mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-12 13:55:32 +00:00
Code Issues Releases Wiki Activity

x86/pm: Save the MSR validity status at context setup

Browse source 
commit 73924ec4d5 upstream.

The mechanism to save/restore MSRs during S3 suspend/resume checks for
the MSR validity during suspend, and only restores the MSR if its a
valid MSR.  This is not optimal, as an invalid MSR will unnecessarily
throw an exception for every suspend cycle.  The more invalid MSRs,
higher the impact will be.

Check and save the MSR validity at setup.  This ensures that only valid
MSRs that are guaranteed to not throw an exception will be attempted
during suspend.

Fixes: 7a9c2dd08e ("x86/pm: Introduce quirk framework to save/restore extra MSR registers around suspend/resume")
Suggested-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Borislav Petkov <bp@suse.de>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pawan Gupta 2022-04-04 17:34:19 -07:00 committed by Greg Kroah-Hartman
parent 5e16dc5378
commit ef46005631
1 changed files with 5 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
arch/x86/power/cpu.c
View file

@ -41,7 +41,8 @@ static void msr_save_context(struct saved_context *ctxt)
struct saved_msr *end = msr + ctxt->saved_msrs.num;
while (msr < end) {
msr->valid = !rdmsrl_safe(msr->info.msr_no, &msr->info.reg.q);
if (msr->valid)
rdmsrl(msr->info.msr_no, msr->info.reg.q);
msr++;
}
}
@ -426,8 +427,10 @@ static int msr_build_context(const u32 *msr_id, const int num)
}
for (i = saved_msrs->num, j = 0; i < total_num; i++, j++) {
u64 dummy;
msr_array[i].info.msr_no = msr_id[j];
msr_array[i].valid = false;
msr_array[i].valid = !rdmsrl_safe(msr_id[j], &dummy);
msr_array[i].info.reg.q = 0;
}
saved_msrs->num = total_num;