAD_TLS 16 @@ -33,7 +34,7 @@ * operations? There are two ways: the direct way is to make a "hypercall", * to make requests of the Host Itself. * - * We use the KVM hypercall mechanism. Eighteen hypercalls are + * We use the KVM hypercall mechanism. Seventeen hypercalls are * available: the hypercall number is put in the %eax register, and the * arguments (when required) are placed in %ebx, %ecx, %edx and %esi. * If a return value makes sense, it's returned in %eax. diff --git a/arch/x86/lguest/Kconfig b/arch/x86/lguest/Kconfig index 8dab8f7..3871804 100644 --- a/arch/x86/lguest/Kconfig +++ b/arch/x86/lguest/Kconfig @@ -2,7 +2,6 @@ config LGUEST_GUEST bool "Lguest guest support" select PARAVIRT depends on X86_32 - depends on !X86_PAE select VIRTIO select VIRTIO_RING select VIRTIO_CONSOLE diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c index d12f554..7bc65f0 100644 --- a/arch/x86/lguest/boot.c +++ b/arch/x86/lguest/boot.c @@ -167,6 +167,7 @@ static void lazy_hcall3(unsigned long call, async_hcall(call, arg1, arg2, arg3, 0); } +#ifdef CONFIG_X86_PAE static void lazy_hcall4(unsigned long call, unsigned long arg1, unsigned long arg2, @@ -178,6 +179,7 @@ static void lazy_hcall4(unsigned long call, else async_hcall(call, arg1, arg2, arg3, arg4); } +#endif /* When lazy mode is turned off reset the per-cpu lazy mode variable and then * issue the do-nothing hypercall to flush any stored calls. */ @@ -380,8 +382,8 @@ static void lguest_cpuid(unsigned int *ax, unsigned int *bx, case 1: /* Basic feature request. */ /* We only allow kernel to see SSE3, CMPXCHG16B and SSSE3 */ *cx &= 0x00002201; - /* SSE, SSE2, FXSR, MMX, CMOV, CMPXCHG8B, TSC, FPU. */ - *dx &= 0x07808111; + /* SSE, SSE2, FXSR, MMX, CMOV, CMPXCHG8B, TSC, FPU, PAE. */ + *dx &= 0x07808151; /* The Host can do a nice optimization if it knows that the * kernel mappings (addresses above 0xC0000000 or whatever * PAGE_OFFSET is set to) haven't changed. But Linux calls @@ -400,6 +402,11 @@ static void lguest_cpuid(unsigned int *ax, unsigned int *bx, if (*ax > 0x80000008) *ax = 0x80000008; break; + case 0x80000001: + /* Here we should fix nx cap depending on host. */ + /* For this version of PAE, we just clear NX bit. */ + *dx &= ~(1 << 20); + break; } } @@ -533,7 +540,12 @@ static void lguest_write_cr4(unsigned long val) static void lguest_pte_update(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { +#ifdef CONFIG_X86_PAE + lazy_hcall4(LHCALL_SET_PTE, __pa(mm->pgd), addr, + ptep->pte_low, ptep->pte_high); +#else lazy_hcall3(LHCALL_SET_PTE, __pa(mm->pgd), addr, ptep->pte_low); +#endif } static void lguest_set_pte_at(struct mm_struct *mm, unsigned long addr, @@ -543,15 +555,37 @@ static void lguest_set_pte_at(struct mm_struct *mm, unsigned long addr, lguest_pte_update(mm, addr, ptep); } -/* The Guest calls this to set a top-level entry. Again, we set the entry then - * tell the Host which top-level page we changed, and the index of the entry we - * changed. */ +/* The Guest calls lguest_set_pud to set a top-level entry and lguest_set_pmd + * to set a middle-level entry when PAE is activated. + * Again, we set the entry then tell the Host which page we changed, + * and the index of the entry we changed. */ +#ifdef CONFIG_X86_PAE +static void lguest_set_pud(pud_t *pudp, pud_t pudval) +{ + native_set_pud(pudp, pudval); + + /* 32 bytes aligned pdpt address and the index. */ + lazy_hcall2(LHCALL_SET_PGD, __pa(pudp) & 0xFFFFFFE0, + (__pa(pudp) & 0x1F) / sizeof(pud_t)); +} + +static void lguest_set_pmd(pmd_t *pmdp, pmd_t pmdval) +{ + native_set_pmd(pmdp, pmdval); + lazy_hcall2(LHCALL_SET_PMD, __pa(pmdp) & PAGE_MASK, + (__pa(pmdp) & (PAGE_SIZE - 1)) / sizeof(pmd_t)); +} +#else + +/* The Guest calls lguest_set_pmd to set a top-level entry when PAE is not + * activated. */ static void lguest_set_pmd(pmd_t *pmdp, pmd_t pmdval) { native_set_pmd(pmdp, pmdval); lazy_hcall2(LHCALL_SET_PGD, __pa(pmdp) & PAGE_MASK, (__pa(pmdp) & (PAGE_SIZE - 1)) / sizeof(pmd_t)); } +#endif /* There are a couple of legacy places where the kernel sets a PTE, but we * don't know the top level any more. This is useless for us, since we don't @@ -569,6 +603,26 @@ static void lguest_set_pte(pte_t *ptep, pte_t pteval) lazy_hcall1(LHCALL_FLUSH_TLB, 1); } +#ifdef CONFIG_X86_PAE +static void lguest_set_pte_atomic(pte_t *ptep, pte_t pte) +{ + native_set_pte_atomic(ptep, pte); + if (cr3_changed) + lazy_hcall1(LHCALL_FLUSH_TLB, 1); +} + +void lguest_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) +{ + native_pte_clear(mm, addr, ptep); + lguest_pte_update(mm, addr, ptep); +} + +void lguest_pmd_clear(pmd_t *pmdp) +{ + lguest_set_pmd(pmdp, __pmd(0)); +} +#endif + /* Unfortunately for Lguest, the pv_mmu_ops for page tables were based on * native page table operations. On native hardware you can set a new page * table entry whenever you want, but if you want to remove one you have to do @@ -1035,6 +1089,7 @@ __init void lguest_init(void) pv_info.name = "lguest"; pv_info.paravirt_enabled = 1; pv_info.kernel_rpl = 1; + pv_info.shared_kernel_pmd = 1; /* We set up all the lguest overrides for sensitive operations. These * are detailed with the operations themselves. */ @@ -1080,6 +1135,12 @@ __init void lguest_init(void) pv_mmu_ops.set_pte = lguest_set_pte; pv_mmu_ops.set_pte_at = lguest_set_pte_at; pv_mmu_ops.set_pmd = lguest_set_pmd; +#ifdef CONFIG_X86_PAE + pv_mmu_ops.set_pte_atomic = lguest_set_pte_atomic; + pv_mmu_ops.pte_clear = lguest_pte_clear; + pv_mmu_ops.pmd_clear = lguest_pmd_clear; + pv_mmu_ops.set_pud = lguest_set_pud; +#endif pv_mmu_ops.read_cr2 = lguest_read_cr2; pv_mmu_ops.read_cr3 = lguest_read_cr3; pv_mmu_ops.lazy_mode.enter = paravirt_enter_lazy_mmu; |