[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] x86/S3: Restore Xen's MSR_PAT value on S3 resume
commit 4d975798e11579fdf405b348543061129e01b0fb Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> AuthorDate: Thu Jan 5 20:42:58 2023 +0000 Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> CommitDate: Tue Jan 10 21:21:30 2023 +0000 x86/S3: Restore Xen's MSR_PAT value on S3 resume There are two paths in the trampoline, and Xen's PAT needs setting up in both, not just the boot path. Fixes: 4304ff420e51 ("x86/S3: Drop {save,restore}_rest_processor_state() completely") Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> --- xen/arch/x86/boot/wakeup.S | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/xen/arch/x86/boot/wakeup.S b/xen/arch/x86/boot/wakeup.S index c17d613b61..08447e1934 100644 --- a/xen/arch/x86/boot/wakeup.S +++ b/xen/arch/x86/boot/wakeup.S @@ -130,6 +130,11 @@ wakeup_32: and %edi, %edx wrmsr 1: + /* Set up PAT before enabling paging. */ + mov $XEN_MSR_PAT & 0xffffffff, %eax + mov $XEN_MSR_PAT >> 32, %edx + mov $MSR_IA32_CR_PAT, %ecx + wrmsr /* Set up EFER (Extended Feature Enable Register). */ movl $MSR_EFER,%ecx -- generated by git-patchbot for /home/xen/git/xen.git#master
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