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Re: [Qemu-devel] [PATCH V4 2/5] xen: Introduce xen_modified_memory.
From: |
Stefano Stabellini |
Subject: |
Re: [Qemu-devel] [PATCH V4 2/5] xen: Introduce xen_modified_memory. |
Date: |
Mon, 1 Oct 2012 11:32:18 +0100 |
User-agent: |
Alpine 2.02 (DEB 1266 2009-07-14) |
On Thu, 27 Sep 2012, Anthony PERARD wrote:
> This function is to be used during live migration. Every write access to the
> guest memory should call this funcion so the Xen tools knows which pages are
> dirty.
>
> Signed-off-by: Anthony PERARD <address@hidden>
Acked-by: Stefano Stabellini <address@hidden>
> hw/xen.h | 1 +
> xen-all.c | 21 +++++++++++++++++++++
> xen-stub.c | 4 ++++
> 3 files changed, 26 insertions(+)
>
> diff --git a/hw/xen.h b/hw/xen.h
> index e5926b7..d14e92d 100644
> --- a/hw/xen.h
> +++ b/hw/xen.h
> @@ -48,6 +48,7 @@ void xenstore_store_pv_console_info(int i, struct
> CharDriverState *chr);
> struct MemoryRegion;
> void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size,
> struct MemoryRegion *mr);
> +void xen_modified_memory(ram_addr_t start, ram_addr_t length);
> #endif
>
> struct MemoryRegion;
> diff --git a/xen-all.c b/xen-all.c
> index f75ae9f..b11542c 100644
> --- a/xen-all.c
> +++ b/xen-all.c
> @@ -1228,3 +1228,24 @@ void xen_shutdown_fatal_error(const char *fmt, ...)
> /* destroy the domain */
> qemu_system_shutdown_request();
> }
> +
> +void xen_modified_memory(ram_addr_t start, ram_addr_t length)
> +{
> + if (unlikely(xen_in_migration)) {
> + int rc;
> + ram_addr_t start_pfn, nb_pages;
> +
> + if (length == 0) {
> + length = TARGET_PAGE_SIZE;
> + }
> + start_pfn = start >> TARGET_PAGE_BITS;
> + nb_pages = ((start + length + TARGET_PAGE_SIZE - 1) >>
> TARGET_PAGE_BITS)
> + - start_pfn;
> + rc = xc_hvm_modified_memory(xen_xc, xen_domid, start_pfn, nb_pages);
> + if (rc) {
> + fprintf(stderr,
> + "%s failed for "RAM_ADDR_FMT" ("RAM_ADDR_FMT"): %i,
> %s\n",
> + __func__, start, nb_pages, rc, strerror(-rc));
> + }
> + }
> +}
> diff --git a/xen-stub.c b/xen-stub.c
> index 5e66ba8..9214392 100644
> --- a/xen-stub.c
> +++ b/xen-stub.c
> @@ -59,3 +59,7 @@ void xen_register_framebuffer(MemoryRegion *mr)
> void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
> {
> }
> +
> +void xen_modified_memory(ram_addr_t start, ram_addr_t length)
> +{
> +}
> --
> Anthony PERARD
>
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