On 05/08/2012 02:24 PM, Gleb Natapov wrote:
> Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
Please describe the regression you're testing for. We could even link
it to the fix with the commit hash.
> void vfree(void *mem)
> {
> unsigned long size = ((unsigned long *)mem)[-1];
> diff --git a/lib/x86/vm.h b/lib/x86/vm.h
> index 71ab4a8..ff4842f 100644
> --- a/lib/x86/vm.h
> +++ b/lib/x86/vm.h
> @@ -22,6 +22,7 @@ void vfree(void *mem);
> void *vmap(unsigned long long phys, unsigned long size);
> void *alloc_vpage(void);
> void *alloc_vpages(ulong nr);
> +unsigned long virt_to_phys_cr3(void *mem);
uint64_t.
> @@ -0,0 +1,98 @@
> +/*
> + * Async PF test. For the test to actually do anywathing it ineeds to be started
> + * in memory cgroup with 512M of memory and with more then 1G memory provided
> + * to the guest.
> + */
Please include instructions or a script on how to do that.
Alterative ways of doing this:
- file-backed memory using FUSE to control paging
- add madvise(MADV_DONTNEED) support to testdev, and have the guest
trigger page-in itself.
I'm not asking to change this test, just providing ideas for the future
in case fine-grained control is needed. It also doesn't thrash the disk.
> +#include "x86/msr.h"
> +#include "x86/processor.h"
> +#include "x86/apic-defs.h"
> +#include "x86/apic.h"
> +#include "x86/desc.h"
> +#include "x86/isr.h"
> +#include "x86/vm.h"
> +
> +#include "libcflat.h"
> +#include <stdint.h>
> +
> +#define KVM_PV_REASON_PAGE_NOT_PRESENT 1
> +#define KVM_PV_REASON_PAGE_READY 2
> +
> +#define MSR_KVM_ASYNC_PF_EN 0x4b564d02
> +
> +#define KVM_ASYNC_PF_ENABLED (1 << 0)
> +#define KVM_ASYNC_PF_SEND_ALWAYS (1 << 1)
> +
> +volatile uint32_t apf_reason __attribute__((aligned(64)));
> +char *buf;
> +volatile uint64_t i;
> +volatile unsigned long phys;
uint64_t.
> +
> +static void pf_isr(struct ex_regs *r)
> +{
> + void* virt = (void*)((ulong)(buf+i) & ~4095ul);
> +
> + switch (get_apf_reason()) {
> + case 0:
default:
> + printf("unexpected #PF at %p\n", read_cr2());
> + fail = true;
> + break;
> + case KVM_PV_REASON_PAGE_NOT_PRESENT:
> + phys = virt_to_phys_cr3(virt);
> + install_pte(phys_to_virt(read_cr3()), 1, virt, phys, 0);
> + write_cr3(read_cr3());
What's the point of these?
> + printf("Got not present #PF token %x virt addr %p phys addr %p\n", read_cr2(), virt, phys);
> + while(phys) {
> + irq_enable();
> + halt();
Racy... you need safe_halt() here.
> + irq_disable();
> + }
> + break;
> + case KVM_PV_REASON_PAGE_READY:
> + printf("Got present #PF token %x\n", read_cr2());
> + if ((uint32_t)read_cr2() == ~0)
> + break;
> + install_pte(phys_to_virt(read_cr3()), 1, virt, phys | PTE_PRESENT | PTE_WRITE, 0);
> + write_cr3(read_cr3());
> + phys = 0;
> + break;
> + }
> +}
> +
>
--
error compiling committee.c: too many arguments to function
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