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kvm tools: Warn if guest RAM size exceeds host RAM size

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Guest memory size that's larger than host physical RAM can cause swap deaths on
the host so warn the user about it.

Cc: Asias He <asias.hejun@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Prasad Joshi <prasadjoshi124@gmail.com>
Cc: Sasha Levin <levinsasha928@gmail.com>
Suggested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Pekka Enberg
2015-06-01 16:39:43 +01:00
committed by Will Deacon
parent 18bd8c3bd2
commit 60ded00304
1 changed files with 16 additions and 7 deletions
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kvm-run.c
+16 -7
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@@ -213,6 +213,18 @@ static void kernel_usage_with_options(void)
fprintf(stderr, "\nPlease see 'kvm run --help' for more options.\n\n");
}
static u64 host_ram_size(void)
{
long page_size;
long nr_pages;
nr_pages = sysconf(_SC_PHYS_PAGES);
page_size = sysconf(_SC_PAGE_SIZE);
return (nr_pages * page_size) >> MB_SHIFT;
}
/*
* If user didn't specify how much memory it wants to allocate for the guest,
* avoid filling the whole host RAM.
@@ -222,17 +234,11 @@ static void kernel_usage_with_options(void)
static u64 get_ram_size(int nr_cpus)
{
long available;
long page_size;
long nr_pages;
long ram_size;
ram_size = 64 * (nr_cpus + 3);
nr_pages = sysconf(_SC_PHYS_PAGES);
page_size = sysconf(_SC_PAGE_SIZE);
available = ((nr_pages * page_size) >> MB_SHIFT) * RAM_SIZE_RATIO;
available = host_ram_size() * RAM_SIZE_RATIO;
if (ram_size > available)
ram_size = available;
@@ -364,6 +370,9 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
if (ram_size < MIN_RAM_SIZE_MB)
die("Not enough memory specified: %lluMB (min %lluMB)", ram_size, MIN_RAM_SIZE_MB);
if (ram_size > host_ram_size())
warning("Guest memory size %lluMB exceeds host physical RAM size %lluMB", ram_size, host_ram_size());
ram_size <<= MB_SHIFT;
if (!kvm_dev)