search for: get_zeroed_page

From: Xiao Guangrong <xiaoguangrong at cn.fujitsu.com> We can use alloc_page() instead of get_zeroed_page() and virt_to_page() Signed-off-by: Xiao Guangrong <xiaoguangrong at cn.fujitsu.com> Signed-off-by: Rusty Russell <rusty at rustcorp.com.au> --- drivers/lguest/core.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/lguest/core.c b/drivers/lguest/cor...

From: Xiao Guangrong <xiaoguangrong at cn.fujitsu.com> We can use alloc_page() instead of get_zeroed_page() and virt_to_page() Signed-off-by: Xiao Guangrong <xiaoguangrong at cn.fujitsu.com> Signed-off-by: Rusty Russell <rusty at rustcorp.com.au> --- drivers/lguest/core.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/lguest/core.c b/drivers/lguest/cor...

...long addr); > +#else > +static inline struct page *alloc_transhugepage(struct vm_area_struct *vma, > + unsigned long addr) > +{ > + return NULL; > +} > +#endif > > extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); > extern unsigned long get_zeroed_page(gfp_t gfp_mask); > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index 25d95f7b1e98..f749633ed350 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -775,6 +775,22 @@ vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf) > return __do_huge_pmd_anonymous_pag...

...static struct virtio_vsock *virtio_vsock_get(void) @@ -256,6 +257,25 @@ static int virtio_transport_send_pkt_loopback(struct virtio_vsock *vsock, return 0; } +static int fill_mergeable_rx_buff(struct virtqueue *vq) +{ + void *page = NULL; + struct scatterlist sg; + int err; + + page = (void *)get_zeroed_page(GFP_KERNEL); + if (!page) + return -ENOMEM; + + sg_init_one(&sg, page, PAGE_SIZE); + + err = virtqueue_add_inbuf(vq, &sg, 1, page, GFP_KERNEL); + if (err < 0) + free_page((unsigned long) page); + + return err; +} + static void virtio_vsock_rx_fill(struct virtio_vsock *vsock) { int...

...static struct virtio_vsock *virtio_vsock_get(void) @@ -256,6 +257,25 @@ static int virtio_transport_send_pkt_loopback(struct virtio_vsock *vsock, return 0; } +static int fill_mergeable_rx_buff(struct virtqueue *vq) +{ + void *page = NULL; + struct scatterlist sg; + int err; + + page = (void *)get_zeroed_page(GFP_KERNEL); + if (!page) + return -ENOMEM; + + sg_init_one(&sg, page, PAGE_SIZE); + + err = virtqueue_add_inbuf(vq, &sg, 1, page, GFP_KERNEL); + if (err < 0) + free_page((unsigned long) page); + + return err; +} + static void virtio_vsock_rx_fill(struct virtio_vsock *vsock) { int...

OK, here it is. Benchmarks still coming. This is against Andi's 2.6.18-rc7-git3 tree, and replaces the patches between (and not including) i386-pda-asm-offsets and i386-early-fault. One patch is identical, one is mildly modified, the rest are re-implemented but inspired by Jeremy's PDA work. Thanks, Rusty. -- Help! Save Australia from the worst of the DMCA: http://linux.org.au/law

OK, here it is. Benchmarks still coming. This is against Andi's 2.6.18-rc7-git3 tree, and replaces the patches between (and not including) i386-pda-asm-offsets and i386-early-fault. One patch is identical, one is mildly modified, the rest are re-implemented but inspired by Jeremy's PDA work. Thanks, Rusty. -- Help! Save Australia from the worst of the DMCA: http://linux.org.au/law

..._pkt_loopback(struct virtio_vsock *vsock, >> return 0; >> } >> >> +static int fill_mergeable_rx_buff(struct virtqueue *vq) >> +{ >> + void *page = NULL; >> + struct scatterlist sg; >> + int err; >> + >> + page = (void *)get_zeroed_page(GFP_KERNEL); > > > Any reason to use zeroed page? In previous version, the entire structure of virtio_vsock_pkt is preallocated in guest use kzalloc, it is a contiguous zeroed physical memory, but host only need to fill virtio_vsock_hdr size. However, in mergeable rx buffer version, we...

...;t map it in. */ + if (!(pmd_flags(gpmd) & _PAGE_PRESENT)) + return 0; + + /* Now look at the matching shadow entry. */ + spmd = spmd_addr(cpu, *spgd, vaddr); + + if (!(pmd_flags(*spmd) & _PAGE_PRESENT)) { + /* No shadow entry: allocate a new shadow PTE page. */ + unsigned long ptepage = get_zeroed_page(GFP_KERNEL); + + /* This is not really the Guest's fault, but killing it is + * simple for this corner case. */ + if (!ptepage) { + kill_guest(cpu, "out of memory allocating pte page"); + return 0; + } + + /* We check that the Guest pmd is OK. */ + check_gpmd(cpu, gpmd); + +...

...;t map it in. */ + if (!(pmd_flags(gpmd) & _PAGE_PRESENT)) + return 0; + + /* Now look at the matching shadow entry. */ + spmd = spmd_addr(cpu, *spgd, vaddr); + + if (!(pmd_flags(*spmd) & _PAGE_PRESENT)) { + /* No shadow entry: allocate a new shadow PTE page. */ + unsigned long ptepage = get_zeroed_page(GFP_KERNEL); + + /* This is not really the Guest's fault, but killing it is + * simple for this corner case. */ + if (!ptepage) { + kill_guest(cpu, "out of memory allocating pte page"); + return 0; + } + + /* We check that the Guest pmd is OK. */ + check_gpmd(cpu, gpmd); + +...

On Mon, 2007-03-05 at 13:06 +0100, Ingo Molnar wrote: > Subject: [patch] paravirt: VDSO page is essential > From: Ingo Molnar <mingo@elte.hu> > > commit 3bbf54725467d604698721384d858b5983b87e8f disables the VDSO for > CONFIG_PARAVIRT kernels. This #ifdeffery was a bad change: the VDSO is > an essential component of Linux, and this change forces all of them to > use

On Mon, 2007-03-05 at 13:06 +0100, Ingo Molnar wrote: > Subject: [patch] paravirt: VDSO page is essential > From: Ingo Molnar <mingo@elte.hu> > > commit 3bbf54725467d604698721384d858b5983b87e8f disables the VDSO for > CONFIG_PARAVIRT kernels. This #ifdeffery was a bad change: the VDSO is > an essential component of Linux, and this change forces all of them to > use

...gt; #include <asm/msr.h> @@ -45,23 +46,88 @@ void enable_sep_cpu(void) */ extern const char vsyscall_int80_start, vsyscall_int80_end; extern const char vsyscall_sysenter_start, vsyscall_sysenter_end; +static void *syscall_page; int __init sysenter_setup(void) { - void *page = (void *)get_zeroed_page(GFP_ATOMIC); - - __set_fixmap(FIX_VSYSCALL, __pa(page), PAGE_READONLY_EXEC); + syscall_page = (void *)get_zeroed_page(GFP_ATOMIC); if (!boot_cpu_has(X86_FEATURE_SEP)) { - memcpy(page, + memcpy(syscall_page, &vsyscall_int80_start, &vsyscall_int80_end - &vsyscall...

...gt; #include <asm/msr.h> @@ -45,23 +46,88 @@ void enable_sep_cpu(void) */ extern const char vsyscall_int80_start, vsyscall_int80_end; extern const char vsyscall_sysenter_start, vsyscall_sysenter_end; +static void *syscall_page; int __init sysenter_setup(void) { - void *page = (void *)get_zeroed_page(GFP_ATOMIC); - - __set_fixmap(FIX_VSYSCALL, __pa(page), PAGE_READONLY_EXEC); + syscall_page = (void *)get_zeroed_page(GFP_ATOMIC); if (!boot_cpu_has(X86_FEATURE_SEP)) { - memcpy(page, + memcpy(syscall_page, &vsyscall_int80_start, &vsyscall_int80_end - &vsyscall...

...;& fc > 0) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + switch (fc) { + case 0: + vcpu->arch.guest_gprs[0] = 3 << 28; + vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); + return 0; + case 1: /* same handling for 1 and 2 */ + case 2: + mem = get_zeroed_page(GFP_KERNEL); + if (!mem) + goto out_fail; + if (stsi((void *) mem, fc, sel1, sel2) == -ENOSYS) + goto out_mem; + break; + case 3: + if (sel1 != 2 || sel2 != 2) + goto out_fail; + mem = get_zeroed_page(GFP_KERNEL); + if (!mem) + goto out_fail; + handle_stsi_3_2_2(vcpu, (void *) mem);...

Hi Andi, Here's a couple of patches to fix up COMPAT_VDSO: The first is a straightforward implementation of Jan's original idea of relocating the VDSO to match its mapped location. Unlike Jan and Zach's version, I changed it to relocate based on the phdrs rather than the sections; the result is pleasantly compact. The second patch takes advantage of the fact that all the

Hi Andi, Here's a couple of patches to fix up COMPAT_VDSO: The first is a straightforward implementation of Jan's original idea of relocating the VDSO to match its mapped location. Unlike Jan and Zach's version, I changed it to relocate based on the phdrs rather than the sections; the result is pleasantly compact. The second patch takes advantage of the fact that all the

...epage(struct vm_area_struct *vma, + unsigned long addr); +#else +static inline struct page *alloc_transhugepage(struct vm_area_struct *vma, + unsigned long addr) +{ + return NULL; +} +#endif extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); extern unsigned long get_zeroed_page(gfp_t gfp_mask); diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 25d95f7b1e98..f749633ed350 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -775,6 +775,22 @@ vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf) return __do_huge_pmd_anonymous_page(vmf, page, gfp); } +#ifde...

...epage(struct vm_area_struct *vma, + unsigned long addr); +#else +static inline struct page *alloc_transhugepage(struct vm_area_struct *vma, + unsigned long addr) +{ + return NULL; +} +#endif extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); extern unsigned long get_zeroed_page(gfp_t gfp_mask); diff --git a/mm/huge_memory.c b/mm/huge_memory.c index a073e66d0ee2..c2c1d3e7c35f 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -765,6 +765,20 @@ vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf) return __do_huge_pmd_anonymous_page(vmf, page, gfp); } +struc...

As suggested by Andi Kleen, don't allocate a GDT page if there is already one present. Needed for CPU hotplug. Signed-off-by: Zachary Amsden <zach@vmware.com> Index: linux-2.6.14-rc1/arch/i386/kernel/smpboot.c =================================================================== --- linux-2.6.14-rc1.orig/arch/i386/kernel/smpboot.c 2005-09-20 20:38:22.000000000 -0700 +++